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Caption Harbor

ExtensionEducation
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Overview

Learn from YouTube with bilingual captions, audio transcription, Eudic vocabulary, AI questions, and notes.

Learn from the videos you actually watch. Caption Harbor turns YouTube and Bilibili into a language-learning workspace: real captions, audio transcription for videos without subtitles, AI digests, instant word lookup, and vocabulary sync to Eudic. FEATURES • Captions and transcripts on YouTube and Bilibili — original, translated, or bilingual view • Audio transcription for videos that have no subtitles at all (cloud via Groq/Supadata, or free local Whisper) • Click any word for definitions, usage explanations, and concept notes • Save vocabulary straight into your Eudic (欧路词典) wordbook • AI summaries, chapter outlines, and ask-questions-about-the-video • Timestamped notes, searchable transcripts, playback follow-along • Sentence-level segmentation tuned for real spoken language YOUR KEYS, YOUR DATA • Open source (MIT), forked from Zara Zhang's YouTube Digest • Bring your own API keys — stored locally on your device only • No account, no tracking; transcripts, notes, and vocabulary never leave your machine NOTES • Audio transcription needs a small companion installer (yt-dlp + ffmpeg) — see the README on GitHub • AI and cloud transcription features require your own API keys; local Whisper transcription is free

Details

  • Version
    2.1.4
  • Updated
    September 22, 2026
  • Size
    5.46MiB
  • Languages
    English
  • Developer
    Email
    vinceliu127@gmail.com
  • Non-trader
    This developer has not identified itself as a trader. For consumers in the European Union, please note that consumer rights do not apply to contracts between you and this developer.

Privacy

Manage extensions and learn how they're being used in your organization

Caption Harbor has disclosed the following information regarding the collection and usage of your data. More detailed information can be found in the developer's privacy policy.

Caption Harbor handles the following:

Authentication information
Web history

This developer declares that your data is

  • 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
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