According to AlphaMoat, as of 2026-09, the Chrome extension CogniTube has 79 users (-9.2% MoM), rated 5 (20 reviews) — ranked #4,610 of 9,324 AI browser extensions, and #958 of 1,839 in Office & Collaboration.
What is CogniTube
Turn any YouTube video into clear summaries, notes and bookmarks — without leaving YouTube. CogniTube uses AI to transform videos into structured summaries you can quickly understand — and lets you add notes and bookmarks to revisit what matters.
Perfect for podcasts, courses, interviews, tutorials, and lectures.
Key features ✅ Instant AI summaries – understand videos in seconds ✅ Timestamped key moments – jump to the most important parts ✅ Add notes to any video – capture insights while watching ✅ 3 summary styles – choose the level of detail you need ✅ Summaries in 15 languages – learn in your preferred language ✅ Personal video library – revisit your saved summaries, notes and bookmarks ✅ Dark mode – comfortable viewing for late-night learning
Full Pro access — free during beta
CogniTube is currently in beta. To give early adopters the full experience, we're giving everyone full Pro access for free — no credit card required, no catch.
- Unlimited AI summaries
- Access to Quick and Advanced summary styles
- Timestamped insights and deeper summaries
- Unlimited bookmarks and notes
- Personal video library — revisit everything you've saved
- Cloud storage & sync across devices
- Choose your preferred summary language
- Priority Support
- Early access to new features
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How to use 1. Install CogniTube 2. Open any YouTube video 3. Click the CogniTube icon in the YouTube sidebar 4. Generate your AI summary instantly 5. Save key moments and add notes as you watch
No extra tabs. No copy-pasting. Everything happens inside YouTube.
Ideal for students, researchers, podcast listeners, busy professionals, and anyone who wants to learn through YouTube.
Frequently Asked Questions Q1: Does CogniTube work on any YouTube video? A1: Yes. CogniTube works on most YouTube videos that include transcripts. Q2: Where are my summaries and notes stored? A2: Your summaries, bookmarks and notes are stored locally in your browser by default. With CogniTube Pro, you get cloud storage and sync across devices. Q3: How does the beta period work? A3: During our beta, all users get full Pro access for free — unlimited summaries, bookmarks, and cloud sync. This is our way of saying thank you to early adopters. Q4: Does CogniTube collect personal data? A4: No. CogniTube only processes the video transcript required to generate summaries. We do not store or sell personal data. Q5: Can I choose the language of the summary? A5: Yes. CogniTube supports 15 languages, so you can read summaries in your preferred language.
Extension profile
User Growth Trend
Popular in Office & Collaboration
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Data month: 2026-09 · User counts and ratings come from public Chrome Web Store data, aggregated monthly. See methodology.