Understand videos with bilingual captions, look up words without leaving YouTube, and review favorites with their original sentences.
Stay on the video, read a Chinese or English definition, then choose whether the word is worth saving.
.
Browse by recency or source video, then choose the group you want to study.
A consistent practice helps you remember useful expressions.
A consistent practice helps you remember useful expressions.
A consistent practice helps you remember useful expressions.
A consistent practice helps you remember useful expressions.
A consistent practice helps you remember useful expressions.
Read English subtitles with customizable styles on YouTube.
Keep the word, meaning, and subtitle sentence together, so every review starts from a familiar moment.
Open the mobile vocabulary library on your phone or computer, or add it to your home screen. Sign in with the same Google account in the browser and mobile vocabulary libraries to sync saved words and review progress. Review words when they are due to help you remember them.
Open mobile vocabulary libraryUse the extension on this device without signing in, or sign in to sync words and review progress. Offline changes sync when you reconnect. Daily new-word counts and display settings can be adjusted separately on each device.
Scan with your phone camera, or use the link below.
study.englishcc.comEnglishCC keeps the tools you need close to the video and leaves the rest out of the way.
Switch between bilingual, English-only, or separated bilingual captions, then choose a subtitle style that stays readable.
Hover a caption word to see a Chinese or English definition from the local dictionary.
Saved words are marked in future subtitles and kept with their original sentence and source video.
When timing is accurate, replay a sentence, loop it, or move directly to the previous or next one.
Authoritative Answers on YouTube Subtitles & Memory Science
Learn the mechanics of dual captions, the cognitive science behind FSRS, and frictionless context-based language acquisition.
The native YouTube player utilizes a single-stream caption architecture adhering to YouTube Closed Captioning standards (CEA-608 / CEA-708) and Google TimedText protocols. Within the default playback controls, viewers are forced to pick either the original English transcript or a machine-translated track. Selecting auto-translate overwrites the authentic English wording completely, preventing simultaneous comparative reading.
EnglishCC resolves this by establishing an in-situ rendering layer directly synced with video timecodes. It aligns the primary spoken English text with translation subtitles in a balanced visual hierarchy, including split-screen positioning where primary subtitles anchor at the bottom while secondary translations float unobtrusively above.
FSRS (Free Spaced Repetition Scheduler) is a next-generation spaced repetition scheduling algorithm rooted in modern cognitive science and statistical modeling. Unlike legacy heuristic algorithms such as SuperMemo SM-2 designed in the 1980s, FSRS formulates human memory using the three-component DSR model: Difficulty, Stability, and Retrievability.
By fitting memory decay curves to individual response ratings (Again, Hard, Good, Easy), FSRS predicts the optimal review interval just before memory recall probability drops below the desired threshold, reducing repetitive review workload by 20% to 30% while maintaining target retention.
Repeatedly pausing video playback to copy unfamiliar words into separate dictionary applications shatters acoustic immersion and cognitive flow. Furthermore, memorizing decontextualized dictionary entries yields poor long-term retention.
EnglishCC tokenizes subtitle sentences into responsive lexical units. Hovering your cursor over any word triggers an instant phonetic and definitional card within 100 milliseconds, automatically pausing playback for comfortable comprehension. Moving the cursor away resumes video playback immediately. Favoriting a word automatically archives the original sentence and precise video timestamp.
EnglishCC is built on local-first engineering principles. Subtitle rendering, lexical tokenization, and comprehensive dictionary lookups operate entirely within the user browser client. The extension is fully functional without user registration, and no tracking telemetry is collected on viewing activity.
For cross-device review on mobile devices, users may optionally sign in with Google OAuth. Cloud synchronization is strictly scoped to user-saved vocabulary entries, original context sentences, and FSRS interval schedules, transmitted securely over Cloudflare edge infrastructure without third-party advertising tracking.
Use the extension without an account and keep vocabulary on this device. When you sign in, vocabulary records (including meanings, source sentences and review progress) sync through EnglishCC to your account for use in the browser and mobile vocabulary libraries. Display preferences and watch-time statistics stay on this device.
