What is Liner.ai?
Liner.ai is an AI research assistant that answers questions with links to its sources. It started as a tool for highlighting text on web pages and has grown into an AI search and research platform used by students and professionals.
It works like a search engine that writes the answer for you. You ask a question, Liner searches the web, summarises what it finds and cites each source, and you can go deeper with a full research report or by uploading your own files.
Key Features
Liner.ai’s key features are AI search with cited sources, research reports, questions about uploaded files of up to 200MB, access to leading AI models on paid plans and a browser extension with highlighting.
- Advanced Search: Returns AI answers with cited sources. Free users get three advanced searches a day, and Pro and Max get unlimited use. Liner says it outperforms competitors on OpenAI’s SimpleQA benchmark.
- Simple Search: A faster search mode sits beside Advanced Search, and both paid plans list it as unlimited.
- Research Reports: Generates longer, structured reports on a topic. The allowance is three a month on Free, 25 on Pro and 200 on Max.
- File questions: Lets you upload documents and ask about them. Free allows one question a day on a 25MB file, Pro 20 a day with five files of 100MB each, and Max unlimited.
- Choice of AI models: Pro and Max include what Liner describes as full access to the latest top AI models.
- Browser extension: The Chrome extension answers questions and summarises web pages, PDFs and YouTube videos beside what you are reading. Its store listing shows about 300,000 users.
- Web highlighter: Highlights, annotates and bookmarks text on pages you read, the feature Liner started with, and keeps the saved items organised.
- Interface languages: The web app offers English, Korean, Japanese and Simplified Chinese interfaces.
Pros
Liner.ai’s main advantages are answers that show their sources, unlimited searches on both paid plans, research reports and file analysis in one tool, and a free plan for occasional use.
- Sources shown: Answers link to the pages they draw on, so you can open the original and check a claim before using it.
- Unlimited search on paid plans: Pro at $15 a month on annual billing removes the daily cap on both Simple and Advanced Search.
- Built for research: Research reports and file questions go beyond quick answers, and Max accepts up to 20 files of 200MB each per question.
- Free to try: The Free plan includes three advanced searches a day, three research reports a month and one file question a day.
- Works where you read: The Chrome extension covers web pages, PDFs and YouTube, and was last updated on 1 October 2026 according to its store listing.
- Published accuracy claim: Liner cites a public benchmark, SimpleQA, for its accuracy claim, which gives buyers something specific to check.
Cons
Liner.ai’s main drawbacks are a small free allowance of three advanced searches a day, prices shown only for annual billing, and monthly caps on research reports even on paid plans.
- Small free allowance: Free users get three advanced searches a day, three reports a month and one file question a day on a file of up to 25MB.
- Annual pricing shown: The pricing page quotes $15 and $30 a month billed annually. It did not show a month-to-month price when we checked.
- Report limits: Pro caps research reports at 25 a month. Heavy users need Max at $30 a month for 200 reports.
- File caps on Pro: Pro allows 20 file questions a day, with up to five files of 100MB per question. Only Max removes the daily limit.
- No team plan listed: The pricing page shows individual plans only, with no team or education tier.
- Summaries can mislead: Any AI summary can misread a source, so open the cited page for statistics, quotes and anything you plan to publish.
Who is Using Liner.ai?
- Students: Find and cite sources for assignments.
- Researchers and analysts: Produce quick literature and market overviews.
- Writers and journalists: Check facts and collect references.
- Knowledge workers: Question long reports and PDFs.
Pricing
Liner.ai has a free plan, and paid plans start at $15 per month on annual billing (official prices, October 2026).
| Plan | Price | What you get |
|---|---|---|
| Free | $0 | 3 advanced searches a day, 3 research reports a month, 1 file question a day |
| Pro | $15 / month, billed annually | Unlimited searches, 25 research reports a month, 20 file questions a day |
| Max | $30 / month, billed annually | Unlimited searches and file questions, 200 research reports a month |
Disclaimer: Pricing can change. Check the official Liner website.
What Makes Liner.ai Unique?
Liner.ai stands out for its focus on trustworthy sources and research depth. It reports strong results on a public factual accuracy benchmark, and it pairs search with highlighting and file analysis, so reading, saving and asking happen in one place.
Compatibilities and Integrations
- Platforms: Web app and mobile apps.
- Extensions: Chrome and Safari.
- Files: Uploads up to 25MB on Free and larger on paid plans.
- API: No public API confirmed.
Liner.ai Tutorials
You can learn how to use Liner.ai in a few minutes:
- Open getliner.com and sign in.
- Ask a specific question and read the cited answer.
- Open the sources to confirm the key points.
- Request a research report or upload a file for a deeper look.
How We Rated It
| Criterion | Score | Why |
|---|---|---|
| Accuracy and Reliability | 4.4/5 | Cited sources |
| Ease of Use | 4.5/5 | Search-style interface |
| Functionality and Features | 4.4/5 | Search, reports, files |
| Performance and Speed | 4.4/5 | Quick answers |
| Customization and Flexibility | 4.1/5 | Choice of AI models |
| Data Privacy and Security | 4.0/5 | Standard policies |
| Support and Resources | 4.0/5 | Help centre |
| Cost-Efficiency | 4.1/5 | Tight free limits |
| Integration Capabilities | 4.0/5 | Browser extensions |
| Overall Score | 4.2/5 | Average of the nine criteria |
Summary
Liner.ai is a strong research tool for people who need sourced answers and longer reports. The free plan is enough for occasional questions, and Pro suits students and analysts who search every day. Always verify important claims in the original source. Check the pricing page before you subscribe to it.
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