Tools
All Free Tools
870 free tools · No signup, no limits, no cost.
Compare your current mortgage to a refinance offer — break-even months, monthly savings, lifetime interest cut.
Compare up to three loan offers side-by-side — true cost, effective APR, total interest.
What if my rate rises? Stress-test your mortgage at +1pp / +2pp / +3pp and find your break-point.
Full amortisation schedule with extra-payment accelerator — see months saved and interest cut.
Compare snowball vs avalanche on your real debt portfolio — months saved, interest cost, payoff order.
The canonical SaaS scoreboard — MRR, ARR, NRR, GRR, and growth rate from your four monthly movements.
Customer LTV the SaaS-canonical way — simple formula plus cohort-weighted DCF for investor-grade math.
CAC, payback months, and LTV:CAC ratio — the three numbers every SaaS investor asks for.
Net burn, runway months, cash-out date, plus cost-cut scenario — Default Alive vs Dead in one tile.
Every ad-platform performance metric from four inputs — for Google, Meta, LinkedIn, TikTok.
How much the minimum-payment trap costs you — and what 2× / 3× payments save.
Convert APR ↔ APY for any compounding frequency. The math savings accounts and lenders use.
True cost of borrowing with compounding. The loan-side companion to APR/APY.
The 500-year-old mental math shortcut every investor uses. How long does money take to double?
Pure-math salary ↔ hourly converter with work-hour and vacation toggles.
Project portfolio value from monthly contributions. The boring strategy that wins most years.
DRIP vs cash dividends side-by-side. The highest-leverage dividend habit.
Risk-per-trade math the single most important skill in active trading.
Pip value + risk-based lot size for every major forex pair.
YTM, YTC, current yield, and modified duration for any fixed-income bond.
Personal balance sheet — assets minus liabilities. Runs entirely in your browser.
How long until you can buy. FHA / Conventional / 20% scenarios computed.
After-tax value of US equity grants with ISO / NSO / RSU + AMT modelling.
Founder ownership through seed, A, B, C — dilution math the venture canon uses.
Multi-founder + multi-SAFE + priced round. The YC standard cap-table math.
Even split + US tip presets. The fastest way to settle group dinner.
Per-item split with proportional tax + tip. The "I only had a salad" calculator.
Trip fuel cost in MPG or L/100km, plus gas vs EV side-by-side.
Full road-trip budget: fuel + lodging + food + tolls. Per-traveller share included.
Target hourly rate with SE tax, benefits gap, and real billable hours baked in.
Daily clock-in/out → weekly hours + FLSA-style overtime split.
Three-point estimation with 68/95/99% confidence intervals.
Velocity-based release forecast with best/likely/worst ranges.
Markup ↔ Margin conversion + cost-plus / margin-target pricing math.
Fixed costs ÷ contribution margin — and margin-of-safety risk frame.
%Promoters − %Detractors. Plus industry benchmarks + 95% CI.
Multi-step funnel with worst-step flagged — CRO leverage finder.
Two-proportion z-test sample size with days-to-run estimate.
p-value + 95% CI + ship/no-ship verdict for finished A/B tests.
Channel ROAS + blended MER + break-even ROAS + POAS in one view.
Employer-match optimizer + IRS-limit-aware 401(k) growth projection.
Traditional vs Roth side-by-side — with side-savings credit most calculators miss.
62 vs 67 vs 70 — cumulative lifetime benefit + pairwise break-even ages.
IRS Uniform Lifetime Table + SECURE 2.0 ages — current-year + 10-year projection.
The 4% rule, refined. Plus the FIRE-number side-bar most beginners want.
DIME + 10× Income + Human Life Value — median verdict beats any single rule of thumb.
Identifies the tax-treatment gap most LTD calculators miss.
Self-fund vs traditional vs hybrid LTC — Genworth cost survey baked in.
HSA triple-tax-advantage vs FSA use-it-or-lose-it — with the receipt-strategy unlock.
Part B + IRMAA + Part D + Medigap — the full Medicare cost stack with surprise-tax surfacing.
Full BiggerPockets-style analyzer — NOI, cap rate, CoC, with 1%-rule + 50%-rule checks.
NYT-style total cost comparison with opportunity-cost-of-down-payment built in.
David Greene's capital-recycling strategy — tests whether your deal is truly "infinite return".
STR cash flow vs LTR side-by-side — with STR-specific operating cost reality.
Defer-or-pay analysis with full boot-exposure surfacing and step-up-at-death framing.
US crypto cap gains with NIIT + state tax stacking. ST vs LT bracket math.
APR→APY at any compounding frequency + gas-cost impact on net yield.
Coin growth + USD value scenarios + validator fee + US tax on rewards.
Gwei × ETH price → USD per common tx type, with L1 vs L2 split.
DCA vs lump-sum side-by-side, with crypto-specific volatility assumptions.
Amortization + DSCR check — the math lenders use on every business loan application.
8-test SBA pre-qualification screen for 7(a), 504, Express.
SDE × industry multiple with qualitative adjustments. Low / mid / high range.
The 1.25-1.45× multiplier most hiring managers underestimate.
Sole Prop vs LLC vs S-Corp vs C-Corp side-by-side with QBI + SE tax math.
2026 brackets with bracket-by-bracket breakdown + marginal vs effective rate.
ST vs LT cap gains + NIIT + state tax stacking.
529 vs taxable + state deduction + projected college cost coverage %.
CTC + ACTC + ODC with income phase-out math.
The young-professional dilemma: pay it down or invest it.
