What is Liner?
Liner is an AI-powered search and research platform designed for people who need trustworthy, source-backed information rather than unverified answers. It delivers fast responses grounded in credible references such as academic papers, authoritative publications, and quality web sources, with citations so users can open and verify each claim.
A dedicated Scholar mode helps researchers find relevant papers with high accuracy, then compare studies, surface gaps, and strengthen arguments across a research workflow, while a Learn experience supports students looking for reliable explanations.
Liner originally became known as a web and PDF highlighter, and it still offers tools to highlight, save, and organize content, now combined with AI search, research, and writing assistance in one workflow.
It is available through browser extensions for Chrome, Safari, Edge, Opera, and Whale, as well as iOS and Android apps, and the company reports a large global user base of students and researchers.
Strengths include citation-first answers, an academic-focused Scholar mode, and convenient highlighting and cross-platform access; weaknesses are that the most useful research and unlimited features sit behind a paid subscription, and as an answer engine it can still require user verification of sources.
Liner is best for students and knowledge workers who prioritize accuracy and citations. Pricing changes often, so check the official site for current plans.
Liner's core capabilities include Citation-backed AI search answers, Scholar mode for academic paper research, Web and PDF highlighting and saving, Browser extensions for major browsers, iOS and Android apps and Writing assistance.
Citation-backed AI search answers is built in, Scholar mode for academic paper research is built in, Web and PDF highlighting and saving is built in, Browser extensions for major browsers is built in, so you get a rounded toolkit rather than a single trick.
Each feature is designed to take the manual effort out of the task and help you reach a usable result faster, which is what makes Liner worth a place on your shortlist.
On the plus side, users consistently highlight Answers grounded in verifiable, cited sources, Dedicated academic research mode and Available across browsers and mobile as the reasons they keep using Liner.
It isn't perfect, though — Best features require a paid subscription and Still requires users to verify sources are the trade-offs people most often mention, so weigh those against your own priorities before you commit.
As with any AI tool, the output still benefits from a quick human review, but Liner gets you most of the way there with far less effort.
Liner runs on a freemium pricing model, so you can start for free and only pay once you outgrow the free tier — handy for testing it on a real task before spending anything.
AI-tool pricing changes often, so always check the current plans, seats and add-ons on the official site for the latest details before you buy. Who is Liner for? It's best suited for ai search and research assistant with cited sources.
Whether you're a beginner trying this kind of AI tool for the first time or a professional who'll use it every day, it's a credible option to consider.
If you're still deciding, compare Liner against the alternatives and the head-to-head comparisons linked below — looking at features, pricing and real user ratings side by side is the fastest way to find the right fit for your workflow and budget.
Key features of Liner
- Citation-backed AI search answers
- Scholar mode for academic paper research
- Web and PDF highlighting and saving
- Browser extensions for major browsers
- IOS and Android apps
- Writing assistance
Liner pros and cons
| Pros | Cons |
|---|---|
| Answers grounded in verifiable, cited sources | Best features require a paid subscription |
| Dedicated academic research mode | Still requires users to verify sources |
| Available across browsers and mobile | — |
Liner pricing
Liner uses a freemium model: a free plan to get started, plus paid plans that unlock higher limits and advanced features. Pricing changes often, so check the official site for the latest plans and any free trial before you buy.
Who is Liner for?
Liner is best suited for ai search and research assistant with cited sources. Whether you are trying this kind of ai chatbots & assistants tool for the first time or use one every day, it is a credible option to shortlist — compare it with the alternatives and head-to-head comparisons linked on this page to find the best fit for your workflow and budget.
Liner at a glance
| Detail | Summary |
|---|---|
| Category | AI Chatbots & Assistants |
| Pricing model | Freemium |
| Free option | Yes |
| Best for | AI search and research assistant with cited sources |
| User rating | Not yet rated |
