Overview
Liner AI — Your AI research co-pilot
Liner is a web highlighter and AI research assistant used by over 8 million users. It lets you highlight text on any webpage or PDF, then uses AI to summarize, explain and cross-reference your saved highlights into a searchable knowledge base.
Web & PDF highlighting
AI summarization of highlights
Personal knowledge base
Chrome & Safari extensions
Features & capabilities
Everything it does, in plain English.
FeatureWeb & PDF highlightingIncluded
FeatureAI summarization of highlightsIncluded
FeaturePersonal knowledge baseIncluded
FeatureChrome & Safari extensionsIncluded
FeatureChat with your saved contentIncluded
PlatformsWeb · Chrome Extension · Safari Extension
The honest take
Where it shines, where it stumbles.
✓ Pros
- ✓8M+ users
- ✓Works on any website
- ✓Free tier is generous
! Watch-outs
- !AI features require premium
- !Mobile app less capable
Who it's for
Where Liner AI pays for itself fast.
— Use case
Academic research
— Use case
Content curation
— Use case
Studying
— Use case
Competitive research
Community reviews
Share your take on Liner AI
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P
★★★★★
2 months ago
Exceptional quality and value
Exceeded all my expectations. The onboarding flow was smooth and I was productive from day one. Works consistently across all my devices and browsers. The API is well-documented and easy to work with. Five stars — no hesitation.
P
★★★★★
3 months ago
Happy with my subscription
Does what it promises and does it well. The accuracy has improved significantly with recent model updates. Works consistently across all my devices and browsers. Five stars — no hesitation.
P
★★★★★
3 months ago
Incredible — highly recommend
Can't imagine working without it now. The onboarding flow was smooth and I was productive from day one. It integrates well with VS Code / Slack / Notion — my daily drivers. It integrates well with VS Code / Slack / Notion — my daily drivers. Definitely worth trying.
C
★★★★★
5 months ago
Very useful, mostly polished
Genuinely useful — glad I tried it. The ROI was clear within the first week of using it. The outputs require minimal editing — saves so much back-and-forth. Customer support responded within hours and solved my issue. A staple in my tech stack now.
P
★★★★★
6 months ago
The best product I've used
Can't imagine working without it now. I've recommended this to at least 10 colleagues already.
C
★★★★★
6 months ago
Strong product overall
Mostly great, minor complaints. Integration with my existing tools was seamless — no friction at all. Would recommend to anyone in my industry.
V
★★★★★
6 months ago
Exactly what I needed
Game changer for my workflow. The collaboration features are genuinely well thought-out.
H
★★★★★
9 months ago
Best in class, no question
Absolutely love this tool. The outputs require minimal editing — saves so much back-and-forth.
B
★★★★★
9 months ago
Mixed experience overall
Mixed feelings, but ultimately positive. It handles edge cases better than anything else I've tried. Pricing is fair for the value you get. A few missing integrations I'd like to see added.
J
★★★★★
9 months ago
Worth every cent
Worth every penny. The collaboration features are genuinely well thought-out. Integration with my existing tools was seamless — no friction at all. My team is very happy with the results.
L
★★★★★
1 years ago
Changed how I work completely
This is exactly what I was looking for. The API is well-documented and easy to work with. My team adopted this immediately after I shared it with them. Performance is fast — no noticeable latency even on large inputs. Definitely worth trying.
K
★★★★★
1 years ago
Mixed experience overall
Decent tool, not without issues. Reduced the time I spend on this task by about 70%.
W
★★★★★
1 years ago
A must-have for any professional
Absolutely love this tool. I've tried 5 similar tools and this one is clearly the best in class. The customization options let me tailor it to my exact workflow.
T
★★★★★
1 years ago
Great tool, minor quibbles
Good value for the price. The collaboration features are genuinely well thought-out. A few missing integrations I'd like to see added.
V
★★★★★
1 years ago
Incredible — highly recommend
Seriously impressive. The ROI was clear within the first week of using it.
N
★★★★★
1 years ago
Not worth it for me
Disappointed with the experience. Integration with my existing tools was seamless — no friction at all. Customer support response times could be faster.
A
★★★★★
1 years ago
Good value, works well
Mostly great, minor complaints. Works consistently across all my devices and browsers. A few missing integrations I'd like to see added. My team is very happy with the results.
L
★★★★★
1 years ago
Good for some things, not others
Useful but frustrating at times. Works consistently across all my devices and browsers. I've tried 5 similar tools and this one is clearly the best in class.
V
★★★★★
1 years ago
Best in class, no question
Game changer for my workflow. Integration with my existing tools was seamless — no friction at all. The interface is intuitive enough that I didn't need to read any docs. The ROI was clear within the first week of using it. My team is very happy with the results.
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