Net Present Value + decision verdict
IRR + MIRR via Newton-Raphson
Financial independence target + timeline
One-and-done FIRE milestone
Income vs expenses + years to FIRE
Purchasing power across years
Fisher equation real return
Income allocation framework
Risk-adjusted return
Pay off your mortgage faster
The 26-payment payoff hack
Home equity line of credit math
Capture every dollar of free money
The tax-arbitrage decision
The canonical SaaS health metric
Growth + margin ≥ 40 = healthy
SaaS growth efficiency multiplier
Sales efficiency for SaaS
This should have been an email
Retention matrix + heatmap
Buy/sell per asset to restore targets
Age + risk → recommended split
Max drawdown + recovery chart
Entry/stop/target → R:R + position size
Forward + reverse split impact
Renovation cost vs resale uplift
NOI / Value, commercial fundamental
Leveraged rental yield
Quick rental screening metric
Rent vs buy decision framework
Vacant units ÷ total + lost income
DIO + DSO − DPO; days cash tied up
CA − CL + current + quick ratios
Days customers take to pay
Anchor → Good/Better/Best ladder + ARR
DIME + income multiplier methods
30-year cost + BTID math
Income gap analysis
BS-Merton 1973 — call + put pricer
Δ Γ Θ ν ρ — risk-management sensitivities
Reverse BS — solve σ from market price
DCF — discount FCF at WACC + Gordon TV
WACC — blended hurdle rate for DCF
CAPM — cost of equity from β
How much house can I afford? (28/36 rule)
Year-by-year P&I schedule
PMI cost + HOPA auto-cancel timing
Gordon + 2-stage DDM — intrinsic value
Trailing + forward P/E + Fed Model
Peter Lynch's growth-adjusted P/E
FCFF + FCFE — DCF inputs
3F + 5F ROE decomposition
Book + market D/E + leverage chips
1968 bankruptcy prediction
Income options strategy
4-leg defined-risk theta strategy
Reg T + maintenance + margin call
Discount points breakeven
ARM vs fixed-rate breakeven
Itemized closing estimate
CoC + cap rate + total ROI
Buy-Rehab-Rent-Refi-Repeat strategy
70% rule + flip P&L
Month-by-month payment + interest breakdown
Compare cashback, points & miles across cards
Solve for PV, FV, PMT, N, or rate
Macaulay & modified duration
Second-order rate sensitivity
Muni vs taxable bond yield
15% discount + lookback gain
RSU / option vesting tracker
Supplemental withholding + sell-to-cover
Deduct + grow + withdraw, all tax-free
Historical success rate by rate + allocation
Overall + per-card ratio vs the 30% line
Time + interest saved from extra payments
Net housing cost + cash-on-cash return
Lower payment after a lump sum — no refinance
Rent credits, net price + the premium you pay
Points + interest carry + flip profit
Equity by year from paydown + appreciation
Rough injury-claim ranges — not legal advice
Turn a one-time IT price into a monthly OPEX financing plan
Malaysia SST at 6% · 8% · 5% · 10% — inclusive or exclusive
Employee + employer CPF by age band, ceilings, and account allocation
Gross to net after employee CPF and estimated income tax
Employee + employer statutory contributions with official band tables
Monthly tax deduction estimate with EPF, SOCSO, spouse and child reliefs
Gross to net after EPF, SOCSO, EIS and estimated PCB
Buyer's, Additional Buyer's and Seller's Stamp Duty in one tool
Max loan and price ceiling under Singapore's servicing and LTV rules
Gaji bersih after BPJS and PPh 21 (official TER tables)
Estimate HK salaries tax with allowances, MPF, progressive vs standard rate
Estimate mandatory MPF contributions — 5% each, capped
Ad valorem stamp duty (AVD Scale 2) on a property purchase
Estimate Taiwan individual income tax (綜所稅), 2024
Estimate 勞保 / 健保 / 勞退 employee monthly deductions
Estimate mainland China IIT (个人所得税) on salary
Estimate 五险一金 employee + employer monthly contributions
Convert between 170+ currencies with live exchange rates — SGD, MYR, IDR, THB and more.
Calculate your mortgage repayments for HDB, BTO and private property — SGD, MYR and more.
Calculate loan EMI and total interest
See how your money grows over time — with compound interest, CPF, and investment planning.
Calculate GST/VAT for SG, MY, ID, TH
Calculate if you are on track for retirement — with CPF projections and ASEAN retirement planning.
Convert salary between hourly, daily, monthly and annual — with Singapore CPF and income tax estimates.
Plan monthly income and expenses
Find your break-even point in units and revenue — essential for pricing, planning and startup financial decisions.
Calculate sale prices, savings and discount percentages instantly — with GST-inclusive options for Singapore.
Calculate gross profit, net profit and markup percentage — essential for pricing and business decisions.
Generate simple invoices as PDF
Calculate monthly repayments for any loan — home, car, personal or business.
Calculate Singapore (YA 2026) and Malaysia (YA 2025) personal income tax with CPF/EPF — side-by-side, with all current brackets and reliefs.
Calculate tips and split bills instantly — for restaurants, delivery and group dining.
Add or remove GST and sales tax instantly — Singapore 9%, Malaysia 8%, Thailand 7% and more.
Calculate investment returns, ROI and annualised growth rate — for stocks, ETFs and savings.
Validate IBANs with mod-97 checksum, format-as-you-type, and country breakdown.
Aerobic capacity benchmark
Riegel formula across distances
Target time → pace + splits
L/hr sweat + hydration plan
FTP + W/kg + Coggan zones
5-formula 1RM average + % table
WHtR — better than BMI
Boer + Hume + James formulas
Decay tracker + sleep cutoff
Widmark formula (educational only)
Tanaka/Fox/Gulati/Nes equations
Mifflin-St Jeor + TDEE multipliers
Karvonen HRR 5-zone method
MET-based, 35+ activities
Protein/carb/fat from goal
Predict a child's adult height from the parents
Likely conception date, fertile window + due date
WHO weight, length/height & head-circumference percentiles for ages 0–60 months
Calculate your BMI instantly using ASEAN health thresholds — metric and imperial.
Calculate your daily calorie needs in seconds — enter your details and get your maintenance calories instantly.
Calculate your ideal daily water intake based on weight, activity and climate — with ASEAN tropical heat adjustment.
Estimate your body fat percentage using the Navy method — with ASEAN-specific health ranges.
Find your ideal weight range using 5 medical formulas — with ASEAN-adjusted healthy ranges.
Calculate your pregnancy due date and current week — enter your last period or conception date.
Find the best times to wake up or go to sleep based on 90-minute sleep cycles — wake up refreshed, not groggy.
Calculate target heart rate zones
Calculate your daily protein, carbs and fat targets — based on your body, goals and activity level.
Calculate your daily calorie needs based on age, weight, height and activity level.
