Ytsum: Summarize YouTube Videos

Tracking since Apr 7, 2026.

Changelog

• May 3, 2026
  description

  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
  
  
  Version history
  
  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

  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
  
  
  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

• Apr 26, 2026
  description

  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
  
  
  Version history
  
  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

  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
  
  
  Version history
  
  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

• Apr 19, 2026
  description

  This extension allows you to easily and automatically summarize YouTube videos using your own Claude API key, which you can get from https://platform.claude.com
  
  Also gives you a copy button to easily get the full transcript so you can analyse it in any tool you choose.
  
  Instructions:
  - Click the extension icon, 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
  
  Version 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

  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
  
  
  Version history
  
  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

Permissions & access

Permissions

storageunlimitedStoragedeclarativeNetRequest

Host access

https://api.anthropic.com/*

Screenshots

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