CaptionTwin – Shadowing Like Music: Your Videos, Whole Sentences, Scores

YouTube bilingual subtitles, spoken-word highlights, and private speaking practice with rhythm, intonation and linking scores.

Learn a language the way you learn music. Pick a video you actually like, and CaptionTwin turns it into sentence-by-sentence shadowing practice: whole-sentence bilingual subtitles, a Take button to speak along with the original, and scores for your rhythm, intonation and linking. - Read complete sentences with a translation beside the original. Spoken words light up as the video plays; timing comes from the available caption track and can be estimated. - Click a word to replay from that point. Double-click a word for translation, available dictionary meanings and read-aloud; select a phrase for translation. - Use ‚Üê / ‚Üí to replay or move between sentences. Press ‚Üê twice quickly to go back one sentence. Keyboard controls respect text fields, and sentence arrows can be disabled. - Press Take to speak with the original or try Solo on the paused picture. On first use, allow the microphone on CaptionTwin's extension page, return to the same sentence, then press Take when ready. - Listen back in yours ‚Üí original order. Compare rhythm, intonation and linking against the original; scores describe timing and melody, not speech recognition or pronunciation certification. Silent or incomplete recordings may have no score. - Save captioned videos to the local Library, resume your sentence, and review takes on this computer. Signed-in accounts (free) can sync small video/progress records through Chrome sync; recordings and full captions stay local. - Choose Auto, Google, Microsoft or On-device only translation. Online translation sends caption/selected text to the provider. What works - Version 1.0 supports YouTube videos with captions. Live streams and the miniplayer are not supported; ads pause practice until the video returns. - Languages that separate words with spaces (English, Spanish, French, German, Portuguese, Russian, Vietnamese and others) get every feature. Chinese, Japanese and Thai videos get whole sentences, translation, Take and scoring, but no per-word highlight, word click or word lookup. - Translation targets: English, Chinese, Japanese, Korean, Spanish, French, German, Portuguese, Russian, Hindi, Arabic and Vietnamese. - The interface is in English. - Recordings and scoring stay on your computer. Use headphones for a cleaner comparison. No account is needed for local practice. The extension contains no analytics or usage tracking. The bundled side panel also offers user-invoked bilingual reading and saving of ordinary web articles.