Calculate Unix file permissions instantly — switch between octal (755), symbolic (-rwxr-xr-x) and a visual checkbox grid. Includes special bits (setuid, setgid, sticky).
WCAG 2.1 AA/AAA accessibility
Modular typography scale
px ↔ rem ↔ em ↔ pt
Epoch ↔ ISO 8601 ↔ local time
8 CVD types — colors + images
Multi-layer shadow stacks
Draggable easing curve editor
Polygon vertex editor
View, sort, and convert CSV to JSON, SQL, XML, or Markdown
Build, describe, and test crontab schedules
Convert Markdown to a clean PDF, with LaTeX math
Encode text to HTML entities, or decode them back
Convert names between camelCase, snake_case, kebab-case & more
Build a .gitignore from your stack, OS and editor
Turn CSV or pasted data into a clean Markdown table
Unicode, UTF-8, UTF-16, Big5, GBK and GB18030 for any character
Paste JSON — get TypeScript interfaces, Python dataclasses, Go structs & Kotlin data classes
Generate QR codes for URLs, text, Wi-Fi, vCard, and more
Format, validate and minify JSON instantly — with clear error messages and line numbers.
Convert between binary, octal, decimal and hexadecimal — instantly.
Generate strong, random passwords with custom length and character rules.
Generate favicons in all sizes from any image or text — download ready-to-use ICO, PNG and SVG files.
Generate UUIDs v1/v4 and ULIDs instantly — bulk generation, multiple formats.
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes instantly — for passwords, files and data integrity.
Test and debug regular expressions in real time — with match highlighting, groups and a built-in reference.
Pick colours and convert between HEX, RGB, HSL and CMYK — with CSS snippets ready to copy.
Generate CSS gradient code visually
Build and validate cron expressions
Decode and inspect any JWT token instantly — header, payload, expiry and signature details, all in your browser.
Find your public IP address and look up any IP's location, ISP and organisation instantly.
Look up every HTTP status code instantly — with plain-English descriptions, use cases and fix tips.
Encode text or files to Base64 and decode Base64 strings — instantly, in your browser.
Convert colours between HEX, RGB, HSL and CMYK — with live preview.
Encode and decode URLs and query strings instantly — with full RFC 3986 component support.
Build structured AI prompts using CRAFT, RTF, RACE, CO-STAR, RISEN, APE — 6 industry frameworks + 30 templates + ChatGPT/Claude/Gemini-tuned output.
Type Markdown on the left, see HTML preview on the right. GitHub-flavored: headings, lists, tables, code blocks, task lists. In-browser, no signup.
Search, copy, and test regular expressions instantly.
Strip dot tricks, plus-aliases, and capitalisation to find the underlying email.
Calculate network, broadcast, host range, and subnets from CIDR or netmask.
Build and validate cron expressions with a visual editor and next-5-runs preview.
Decode browser, OS, device type, and bot signals from any User-Agent string.
Generate random MACs and look up vendor (OUI) for any MAC address.
Build the WiFi-connect string (SSID + password + security) for QR sharing.
Parse and format international phone numbers with libphonenumber. Country dropdown defaults to ASEAN.
Convert a docker run command to docker-compose.yml — handles ports, volumes, env, restart, networks.
Convert between JSON, YAML, XML, and CSV. Auto-detect input format, side-by-side editors, all client-side.
Char + pixel width vs SERP cutoff
SERP snippet length validator
Words → minutes @ 238 wpm
Score headlines 0-100
JSON-LD FAQPage for rich snippets
Generate complete meta tags for SEO, Open Graph and Twitter Cards — copy ready.
Analyse keyword density in any text — find over-optimised and under-used terms before publishing.
Convert any title or phrase into a clean URL slug — for SEO, CMS and development.
Preview Open Graph social media cards
Generate robots.txt for your website
Build an XML sitemap manually — add your URLs, set priority and change frequency, download ready for Google.
Build UTM tracking URLs for campaigns
nPr, nCr, factorial (BigInt)
Mean, SD, variance, quartiles
Standard score + percentile + p-value
CI for mean + proportion
Slope + intercept + r + R² + scatter
Days/months/years between dates
Business days with ASEAN holidays
Date arithmetic + day of week
ISO 8601 + US week numbering
HH:MM:SS arithmetic + decimal
One-sample / Welch / paired
Goodness-of-fit + independence
F-test + eta-squared
Cochran + A/B test power
ax^2+bx+c=0 real + complex
SSS/SAS/ASA/AAS/SSA
HKD → Traditional Chinese cheque format
RMB → Simplified Chinese invoice format
Bidirectional Gregorian ↔ Chinese lunar
虚岁 / 实岁 dual age
八宅命卦 + 8 directions
4-pillar birth chart + 五行 + 十神
Two birth years → 六合/三合/相冲
8 chars → 五行 distribution + 补救
Two charts → 3-axis compat
General 黄道吉日 picker
宜嫁娶 + bride/groom zodiac
宜入宅/移徙 + owner zodiac
宜开市/开张 + owner zodiac
Any date → 60甲子 stem-branch
Year → 生肖 + 干支 + 纳音
Year → 24 节气 exact dates + times
4 formats: standard / written / lunar / 干支
NTD → Traditional capital cheque format
3 formats: 一二三 / 壹贰叁 / 壹貳叁
Budget + occasion → 12 lucky amounts
Number → per-digit lucky/avoid + score
Hanzi → 5 pinyin formats + polyphone
Hanzi → ㄅㄆㄇㄈ Taiwan standard
ni3 hao3 ↔ ㄋㄧˇ ㄏㄠˇ
Per-character stroke count + stroke-order SVG
214 Kangxi radicals grouped by stroke count
天格・人格・地格・外格・总格 numerology
Curated character pool by element + stroke
1-81 数理吉凶 auspice analysis
Top 50 surnames · clan history · diaspora romanisations
80 curated 4-character idioms · pinyin · classical origin · modern usage
HSK 1-6 vocab · 25 representative words per level
