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 These figures reflect RECATOOLS research as of 4 Sep 2026 and may be out of date or incomplete.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)
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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