Captilex: Dual Subtitles & Flashcards for YouTube, Netflix, Meet

Learn a language from videos: see two subtitle lines, click any word to translate it, and review saved words as flashcards.

Captilex puts two subtitle lines on screen at once: the original and your own language. Use it on YouTube and Netflix, and get live caption translation in Google Meet and Microsoft Teams. Click any word to see its meaning and save it with the sentence it came from, then review your words with built-in flashcards. WHAT IT DOES • Dual subtitles on YouTube and Netflix: the original line and its translation, shown together. • Live caption translation in Google Meet and Microsoft Teams, with the speaker's name. • Click any word to translate it and save it with its sentence. • Flashcards with spaced repetition: review a few minutes a day and words move to longer intervals as you learn them. • 44 languages, including Spanish, French, German, Japanese, Korean, Chinese, Hindi, Tamil, Arabic, Persian, Hebrew, Greek and more. • Works out of the box, no API key needed: Chrome's built-in on-device translator, with free cloud translation as a fallback. KEYBOARD SHORTCUTS • Alt+A / Alt+D: previous / next line (YouTube) • Alt+R: replay the current line (YouTube) • Alt+P: pause after each line (YouTube) • Alt+S: turn Captilex on or off in this tab FREE AND PRO • Free: everything above, up to 100 saved words. • Pro (coming soon): unlimited saved words and CSV / Anki export. PRIVACY Captilex has no account and no tracking. Captions are only processed to translate them. Your settings and saved words stay in your browser. When Chrome's on-device translator can't handle a language, the line being translated is sent to the Captilex server for translation and is not stored. Pro payments, once available, are handled by a payment provider; Captilex never sees your card details.