Top 200 high-frequency chars · Jun Da corpus · cumulative coverage %
Hanzi → Jyutping · LSHK 1993 standard · 6 tones + IPA
Hanzi → Yale · 1970s US standard · numeric + diacritic
4 tones + neutral quiz · build tone-recognition reflexes
cn ↔ tw ↔ hk · OpenCC-powered · word-level conversion
Full-width ↔ half-width punctuation + ASCII
Top-to-bottom, right-to-left classical layout + print
8 toggleable rules · OCR/clipboard cleanup · privacy-safe
hanzi-writer-powered SVG · 9000+ chars · ARPHIC data
80 curated classical particles + function words
64 hexagrams · line patterns · trigrams · coin-cast simulation
六大茶类 · gongfu method · live countdown + audio beep
11 major festivals · Gregorian dates · traditions
Hong Kong fan scoring · base × 2^min(fan, cap) · HK/SG/MY
Full 9×10 board · 32 pieces · click-to-move · auto-notation (Chinese + WXF)
50 classic HK dim sum · Jyutping · category · price tier
10 traditional knot patterns · cultural meanings · difficulty
24 traditional colors · hex codes · cultural meanings
40+ classic 春联 by 7 themes · vertical 上下联 + 横披 · print PDF
18 numbers · homophones · luck ratings · cultural usage
18 auspicious symbols · meanings · classical origins
Digital luopan compass · 24 mountains + 8 trigrams · phone magnetometer
8-Mansion feng shui · life trigram + 8-zone home map · door direction
Bazi vs annual Tai Sui · zodiac & 5-element interaction
4-pillar 十神 breakdown · 5-category distribution · interpretation
10-year 大运 cycles · GanZhi · Ten God · 5-element
用神 (useful god) · colors + directions + industries
5 Grids · 3 Talents · 81 numerology · overall score
3-way zodiac · recommended baby zodiac years
Daily/weekly/monthly · 4 domains · lucky color/direction/number
5 regions × 3 tiers · bride price + dowry + banquet
Score & rank candidate numbers · 168/888 vs 444/514
Person-house compatibility · sunlight · 6 layout taboos
Verifies the S/T/F/G/M check-letter algorithm · browser-only
12-digit format + birth date + state code · browser-only
SG / MY / HK / TW / CN / PH / ID / TH / VN · format check
1-2 letter + 6 digit + check character · Mod 11 algorithm
1 letter + 9 digits · region + gender + checksum
18-digit ISO 7064 MOD 11-2 · region + birth + gender
6-digit postcode → District (D01-D28) + Planning Area + Region
5-digit postcode → state + postal zone (Pos Malaysia)
33 provincial-level divisions · GB/T 2260 standard
HK Island 4 + Kowloon 5 + New Territories 9 · with codes
6 special municipalities + 3 cities + 13 counties · with ID letter
Drag-and-drop tree · auto relationship labels · SVG / PNG export
6 dialects · 拼音 / 粤拼 / 闽南罗马字 / 客拼 · up to 4 generations
30 major surnames' 字辈/字派 · root-tracing + naming
yyds / 666 / 内卷 / 躺平 · 50+ terms · 2000s-2020s
70+ nouns → 量词 · 一本书 / 一只猫 / 一双鞋
GB/T 15834-2011 · auto-detect + auto-fix · ASCII → 全角
60 chengyu · pinyin + literal + English equivalent (画蛇添足 = gild the lily)
平水韵 24 + 中华新韵 14 · 古典 + 现代诗词押韵
40 首精选 · 李白 杜甫 王维 白居易 · 拼音 + 英文背景
横排 → 竖排 · 右起 / 左起 · 标点旋转 90° 可选
30 组 · 形近 + 同音 + 形音义混 + 简繁差异 · 含口诀
康熙 214 部首 · 85 精选 · 按笔画浏览
前 100 高频字 · 学中文优先顺序 · BCC 语料库
之乎者也矣焉 · 23 高频虚词 · 高考必备
~20 音节 · 4 声分类 · 起名、写诗、避免歧义
SE of mean + proportion
Cohen's d + Hedges' g
r, p-value and 95% CI from paired data
Lakh / crore ↔ million / billion ↔ 万 / 亿
Find the Gregorian dates of your Chinese lunar birthday
Live countdown to Spring Festival, Mid-Autumn and more
Check your Tai Sui relationship for the year by Chinese zodiac
Today’s 宜 / 忌, 沖煞, 建除 and more from the Chinese almanac
每日 12 時辰 (two-hour blocks) 宜 / 忌 and 吉凶
Find your 喜用神 / 忌神 from your Four Pillars
Cast your 紫微斗數 12-palace natal chart
Browse any month with lunar dates, 节气 & 宜忌
Weigh your fate by the 袁天罡 bone-weight method
A for-fun reading from a single Chinese character
Two-part allegorical sayings — setup, punchline and meaning
Common Chinese proverbs and sayings, with meanings
Auspicious greetings for New Year, weddings, birthdays and more
Search 唐詩三百首 + 千家詩 for a famous line, poet or title
Search 950+ traditional Chinese dream interpretations
Draw or look up one of the 100 Wong Tai Sin oracle lots
The 100 Guanyin lots, with poem, reading and story
Draw or look up one of the 100 Guandi oracle lots
Draw or look up one of the 100 Yuelao love lots
Convert length, weight, temperature, area, volume and speed — instantly, free.
Convert times across ASEAN and global timezones — perfect for remote teams and international meetings.
Convert between KB, MB, GB, TB
Convert speed units instantly — km/h, mph, m/s, knots, Mach and more — with a live conversion table.
Convert data storage units
Calculate the area of any shape — rectangle, circle, triangle, trapezoid and more — with formulas shown.
Convert HEX, RGB, HSL, HSB colours
Calculate percentages, discounts, tips and changes — the fastest percentage tool online.
Generate clean SVG placeholder images for mockups, prototypes and CMS templates. Customise size, colour, text — copy as raw SVG, data URI or download.
Split a PDF or extract specific pages
Rotate PDF pages with live thumbnails
Add page numbers to any PDF
Remove unwanted PDF pages
Drag thumbnails to rearrange a PDF
Strip the fingerprint your PDF leaves
Stamp every page — DRAFT, CONFIDENTIAL, your text
True redaction — bytes removed, not just covered
Shrink PDFs — lossless or aggressive
Pull every word out of a PDF
Word + character + sentence stats
Fill + save any PDF form
Remove photo metadata + GPS
Compare two PDFs line-by-line
Pull embedded images from PDFs
Pull a dominant colour palette from any image
Turn any image into text art
Resize images to exact dimensions or by percentage — free, private, no upload required.
