Sidecap

Learn languages faster with interactive YouTube captions - click words for definitions, translations, and clean caption history.

Sidecap adds side captions to YouTube videos, letting you interact with captions directly instead of pausing, rewinding, or switching tabs. Click on any word to see its meaning, translation, and usage - all inline, without interrupting playback.

What Sidecap does
• Click words in captions to see definitions and translations
• Automatically replay the last few seconds for context
• Build a clean, readable caption history as the video plays
• Switch between learning and translation modes
• View captions in a lightweight sidebar alongside the video

Designed for language learning

Sidecap is built for learners who want to stay immersed:
• No intrusive pop-ups
• No cluttered translation panels
• Just clear explanations, right when you need them

Privacy-first

Sidecap runs locally in your browser.
• No accounts
• No tracking
• No data collection

Supported languages

English, French, Spanish, Italian, German

Currently supports YouTube captions.