Crypto

Hash passwords with bcrypt and verify hashes — all client-side, cost-factor adjustable.

Convert Bitcoin to SGD, USD, EUR and more — with live rates updated every 60 seconds.

DCA vs lump-sum side-by-side, with crypto-specific volatility assumptions.

Calculate your crypto profit or loss — enter buy and sell prices to see your exact return on investment.

Coin growth + USD value scenarios + validator fee + US tax on rewards.

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.

Convert between Wei, Gwei, ETH

What a transaction will cost you: gas limit × gas price, in ETH and USD. For converting gwei to ETH or USD, use the Gas Fee Converter.

Unit conversion between gwei, ETH and USD, with an L1 vs L2 split. To price a specific transaction instead, use the Gas Fee Calculator.

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 NFT creator royalty earnings

Generate 2048/3072/4096-bit RSA keypairs in PEM and JWK formats, in-browser.

Generate and verify TOTP codes (RFC 6238) entirely in your browser.