Liner
AI research search with per-line citations across 200M+ sources
Overview
Liner is a Seoul-based AI search and research assistant that answers with per-line source citations across a claimed 200M+ document index, with a Scholar mode for academic literature and one-click APA, MLA or Chicago citation export for students and researchers.
Pricing
Pricing shown for reference only. These figures reflect RECATOOLS research as of 12 Jul 2026 and may be out of date or incomplete. This is not financial or purchasing advice — always confirm the current price on the provider’s official website before making any decision.
- 100 agent credits/mo
- Unlimited Advanced Search
- 1 file upload/day (25MB max)
- Unlimited Advanced Search, Image Gen & Deep Research
- 20 file uploads/day (100MB max)
- Access to major AI models
- Unlimited daily file uploads (200MB max)
- Dedicated workspace
- Team data excluded from AI training
- Centralized master account
- Admin controls
- Early access to collaboration features
- Dedicated account manager
- Onboarding sessions
- Audit logs
What you can produce with Liner
- Per-line citations across a claimed 200M+ indexed sources
- Scholar mode restricted to academic literature
- One-click APA, MLA and Chicago citation export
- Browser extension for web highlighting and saving
- PDF Copilot for document analysis
- YouTube summarization and highlighting
- Team workspaces with admin controls (Team/Enterprise)
ASEAN Perspective
Liner in Southeast Asia
ASEAN-region availability and pricing notes coming soon. Drop the editorial team a note via /contact/ if you can supply local context (Singapore/Malaysia/Indonesia/Thailand/Vietnam).
Liner earns its keep on citation traceability — every claim links back to a specific line in a specific source, and Scholar mode narrows that source pool to academic literature with one-click APA/MLA/Chicago export. For a literature review or a term paper where you need to defend where a fact came from, that's a real feature, not a gimmick layered on top of a generic chatbot.
The company is a decade old (founded 2015, Seoul) with real funding ($36.4M total) and a claimed 10 million users, so it's not a fly-by-night wrapper. But the free tier is thin — 100 agent credits and daily search caps push most serious use toward the $17.99+/month Pro plan — and Trustpilot reviews flag billing surprises around forgotten trial cancellations plus accuracy complaints on niche factual questions. Good for students and researchers; verify anything load-bearing against the primary source.
What people say
Liner is a decade-old Seoul startup — founded in 2015 by Luke Jinu Kim and Brian (Chanmin) Woo — that's raised $36.4M total, most recently a 27 billion won Series B2 led by Atinum Investment and InterVest with Samsung Venture Investment and LB Investment following on. The company claims 10 million users across 220+ countries, which puts it well past the scrappy-startup stage even if it's not a household name outside research and student circles.
The product itself centers on per-line citation: answers link back to specific lines in specific sources across a claimed 200 million-document index, which is the feature that separates it from a generic AI chatbot. Scholar mode narrows results to academic literature and adds one-click APA, MLA or Chicago citation export. Beyond the core search, Liner extends into a browser extension for web highlighting, a PDF Copilot for document analysis, and YouTube summarization/highlighting — the pitch being one tool that follows you across formats rather than four separate ones.
Pricing runs five tiers: Free (100 agent credits a month, ad-supported, one file upload a day capped at 25MB), Pro at $17.99/month ($14.99 on annual billing) with unlimited search and an ad-free experience, Max at $35.99/month ($29.99 annual) adding unlimited daily uploads and a dedicated workspace, Team at $26.99 per seat, and custom Enterprise pricing with audit logs and a dedicated account manager.
Trustpilot reception is mixed and comes with real friction points. Recurring complaints center on the free-trial-to-paid conversion — one user described a forgotten trial cancellation turning into a roughly $400 annual charge, with refunds reportedly hard to get once billed. Accuracy complaints show up too: users report the assistant mixing up similar geographic or technical terms and returning answers that don't hold up. One reviewer who upgraded to a $200+/year plan reported the service running slow and crashing repeatedly with recurring error messages. None of that erases the core citation feature, which independent reviewers do credit for literature-review and source-tracking use cases — but the billing complaints are common enough to flag before anyone signs up for a free trial expecting to cancel easily.
Summary of public user & expert reviews, compiled by RECATOOLS.
About this listing
This entry was compiled from publicly available data including Liner's official website, press releases, documentation, and reputable third-party publications. RECATOOLS is not affiliated with Liner unless explicitly stated.
Third-party AI tools update their pricing, features, availability, and policies frequently. Information here may be outdated by the time you read this — we make reasonable efforts to keep listings current, but cannot guarantee absolute accuracy.
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