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FR-AI / ANALYSISWhy it is worth attention
It offers a privacy-focused, no-backend solution for language learners to interact with subtitles in real time, integrating vocabulary saving and multiple translation options directly in the video player.
Who it is for
- Language learners who watch movies or series
- Chrome users on Amazon Prime Video or Kino.pub
- Self-study learners wanting to build vocabulary from media
Use cases
- Watching foreign films with dual subtitles to improve listening
- Clicking unfamiliar words to see translations instantly
- Saving useful words to a private vocabulary list for later review
- Exporting vocabulary as CSV or JSON for external study tools
Strengths
- Dual subtitles with original and translated lines
- Click-to-translate directly on the subtitle overlay
- Private vocabulary stored entirely locally in Chrome
- Privacy-first design with no developer backend or telemetry
Considerations
- Currently only supports Amazon Prime Video and Kino.pub
- Online translation features depend on Chrome built-in, LibreTranslate, MyMemory, or a user-provided DeepL API key
- Extension is limited to Chrome browser and requires developer mode for local testing
README quick start
Dual Subtitles: Learn Languages with Movies
Dual Subtitles is a free Chrome extension for watching films and series with two subtitle lines: the original subtitle line and a translation underneath it.
It is built for language learners who want to stay inside the video player: click words, translate them, and save useful words to a private vocabulary book.
Supported Sites
- Amazon Prime Video
- Kino.pub
You can vote for more supported websites on the project website: https://www.y-markov.com/dual-subtitles/vote
Features
- Dual subtitles: original line plus translated line.
- Click-to-translate words directly in the subtitle overlay.
- Private vocabulary book stored locally in Chrome.
- CSV and JSON vocabulary export.
- Chrome built-in translation when available.
- Optional online fallback translators: LibreTranslate and MyMemory.
- Optional DeepL support with the user's own API key.
- Subtitle size, position, timing offset, and language settings.
Privacy
The extension has no developer backend and does not collect analytics or telemetry.
Settings and vocabulary are stored locally with chrome.storage.local. When Chrome built-in translation is available, translation is handled by Chrome. If an online translator is selected, only the text being translated is sent to that selected service.
See PRIVACY.md for details.
Project Structure
extension/ Chrome extension source
website/ Static project website pages
store-assets/screenshots/ Chrome Web Store screenshots
scripts/ Release helper scripts
CHROME-STORE-DESCRIPTION.* Store listing copy
STORE-NOTES.md Store submission notes
PRIVACY.md Privacy policy
LICENSE License
Local Development
- Open
chrome://extensions. - Enable Developer mode.
- Click Load unpacked.
- Select the
extensionfolder. - Open Amazon Prime Video or Kino.pub and start a video with subtitles.
After editing the extension, reload it on chrome://extensions and refresh the video page.
Build a Store Package
Run from the repository root:
powershell -NoProfile -ExecutionPolicy Bypass -File .\scripts\build-extension-zip.ps1
The script creat
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