Liner
Liner is an AI-powered research assistant and web highlighter that helps users find, highlight, and organize information from the web and PDFs.
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✓ Free plan available
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Liner combines AI-assisted search with a browser extension that lets users highlight text on any webpage or PDF, then surfaces those highlights for later review. Its AI layer (Liner AI) can answer questions by drawing on trusted web sources, reducing time spent sifting through irrelevant results. It positions itself as a productivity tool for students and knowledge workers who do heavy online research.
Best for: Students, researchers, and knowledge workers who frequently read and annotate web pages and PDFs
Key Features
- AI-powered web search with cited sources
- Browser extension for highlighting web pages and PDFs
- Personal highlight library with organization and tagging
- AI chat / Q&A over saved content
- Recommended content based on saved highlights
- YouTube video highlighting and timestamping
- Mobile app (iOS & Android) for reading and highlights
Pros
- Seamless browser extension makes highlighting frictionless across virtually any webpage
- AI answers cite sources directly, making fact-checking straightforward
- Highlight library syncs across devices and is easy to search
- Supports PDFs, YouTube videos, and standard web pages in one tool
Cons
- Free plan is quite limited — caps on AI queries and highlight storage push users toward paid tier quickly
- Pro plan at ~$15-20/mo feels expensive compared to alternatives like Readwise or Perplexity for what's offered
- AI answer quality is solid but noticeably behind ChatGPT or Perplexity for complex research questions
- No native Notion, Obsidian, or Roam export; getting highlights into a second brain tool requires manual work
- Recommendation feed can feel noisy and algorithmic rather than editorially curated
Pricing Details
| Pricing type | Freemium |
| Starting at | Free |
| Free plan | ✅ Available |
Plan Breakdown
Free
$0/mo
Pro
$14.99/mo
Team
Custom
See Current Pricing →
Pricing may change — always verify on the official site.
- Highlighting and saving key passages while doing academic or professional research online
- Using AI search to get quick, sourced answers without wading through full articles
- Building a personal knowledge base of annotated web content for later reference
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Alternatives to Liner
See how Liner compares side-by-side with similar tools
Liner Current |
Readwise Reader
|
Otio
|
ResearchRabbit
| |
|---|---|---|---|---|
| Rating | ★★★★☆ 3.8 | ★★★★½ 4.3 | ★★★★☆ 4.1 | ★★★★☆ 4.1 |
| Trust Score | 66/100 | 80/100 | 74/100 | 78/100 |
| Pricing |
Free
$0/mo
Pro
$14.99/mo
Team
Custom |
Free (Beta)
$0/mo
Readwise + Reader
$15.99/mo
Readwise + Reader (Annual)
$7.99/mo |
Free
$0/mo
Go
Free (7-day trial) |
Free
$0/mo |
| Data updated | 2 days ago | 2 days ago | 2 days ago | 2 days ago |
| Try → | Compare → | Compare → | Compare → |
About Trust Score
Trust Score = (Rating / 5 × 60) + (Popularity / 100 × 40). A score of 100 means the tool has a perfect rating and maximum market popularity. Scores are updated automatically by our AI agent.
Affiliate disclosure: Some links on this page are affiliate links. We may earn a small commission if you sign up — at no extra cost to you.
