What it is
Overview
Liner positions itself as an AI research assistant that searches the web, generates content with citations, and fact-checks claims across academic and professional contexts. The tool wraps multiple AI capabilities into a unified interface focused on sourced research and writing. With 7.2 million monthly visits, the audience skews toward researchers, students, and content creators who need documented sources rather than unsupported AI output. Early reviewers praise the citation integration and academic source discovery, though the small sample size makes sentiment patterns unreliable.
At a glance
Usability & Quality overview
Best for
- citation-backed search
- academic research drafting
- note-taking and export workflows
Watch out for
- Research outputs may be verbose or omit key details.
- Some users reported fabricated or unreliable citations.
- Pricing changes may be abrupt.
Built on another provider's modelResells a third-party model API
Liner offers specialized research features like academic source integration, investment data analysis, and citation tracking that go beyond basic AI chat. The highlighting and annotation workflow provides value over generic AI tools, though some users report the interface has become more complex over time.
Moderate evidenceQuality score
Liner Citation-backed AI search and research with note-taking and export workflows, but citation trust is uneven.
This score is our editorial judgment, computed automatically from the sources, weights, and dates shown above. It reflects the data we could verify as of October 12, 2026, not a guarantee or statement of fact about Liner. Third-party ratings and quotes belong to their original platforms and authors. Thin data lowers our confidence label, and we say so instead of guessing. Work on Liner? Dispute any datapoint and we will review it, publish your response, and correct verified errors.
Plans
Pricing
How free is free?
Free with limits
100 credits/day on free; Pro $18/mo for 1,000 credits/month
What you get for free
- 100 credits per day for AI agent interactions
- Unlimited Advanced Search functionality
- Access to Image Generation and Deep Research
- 1 file upload per day (up to 25MB per file)
- Answers include advertisements
Behind the paywall
- Higher credit allowance (1,000+ credits/month)Pro
- Ad-free answersPro
- Access to major AI models (ChatGPT, Gemini, Claude)Pro
- 20+ file uploads per dayPro
- Larger file size limits (100MB+)Pro
Community feedback
Aggregated reviews
Ratings and quoted comments below are aggregated from third-party sources and reflect those users' views, not SearchTools.ai's.
What reviewers talk about
themes inside the Sentiment pillar — not score ingredients
53Output Quality35 mentions
“Liner is an amazing tool for online research! Highlighting text directly on websites and PDFs saves me so much time when taking notes. The AI summaries are incredibly helpful for understanding long articles quickly and everything stays perfectly organized in one place. Highly recommended for any student.”
“Memo feature for highlights no longer works, text search does not work for highlighted text or memos only for the title of website themselves.”
“WHY DID LINER CITE WIKIPEDIA! I saw in the ad that it was supposed to cite reliable sources! TRASH! DON'T USE! I WILL UNINSTALL IF THIS DOESN'T GET FIXED. Edit: The filter seemed to help. I will change my rating now.”
“Major design flaw: Big problem: it saves ONLY the highlighted text from a web page, instead of the whole article with portions highlighted. Not useful for serious researchers.”
15Reliability10 mentions
“Lovely annotation tool: This mobile annotation tool is very useful if you want important notes to be taken for future reference. Even sweeter thing is your annotations are cloud sync'ed, so you can access them later on the desktop. This sync feature is very important for me and really stands out as a brilliant app. Highly recommend it.”
“Didn't work: Did not work. App won't even open.”
“non functional ... no input button. app freezing or extremely lagging... failure to utilize 40 research credits. New credits system seems too constrained (how often are the 100 topped off?). How do I SEND the message/prompt?? Was, kinda, worth the lag before... great research capabilities.”
“It's a nice app, but it's VERY BUGGY. Dragging highlights is very erratic. I sometimes spend more time picking out the edges of a highlighted section than actually appreciating what the highlighted text means. Also, when working with pdf files, after highlighting something, the bubble won't appear the next time you want to highlight something else. You'll have to close the file to get if back. This is mildly infuriating to be honest.”
