According to AlphaMoat, as of 2026-09, the Chrome extension Ytsum has 111 users (+14.4% MoM), rated 5 (2 reviews) — ranked #4,048 of 9,324 AI browser extensions, and #992 of 2,418 in General AI.
What is Ytsum
Summarize YouTube Videos. Get direct links to key points in the video. Easily and automatically summarize YouTube videos.
Bring your own Claude API key, which you can get from https://platform.claude.com
In addition to summaries, this extension gives you:
- Direct answers to the promises made in video titles and often in the first few seconds to keep you hooked
- Direct timestamped links to key points in the video so can get to the actual meaningful stuff faster
- Spam, trust, and relevance scores to help gauge if a video is actually worth your time to watch
- A copy button to get the full transcript in one click. You can then paste and analyze it in any tool you'd like.
Setup instructions:
- Click the extension icon in Chrome's toolbar next to the address field, then click Ytsum
- Enter your API key (get it from https://platform.claude.com), and agree to terms
- Extension will add a box below the video on youtube video page
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Version history
1.8.0
- Transcript extraction logic revamp
1.7.1
- Support for new video urls
- Transcript fetch logic improved
1.7.0
- Fixed transcript extraction since the youtube DOM keeps changing. Added heuristics that should work a little more reliably on various versions of the interface. As always, if you notice anything wrong, do let us know.
1.6.0
- Updated model selection, with a custom option so you can type in the Anthropic model you want to use when they release new ones
- Fixed bugs and made to work with the new transcript box that is being A/B tested currently
- Option to cache transcripts & analyses locally
Extension profile
User Growth Trend
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+ CompareData month: 2026-09 · User counts and ratings come from public Chrome Web Store data, aggregated monthly. See methodology.