Compress JPG, PNG and WebP images in your browser — no upload, no account, no quality loss you can see.
Convert images to Base64 strings
Convert between JPG, PNG, WebP, GIF
Merge multiple PDFs into one
Convert PDF pages to images
View and remove image EXIF metadata
Add text or image watermarks
Convert screenshots to PDF
Inspect digital signatures in PDF files — signer, certificate, signing time, cryptographic validity. All client-side.
Flesch, FK, Fog, SMOG, CL, ARI
Compare two texts and highlight the differences
Pinyin, Zhuyin, Cantonese and stroke count for rare characters
Flag common Chinese 别字 against a curated reference
Hanyu Pinyin, Wade-Giles, Tongyong and Cantonese romanization
Semantic, simplified, traditional and look-alike variants
Cangjie5 code for any character, with radical glyphs
The first + last Cangjie radical for any character
Wubi86 code for any character, simple and full
Find all valid words from any scrambled letters
Temukan semua kata valid Bahasa Indonesia dari huruf acak — kamus 46.000+ kata KBBI.
拼音查词与成语搜索 — 10万+词条，汉字与拼音双模式
Unscramble huruf menjadi kata — 49,000+ kata DBP, pengesan Kata Dasar
Convert text to any case instantly — UPPER, lower, Title, camelCase, snake_case and more.
Count words, characters, sentences and reading time — free, instant, no signup.
Remove duplicate lines from any text instantly — case-sensitive, trimmed, sorted or unsorted.
Count characters instantly for Twitter, SMS, LinkedIn and more — with live platform limit indicators.
Convert text to Morse code
Reverse text, words, lines and sentences — mirror text for creative and technical uses.
Remove extra spaces, tabs and blank lines from any text — clean messy copy-paste text instantly.
Sort lines alphabetically or by length
Find and replace text instantly — with regex support, case sensitivity and bulk replacements.
Check if a word or phrase is a palindrome
Generate placeholder text instantly — paragraphs, sentences, words or bytes.
Convert Chinese between Simplified, Traditional, Taiwan and Hong Kong variants — all 8 OpenCC modes.
Convert between Mandarin and written Cantonese (嘅、咗、喺、佢) — basic dictionary version.
Convert between Mainland Mandarin (普通话), Malaysian Mandarin (马来西亚华语) and Singaporean Mandarin (Singdarin) — with loanwords, particles, and Cantonese-influenced word order.
Translate between Standard English, Manglish (Malaysian English), and Singlish (Singaporean English) — with lah, lor, leh, makan, paiseh, kiasu, and all the rest.
Convert between Bahasa Indonesia and Bahasa Malaysia — with a False Friends panel that catches words like "pusing", "butuh", and "kereta" that mean different things in each country.
Word count, reading time, Flesch-Kincaid grade level, Gunning-Fog index, and top words — live as you type.
Interactive 8x8 board · full FIDE rules · FEN/PGN export
Algebraic ↔ Long ↔ UCI ↔ ICCF ↔ English Descriptive
50 major openings · ECO codes · main-line PGN + ideas
Wheel of names — pick a winner at random
Split a list of names into balanced random teams
Pick a random date in a range — with working-day filters
Stuck for plans? Get a weekend activity idea
Get a ready-to-go workout by equipment, time, and level
Random format-correct numbers for popular Asian lottery games — for fun only
Reduce your birth date to your life path number
Your sun sign and a for-fun horoscope for today
Match two sun signs for a for-fun compatibility score
The pop-culture personality profile for each blood type
Find an English name by gender, letter and style
Turn text into playful 火星文 and back
Type a passage and measure your CPM and accuracy
Play 成語接龍 against the tool — chain idioms by their last character
Guess the character — a collection of classic 字謎
Famous 繞口令 with pinyin and the tricky sounds
See your whole life as a grid of weeks — and download the poster
Cool Unicode fonts to copy & paste — bold, script, double-struck & more
Guess today’s four-character Chinese idiom in 6 tries
Turn a name into a beautiful, shareable card
Generate harmonious colour schemes with copy-paste HEX codes
Turn a name or initials into an elegant monogram
Two names → a fun love-match % + shareable card
A silly quiz for your true internet self
Aesthetic, gamer, cute… username ideas + a matching bio
Turn your name into a beautiful script signature
What's your Korean name? By sound or by meaning
What's your Chinese name? A meaningful 谐音, by sound or meaning
What's your Japanese name? Real names, by sound or meaning
What's your Thai name? Real names, by sound or meaning
What's your Malay name? Beautiful, meaningful, by sound or meaning
What's your Indonesian name? Beautiful, meaningful, by sound or meaning
What's your English name? Matched by sound or meaning
Net & gross WPM, accuracy and consistency — words or classic quotes, scored locally
Generate random names for fiction, gaming, projects and baby name inspiration — with gender and origin filters.
Generate truly random numbers, sequences and picks — for games, decisions and statistics.
Flip a virtual coin instantly
Convert between Roman numerals and Arabic numbers instantly — with step-by-step explanation.
Roll any dice combination — D4 to D100, custom dice, multiple rolls and full roll history.
Randomly split people into teams
Calculate your exact age in years, months, days — and find out what day you were born.
Spin a wheel to make decisions
Set a countdown timer or count to a target date — with Pomodoro mode and browser notifications.
A clean, precise online stopwatch with lap tracking — works in any browser, no install needed.
Focus timer with Pomodoro technique
Generate random words for creative writing, games, brainstorming and vocabulary practice — with filters by length and type.
Generate HMAC signatures with SHA-1, SHA-256, SHA-384 or SHA-512. Output as hex, base64 or base64url. All computation in your browser — your secret never leaves this page.
See the impermanent loss on a liquidity position vs just holding
Calculate your crypto profit or loss — enter buy and sell prices to see your exact return on investment.
Convert Bitcoin to SGD, USD, EUR and more — with live rates updated every 60 seconds.
Calculate Ethereum gas fees in ETH and USD — understand what you'll pay before you confirm any transaction.