44Ease of Use23 mentions
“Useful App: I found this app to be quite useful as I'm always saving and sharing information in my iBooks and the web. It's easy to use and has the features available just where you would copy paste information by hold/press action. I'm not sure why this wan't invented much sooner. Thanks!”
“The direction of the app changed from web highlighter into jumbled world of AI. Your highlights are now all over the place, and the UX for saving your highlights changed from folders, hashtags, to threads just to cater to AI hype. Uninstalling.”
“Useless!: This app is useless. Wants you to sign up when you sign up still useless!!!”
“Had to change my review, I previously called this a "good highlighting tool with a useless social media element attached". This now almost an entirely social media / article suggestion app. They've updated the interface and I can't even see where I'm supposed to entire sites to highlight text anymore??? I don't even think you can highlight with this anymore! Can't see the option to anywhere!”
Capabilities
Key features
Search Engine
Answers questions by searching the web and synthesizing results with sources
Research Tool
Gathers, searches, and organizes sources to help you investigate a topic
Writing Assistants
Helps you draft, edit, and polish written content across many formats
The honest take
What users love & flag
Distinct themes surfaced across 12K reviews from 3 sources — each grounded in real review text, ranked by how often it comes up.
Questions
Frequently asked
What is Liner?
Liner is an AI platform with three specialized agents for professionals: accurate search with citations, comprehensive academic research tools, and integrated writing assistance. It focuses on providing reliable AI assistance with source verification and fact-checking capabilities, addressing the challenge of accuracy that many AI tools face.
How does Liner ensure accuracy compared to other AI tools?
Liner achieved higher accuracy scores than competing AI models in OpenAI's SimpleQA tests, outperforming ChatGPT's advanced model. Every answer comes with clickable citations that allow users to verify sources with one click, and the platform is specifically designed to address reliability concerns that plague many AI tools.
What are the three main AI agents in Liner?
Liner Search provides accurate answers with clickable citations and follow-up question capabilities. Liner Scholar streamlines academic workflows by finding research papers, generating literature reviews, and creating hypotheses. Liner Write combines search and writing in one interface for drafting emails, reports, and proposals while maintaining fact-checking abilities.
Is Liner free to use?
Yes, Liner offers a free plan with 100 credits per day, unlimited Advanced Search, access to Image Generation and Deep Research, and 1 file upload per day up to 25MB. Free users will see ads with their answers, but can access the core functionality without payment.
What file sizes and formats can Liner handle?
Liner can process uploaded documents up to 200MB on the Max plan, with Pro users getting up to 100MB files and free users limited to 25MB. The platform can analyze these documents for summaries and insights, with Pro users getting 20 uploads per day and Max users having unlimited uploads.
How much do Liner's paid plans cost?
The Pro plan costs $17.99/month (or $14.99/month annually) with 1,000 Agent credits and access to major AI models like ChatGPT, Gemini, and Claude. The Max plan is $35.99/month (or $29.99/month annually) with 2,500 credits and unlimited file uploads. Team plans start at $26.99/month per seat with centralized management.
What platforms is Liner available on?
Liner is available across multiple platforms including web app, browser extensions for Chrome and Edge, and mobile apps for iOS and Android. It also offers desktop applications for both Mac and Windows, providing flexibility to work across different devices and environments.
What makes Liner Scholar different from regular search tools?
Liner Scholar is specifically designed for academic workflows, offering features like literature review generation, research paper comparison, citation recommendations, hypothesis creation, and survey simulation. It can process academic documents and provide organized research reports, making it particularly valuable for researchers and academics.
Can Liner help with professional writing tasks?
Yes, Liner Write enables users to draft emails, newsletters, reports, and proposals while maintaining fact-checking capabilities within the same interface. This eliminates the need to switch between multiple applications, as users can research, verify facts, and write content all in one place.
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