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Ytsum: Summarize YouTube Videos

Magille Oy
5.0(

2 ratings

)
ExtensionTools101 users
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Overview

Summarize YouTube Videos. Get direct links to key points in the video.

No subscription needed. Use your Anthropic API key & Claude 3.5 Sonnet to summarize YouTube videos. Feedback welcome 🙏 hi@ytsum.io Instructions: - Click the extension icon and enter your Anthropic API key (which you can get here: https://www.anthropic.com/api) - Open a YouTube video, scroll down a little, the extension box should appear above the comments section - Click fetch transcript (if auto fetch is enabled you can skip this step) - Click analyze transcript (this does not happen automatically) Note: - Token counter is slightly off (in general the estimate is higher than the actual usage) - Fails sometimes, if the response from the API isn't perfectly formed - Does not work with extremely long videos due to token limits Changelog: 1.05 update model to claude sonnet 4.5

Details

  • Version
    1.05
  • Updated
    November 8, 2025
  • Size
    72.79KiB
  • Languages
    English
  • Developer
    Magille Oy
    PO Box 1385 HELSINKI 00101 FI
    Website
    Email
    hi@ytsum.io
    Phone
    +358 50 4367339
  • Trader
    This developer has identified itself as a trader per the definition from the European Union and committed to only offer products or services that comply with EU laws.
  • D-U-N-S
    539862202

Privacy

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  • Not being sold to third parties, outside of the approved use cases
  • Not being used or transferred for purposes that are unrelated to the item's core functionality
  • Not being used or transferred to determine creditworthiness or for lending purposes

Support

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