Liner
By Coda One Team · Last verified: March 2026
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AI-powered research assistant for web search and academic papers
What is Liner?
Liner is an AI-powered research assistant that enhances web search and content discovery. It provides AI-generated answers with cited sources, highlights key information from web pages, and helps users organize research materials. The tool is available as a browser extension and mobile app, integrating directly into the user's browsing workflow.
The platform's core feature is its AI search engine that generates concise, sourced answers to research queries. Unlike general-purpose chatbots, Liner pulls information from web pages and academic papers, providing citations so users can verify claims. Users can highlight and save passages from any web page, PDF, or article, building a personal knowledge base of research materials.
Liner supports academic research with features like paper discovery, PDF annotation, and reference management. Students and researchers can search across academic databases, highlight key findings in papers, and organize sources by topic. The AI can summarize lengthy papers and explain complex concepts, making it useful for literature reviews and study sessions.
With over 10 million users, Liner has found strong adoption among students, researchers, and knowledge workers. It competes with tools like Perplexity AI for AI-powered search but differentiates through its highlighting, annotation, and content organization features that support deeper research workflows.
Key Features
Pros & Cons
Pros
- ✓ AI answers include source citations for verification
- ✓ Highlighting and annotation tools support deep research
- ✓ Integrates into existing browsing workflow via extension
- ✓ Strong academic paper search and PDF support
Cons
- ✗ Free tier has limited daily AI queries
- ✗ Highlighting features overlap with simpler free alternatives
- ✗ Search quality varies depending on topic and available sources
Ready to try Liner?
See if it fits your workflow — free plan available.
Video Tutorials
How-To Perfect Cat-Eye Liner | Feline Liner Tutorial | Shonagh Scott
Shonagh Scott
Pricing
Free basic use; Premium at $8.99/month for unlimited AI features
Free
$0
- ✓Limited AI search queries per day
- ✓Web highlighting and saving
- ✓Basic content organization
- ✓Browser extension
Premium
$8.99/month
- ✓Unlimited AI search and answers
- ✓Advanced PDF annotation
- ✓Unlimited highlights and saves
- ✓Priority AI processing
- ✓Ad-free experience
Pay with crypto using a virtual Visa card
Humanize AI content from Liner
Transform AI-generated text into natural, human-sounding writing that bypasses detection tools.
Try FreeWho is Liner for?
Students researching topics for papers and assignments
Academic researchers conducting literature reviews
Knowledge workers organizing information from multiple sources
Getting AI-generated answers with verifiable source citations
Annotating and highlighting web articles and PDFs for later reference
Frequently Asked Questions
Is Liner free?
Liner offers a free tier with limited features. Free basic use; Premium at $8.99/month for unlimited AI features Paid plans unlock additional capabilities.
What are Liner's key features?
Liner's standout features include AI-powered search with cited source answers, Web page and PDF highlighting and annotation, Personal knowledge base for saved research, Academic paper search and discovery. It offers 7 features in total designed for students researching topics for papers and assignments.
Can I pay for Liner with cryptocurrency?
Liner does not currently accept cryptocurrency directly. However, you can pay with crypto using a virtual Visa card funded by USDT, USDC, or other stablecoins.
What are the best alternatives to Liner?
Popular alternatives to Liner include Consensus, DeepL, Duolingo. Each offers different strengths in pricing, features, and specialization.
Do I need to sign up to use Liner?
Liner requires an account to access most features. If you prefer no-signup tools, browse Coda One's free tools.
Does Liner work on mobile?
Liner works in any modern browser on desktop, tablet, and mobile — no install required. For offline or on-device workflows, check our tool catalog for alternatives.
Is my data safe with Liner?
Review Liner's privacy policy at https://getliner.com for specifics on data retention. For browser-local processing (no server upload), see Coda One's PDF and image tools.
What pricing plans does Liner offer?
Liner offers 2 plans: Free, Premium. Starts at Free. Compare with Coda One's own pricing.
Can I cancel or get a refund from Liner?
Cancellation and refund policies are set by Liner — check their terms at https://getliner.com. Coda One's own paid plans can be cancelled anytime from your subscription dashboard.
How can I pay for Liner with USDT or USDC?
Since Liner does not take crypto directly, the practical route is a Coda One virtual Visa card funded by USDT/USDC, which works anywhere Visa is accepted.
Who is Liner best for?
Liner is most useful for Students researching topics for papers and assignments, Academic researchers conducting literature reviews, Knowledge workers organizing information from multiple sources. For related workflows, explore Coda One's AI tool catalog.
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