Convert between Wei, Gwei, ETH
Calculate NFT creator royalty earnings
Generate and verify TOTP codes (RFC 6238) entirely in your browser.
Generate 2048/3072/4096-bit RSA keypairs in PEM and JWK formats, in-browser.
Hash passwords with bcrypt and verify hashes — all client-side, cost-factor adjustable.
zxcvbn-style entropy + crack-time at 4 attack profiles · browser-only
A / AAAA / MX / TXT / CNAME / NS / SOA via Cloudflare DoH (1.1.1.1)
CIDR + mask + broadcast + usable hosts + RFC 1918 detection
Email authentication audit · policy explainer · 9 common DKIM selectors
Expand, compress and subnet any IPv6 address
Turn CIDR notation into the exact IP range it covers
Score a vulnerability with the official CVSS v3.1 base metrics
Memorable, strong passphrases — generated in your browser
What to eat in Singapore — pick a traditional dish at random
What to eat in Malaysia — pick a traditional dish at random
Can't decide what to eat? Pick a dish from 80 world classics
What to eat in Hong Kong — pick a Cantonese dish at random
What to eat in Taiwan — pick a dish at random
What to eat in Macau — Macanese, Cantonese, or Portuguese
What to eat in Thailand — pick a dish (and a spice level)
What to eat in Vietnam — pick a dish at random
Mau makan apa? Pick a traditional Indonesian dish at random
How long jet lag will last — and how to beat it faster
Opening ask, target, walk-away
Side-by-side weighted scoring
WFH vs commute, real dollar terms
Urgent/Important task sorter
Weighted scoring · multi-criteria
Your new pay, the increase, and the real raise after inflation
Weekly and yearly pay with time-and-a-half and double time
Add up clock-in/out times into weekly hours and pay
How much paid leave you’ve earned, used and have left
Estimate retrenchment / severance benefits by tenure
Turn the fewest leave days into the longest breaks
GPA across global grading scales
"What do I need on the final?"
APA / MLA / Chicago / Harvard
Your current course grade — and what you need on what’s left
Grade a test in seconds — percentage, letter and a full chart
The GPA you need from here to hit your goal
Convert CGPA to percentage and back — instantly
Your attendance %, and how many classes you can still miss
See what your education fund grows to — and how much is growth
Add up the real cost of a degree, credit by credit
All readings of a 多音字, with example words
Common words that contain a given character, with pinyin
Common 近義詞 and 反義詞 for a word — a curated reference
Total your ALs, find your posting group, check indicative cut-offs
Annual CO₂e tonnes from 5 categories
Add your appliances, see the bill, the carbon, and where to cut
Size the unit, then see what inverter vs non-inverter really costs
See generation, bill savings and the year your panels pay for themselves
How much rain your roof could catch — and what a tank would deliver
The real carbon cost of a flight — and what it takes to offset it
Compare car, motorbike, MRT, bus, bike — by carbon and by cost
See the carbon in your weekly plate — and the easiest swaps to cut it
Turn your weekly recycling into carbon, energy and landfill saved
How much carbon your trees absorb — and what it takes to offset a footprint
Cubic yards / meters for any pour
Gallons / liters for any room
Tiles + grout for any area
Air conditioner sizing made simple
Volume + chemistry in one tool
Sheets, mud, screws + tape for a room
Cubic yards, tons + bags for any area
Heater size to warm your pool in time
Steps, riser, run + stringer length
Pitch, angle, grade + rafter multiplier
Cement, sand, aggregate + water for a volume
Total rebar weight + cost for a slab
How many rolls of wallpaper you need — pattern repeat included
How much carpet to order — floor area plus waste, in m², ft² and yd²
How many packs of laminate, vinyl or hardwood flooring you need
Posts, panels and rails for a fence run
How many deck boards you need — gaps and waste included
Turf rolls and grass-seed weight for a new lawn
How many bricks (and mortar) for a wall
Board feet of lumber from thickness, width and length
Total R-value and U-value of a layered wall, roof or floor
Gutter length and number of downspouts for a roof run
Scale recipes by serving ratio
Cups, tbsp, ml, grams — any direction
Baker's percentages, 7 style presets
OG/FG → ABV, attenuation, calories
Convert cups, grams, ml, and tablespoons — density-aware
Convert any oven recipe to air-fryer temperature and time
Roasting time, oven temperature and rest time by weight
Swap pan sizes and shapes — and scale the recipe to fit
Hydration and baker’s percentages for any bread formula
Dial in coffee and water for any brew ratio
MPG / L/100km / km/L + trip cost
Reaction + braking by speed
ETRTO comparison + speedo error
Cost to charge + cost per mile vs petrol
True cost of leasing vs financing
Monthly payment, total interest and the payoff curve for your car loan
Work backwards from a budget to the car price you can actually afford
Project your car’s resale value and what it loses each year
The real yearly and monthly cost of running a car — not just the price
Convert hp, kW and torque@rpm — and check power-to-weight
CKD-EPI 2021 race-neutral eGFR
Classic 1972 LDL estimation
AFib stroke risk stratification
Mosteller, Du Bois & Haycock BSA — for dosing and cardiac index
Estimate CrCl for renal drug dosing
1-year major bleed risk on anticoagulation
Pre-test probability for DVT and PE
30-day mortality band + admit decision
Albumin-corrected serum calcium
Metabolic-acidosis screen + albumin correction
Heart-rate-corrected QT with three formulas
Eye + verbal + motor = 3–15 severity
NEC voltage drop %
Ampacity + voltage drop combined
4/5/6 band IEC 60062 decoder
Laminar vs turbulent regime
Conservation of energy fluid
ISO 4.6–12.9, M6–M36
Simply-supported + cantilever
Multi-stage compound trains
