Couplet: Dual Subtitles to Learn Languages on YouTube

Free dual subtitles for YouTube. Click a word for its meaning, save it, and review it in the sentence you heard it in.

Learn a language from the YouTube videos you already watch. Couplet shows dual subtitles, gives you the meaning of any word you click, and brings saved words back in the sentence you heard them in. Free to use. WATCH WITH DUAL SUBTITLES • See the original above your language, with no need to turn on captions • Works on videos with subtitles, including auto-generated ones • Move and resize the subtitles, or show the lines before and after • Hide the translation to test yourself LOOK UP WITHOUT LEAVING THE VIDEO • Click a word for its meaning, phonetics, and example sentences • Hear it spoken • Drag across a phrase to translate it, even across two lines • The video can pause while you read KEEP WHAT YOU MEET • Save a word or phrase with one click • Each one keeps its sentence, the lines around it, and the moment in the video • Your list syncs between your computers, and exports as a CSV REVIEW IN CONTEXT • Saved words come back on a schedule, from ten minutes to two months • One click returns to the exact moment in the video • See your streak, your progress, and what needs more practice ASK AI WHEN A SENTENCE STAYS UNCLEAR • In your word list, get two or three sentences on meaning and grammar • 50 explanations a day LANGUAGES Learn English, Spanish, French, German, Portuguese, Italian, Japanese, or Korean, with translations into 22 languages. ACCOUNT AND PRIVACY Subtitles and lookups work without an account. To save and review, sign in with Google. Couplet is an independent product, not affiliated with YouTube or Google.