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Description
Rolling YouTube subtitles with instant word lookup, CEFR difficulty levels, inline translation, and vocabulary notebook. Rolling YouTube subtitles with instant word lookup, CEFR difficulty levels, inline translation, spaced-repetition review, and a vocabulary notebook. Learn English from the videos you already love. YouTube Subtitle Sidekick transforms every YouTube video into a powerful English learning tool. Instead of passively watching, you actively learn — one word, one sentence, one video at a time. How it works While you watch, the extension displays rolling subtitles in a sidebar next to the video, automatically highlighting the current line as it plays. Click any unfamiliar word to instantly see its definition, phonetic spelling, and hear its pronunciation — without leaving the page. Built for serious learners Instant word lookup — Click any word for definitions from Wiktionary and the Free Dictionary API CEFR difficulty levels — Words are color-coded by difficulty (B1, B2, C1, C2) so you know exactly what you're learning Inline translation — Translate any subtitle line into your language with one click (12 languages, default Chinese) Vocabulary notebook + SRS — Save words and sentences with context and personal notes, then review them with built-in spaced-repetition (Again / Good / Easy) and a multiple-choice quiz. Export to CSV, Anki, or HTML Vocabulary lists — Organize saved words into separate lists to study by topic, video, or level Coverage meter — See at a glance what % of a video's unique words you already know, and set your "I know ≤" level to track progress Sentence replay — Jump back to the exact moment a word appeared, or play just that sentence Comprehension mode — Blur the subtitles to test your listening skills A/B loop — Repeat any subtitle line automatically for shadowing practice