Darcy-Weisbach head loss
Tip deflection + slope from point + UDL
Second moment of area, section modulus, radius of gyration
Critical buckling load for slender columns
Head loss + velocity in pressurised water pipes
TDH = static + friction + pressure + velocity head
Wind pressure + force on a flat surface
WHS Handicap Index
Pitcher quality, defense removed
Earned runs per nine innings
The ICC tournament tiebreaker
Scoring efficiency across 2s, 3s + free throws
Goalie SV% and possession Corsi For %
Stat line → points in all three formats
The official 0–158.3 NFL quarterback passer rating
The watts you need to hold a speed — and where they go
Your swim pace per 100m, speed and even-pace splits
Wang 2020 epigenetic formula
AAFP/AAHA life-stage formula
RER + MER for dogs + cats
Monthly premium estimate for dogs + cats
Daily + per-meal portion from calories
Estimate how big your puppy will grow
Gauge the risk if your dog ate chocolate — then call your vet
Estimate your dog’s due date and whelping window
Estimate your pet’s ideal weight from its body condition
How much water your dog or cat should drink a day
V = IR — solve for voltage, current or resistance · 7 curricula
Buffer pH from pKa and the base/acid ratio
Molarity from mass, and dilution volumes
Concentration from absorbance
Limiting reagent, theoretical + percent yield
From percent composition to formula
Solve for pressure, volume, moles or temperature
Remaining amount or half-life from decay
F = ma — solve for force, mass or acceleration · 7 curricula
F = Gm₁m₂/r² — solve for force, mass or distance · 7 curricula
pH ↔ pOH ↔ [H⁺] ↔ [OH⁻] — convert any one · 7 curricula
M = n/V — solve for molarity, moles, volume or mass · 7 curricula
Parse a chemical formula, sum the atomic masses · 7 curricula
ρ = m/V — solve for density, mass or volume · 7 curricula
118 elements, names in your curriculum language · 7 curricula
Monohybrid & dihybrid crosses, instant ratios · 7 curricula
Codon ↔ amino acid lookup + full code table · 7 curricula
KE = ½mv² — solve for energy, mass or velocity · 3 curricula
PE = mgh — solve for energy, mass or height · 3 curricula
p = mv — solve for momentum, mass or velocity · 3 curricula
v = fλ — solve for speed, frequency or wavelength · 3 curricula
n₁sinθ₁ = n₂sinθ₂ — solve for index or angle · 3 curricula
Q = mcΔT — solve for heat, mass, specific heat or ΔT · 3 curricula
Moles ↔ particles ↔ mass · 3 curricula
PV = nRT — solve for pressure, volume, moles or temperature · 3 curricula
M₁V₁ = M₂V₂ — work out a solution dilution · 3 curricula
ΔG = ΔH − TΔS — solve and check spontaneity · 3 curricula
20 amino acids — codes, names, codons · 3 curricula
M = objective × eyepiece — work out magnification · 3 curricula
Solve any of s, u, v, a, t from the equations of motion
E = E° − (RT/nF) ln Q — cell potential at non-standard conditions
Stage time = (cells in stage ÷ total cells) × cell-cycle time
p + q = 1 and p² + 2pq + q² = 1 — genotype frequencies from allele frequencies
Allele frequencies from genotype counts — with a χ² test against Hardy-Weinberg
Pressure + density altitude for takeoff performance
Wind components from runway heading
TAS from CAS, altitude and temperature
Rode length to let out for safe anchoring
Feels-like temperature, hot or cold
Estimate walking time over distance + ascent
Flash-to-bang distance + the 30-30 rule
Sunrise, sunset, golden hour and day length for anywhere
Calories burned hiking — with pack weight, grade and terrain
How muggy will it feel? Dew point from temperature and humidity
A fast, free online calculator
Add, subtract, multiply and divide fractions
Long division with full worked steps
Greatest common divisor and least common multiple
Is it prime? Plus full factorisation
Round to places, sig figs, or nearest 5/10/100
Mean, median, mode, spread, quartiles & outliers
Raise any number to any power
log, ln, log₂ and any custom base
Square root, cube root, any nth root + surds
Solve 2×2 and 3×3 systems with working
Add, multiply, divide and evaluate polynomials
Factor polynomials and find their roots
Find a missing side of a right triangle
Area, circumference, radius, sector & arc
sin, cos, tan, their reciprocals and inverses
Solve any triangle from 3 measurements
Area and perimeter of any 2D shape
Volume and surface area of any solid
Differentiate any function, exactly
Antiderivatives and definite integrals
Evaluate limits, one-sided or at infinity
Determinant, inverse, eigenvalues and more
Dot, cross, magnitude, angle and projection
Arithmetic, polar form, powers and roots
Binary, hex and bitwise arithmetic
Mod, GCD, modular inverse and power
nCr, nPr and factorials for counting
Trig, logs, powers, roots and more
Simplify any ratio to its lowest terms
Solve a : b = c : x for the missing value
Write any number in words
Nth term and sum of an arithmetic or geometric sequence
Simplify an aspect ratio and resize without distortion
How far a measurement is from the true value, as a percentage
Cousin removal, great/grand & in-laws — US/UK/AU/Indian
Pak Long position system + Javanese/Sundanese/Sumatran/Tionghoa
First cousin once removed, second cousin — degree + removal, explained
Boomer, Gen X, Millennial, Gen Z or Alpha?
What blood type can our baby have?
The exact age gap between two people, to the day
How many ancestors do you have, generations back?
How much DNA do relatives share?
Your Chinese zodiac animal, element and yin-yang
Find your star sign, element and dates from your birthday
Look up the traditional 清宮表 — folklore, not medical
The science-based OCEAN test — 20 questions, scored in your browser
How you give and receive care — 25 questions, ranked profile, in your browser
Your four-letter type with honest axis bars — 32 questions, in your browser
How the 16 types pair up — communication, friction, growth. No fake scores.
