Sentence Listening Console

Mark sentence boundaries while a video plays, then jump back, loop difficult parts, and see your practice progress.

Sentence Listening Console turns Bilibili and YouTube videos into focused, sentence-by-sentence listening practice with cloud sync and mobile support. It works without relying on subtitle APIs. Mark sentence boundaries while a video plays, then jump back, repeat difficult parts, and practice at your own pace. Use it for English, Japanese, German, Chinese, or any other language you want to train. Get started in three steps: 1. Open a supported video and start playback. 2. Click the green "Mark sentence" button whenever a sentence ends. 3. Click any saved sentence to replay it, or choose a loop mode for focused practice. Key features: - Create your own sentence markers without platform subtitles - Jump between sentences and control playback from one compact console - Use single-sentence, multi-play, sentence-pause, or range-loop modes - Add flexible color markers to individual sentences for mastery tracking - Sign in to sync your marked sentences and learning statistics across devices - Scan QR codes to continue listening on your mobile device - Automatically switch between Chinese and English based on browser language - Save records locally and import or export your data - Reopen previously marked videos from listening history - Review comprehensive learning stats: playback time, repetitions, speed distribution, and daily trends Privacy and Data: By default, sentence markers and learning statistics are stored locally in your browser. When you sign in (optional), your data syncs securely to your personal Supabase account via HTTPS encryption, allowing cross-device access. You have full control over your data and can export or delete it at any time. No data is sent to developer-operated tracking or analytics servers. The extension only accesses video pages on Bilibili and YouTube to provide its core features, and Supabase domains when cloud sync is enabled. Disclaimer: This independent extension is not affiliated with or endorsed by Bilibili, YouTube, Supabase, or their parent companies.