Who the typing community files under each type — honestly framed
Your anxiety and avoidance scores, plus your style — 16 questions, in your browser
Your full ranked profile across all nine types — 36 questions, in your browser
Your ranked D-I-S-C working-style profile — 16 questions, in your browser
Your 3-letter RIASEC career code, plus all six interest scores — 24 questions
Four real emotional skills, ranked — no invented EQ number. 16 questions
Your default move in disagreements — and the tools you've stopped reaching for
The everyday-loving orientation, measured — 12 questions, 90 seconds
20 道题测五大人格维度 — 本机计分，答案不上传
20 道題測五大人格向度 — 本機計分，答案不上傳
20 soalan, lima faktor personaliti — dikira dalam pelayar, jawapan tidak dimuat naik
20 pertanyaan, lima faktor kepribadian — dihitung di browser, jawaban tidak diunggah
三字母职业代码 + 六类兴趣分数 — 本机计分，答案不上传
三字母何倫碼 + 六類興趣分數 — 本機計分，答案不上傳
Kod kerjaya 3 huruf + skor 6 tema minat — dikira dalam pelayar anda
Kode karier 3 huruf + skor 6 tema minat — dihitung di browser Anda
四项真实情绪技能的排序画像 — 不编造EQ总分，本机计分
四項真實情緒技能的排序剖繪 — 不編造EQ總分，本機計分
两条依恋维度的真实分数 — 类型只是把手，本机计分
兩條依戀維度的真實分數 — 類型只是把手，本機計分
五种被欣赏方式的排序画像 — 不发单一标签，本机计分
五種被欣賞方式的排序剖繪 — 不發單一標籤，本機計分
九个类型的完整排序画像 — 不编侧翼分数，本机计分
九個類型的完整排序剖繪 — 不編側翼分數，本機計分
四字母类型 + 维度真实分数与边界提示，本机计分
四字母類型 + 維度真實分數與邊界提示，本機計分
Build a structured AI prompt from a proven framework — RACE, CO-STAR, RTF, CRISPE or TAG
Build a system prompt for a custom GPT, Claude Project or AI agent
Build a spec-compliant /llms.txt to help AI models understand your site
Allow or block AI crawlers — GPTBot, ClaudeBot, Google-Extended and more
Count exact GPT tokens (tiktoken) plus words, characters & LLM estimates
Estimate GPT, Claude & Gemini API costs from token counts and volume
Convert between tokens, words and characters for LLM prompts
Compare one request's cost across GPT, Claude, Gemini & Mistral, ranked
Forecast monthly & annual API spend from requests per day
Price embedding a corpus for RAG: documents × tokens × model rate
See what % of each model's context window your text fills
Split text into token-sized chunks with overlap for RAG
Format input/output example pairs into a clean few-shot prompt
Fill {{variable}} placeholders in a reusable prompt template
Build a Claude-style sectioned prompt with XML tags or delimiters
Clean pasted text for prompts — spaces, smart quotes, HTML, more
Compare two prompts side by side and highlight what changed
Build a Midjourney command — subject, style and every parameter
Build a positive and negative Stable Diffusion prompt
Mix medium, style, lighting, lens and mood into an image prompt
AI image dimensions for any aspect ratio, snapped to multiples of 64
Native resolutions for SDXL, SD 1.5, Flux and Midjourney by aspect
Set per-term attention weights in AUTOMATIC1111 (term:1.2) syntax
Generate random 32-bit seeds for AI image generation
Generate a valid SKILL.md for a Claude Agent Skill
Build a valid MCP server entry for claude_desktop_config.json
Build the Instructions block for an OpenAI Custom GPT
Build a JSON Schema for LLM tool/function calling (OpenAI · Anthropic)
Build a rules file for Cursor, GitHub Copilot or AGENTS.md
Generate a realistic sample JSON instance from a JSON Schema
Fix broken or truncated JSON that LLMs emit
Align and prettify Markdown tables, or convert CSV/TSV to Markdown
Preview where an LLM stop sequence cuts generated text
See how temperature, top-p and top-k reshape token probabilities
See exactly how text splits into GPT tokens, colour-coded
Searchable reference of LLM sampling parameters and their effects
A searchable glossary of 50+ AI and LLM terms in plain English
Build structured Chinese prompts for DeepSeek, Qwen, Doubao, Kimi and more
Build structured prompts for DeepSeek V3 (chat) and R1 (reasoning)
Build structured Chinese prompts for Alibaba Qwen (通义千问)
Build conversational and persona prompts for Doubao (豆包)
Build long-document prompts for Kimi — summarize, extract, Q&A
Build Chinese writing and office prompts for ERNIE (文心一言)
Build agent and tool-calling prompts for Zhipu GLM (智谱)
Build prompts for Xiaohongshu (小红书) notes — hook, selling points, tags
Build short-video script prompts for Douyin (抖音) — hook, structure, CTA
Build long-form prompts for WeChat (公众号) articles — angle, structure, tone
Build answer prompts for Zhihu (知乎) — stance, evidence, structure
Build product-copy prompts for Taobao/Tmall/JD/PDD
Build prompts that generate honest Chinese headlines for any platform
Build prompts to write or polish a Chinese resume / cover letter
Build text-to-image prompts for Jimeng, Wan, Hunyuan and more
Build text-to-image prompts tuned for ByteDance Jimeng (即梦)
Build text-to-image prompts tuned for Alibaba Wan (通义万相)
Build text-to-image prompts tuned for Tencent Hunyuan (混元)
Stack guofeng and Chinese-art styles into one AI-image prompt
Build AI-art negative prompts in Chinese + English
Add (term:weight) emphasis syntax to Chinese AI-image prompts
Build text-to-video prompts for Seedance, Kling, Hailuo, Vidu
Build text-to-video prompts tuned for ByteDance Seedance (即梦)
Build text-to-video prompts tuned for Kuaishou Kling (可灵)
Build text-to-video prompts tuned for MiniMax Hailuo (海螺)
Build text-to-video prompts tuned for Shengshu Vidu
Build image-to-video (图生视频) motion prompts
Estimate tokens and per-model API cost for DeepSeek, Qwen, Kimi and more
Compare Chinese chat models — price, context, type
Compare Seedance, Kling, Hailuo, Vidu — duration, resolution, access
Compare Jimeng, Wan, Hunyuan, ERNIE-ViLG, Kolors
Normalize Chinese prompts — full-width punctuation, spacing, quotes
A searchable bilingual glossary of 40+ AI and LLM terms
Quick-reference prices for Chinese chat, image and video models
Build music prompts for SkyMusic, Haimian and Suno
Build a Chinese system prompt / persona — role, rules, boundaries
Build a Chinese roleplay character card for chat models
Build a step-by-step reasoning prompt in Chinese
Format input/output example pairs into a few-shot prompt
Build an AI agent system prompt — role, tools, workflow, limits
Build a grounded, cited RAG / knowledge-base prompt in Chinese
Build a Coze (扣子) bot persona prompt