PrimeVocab: Dual Subtitles on Android & Desktop by PrimeVocab

🎬 Dual subtitles for YouTube, Netflix, Prime Video & more on PC and Android – learn while you watch!

PrimeVocab is a language-learning extension and vocabulary builder. It shows bilingual subtitles (two subtitles at once), works as a click-to-translate subtitle translator and turns the words you save into spaced-repetition flashcards and games. Learn English – or any of 22 languages – from the series, movies and videos you already love. Works on your computer and in Firefox for Android.

✨ Why PrimeVocab?
• Dual subtitles on your phone, too: YouTube and Prime Video in Firefox for Android.
• Two subtitles at once – even YouTube's auto-generated subtitles, shown as complete sentences.
• Click any word to translate it and save it together with the scene.
• Flashcards, games and shadowing turn saved words into vocabulary you keep.
• 22 languages, free to start.

📺 Supported platforms
• On your computer: YouTube, Netflix, Prime Video & web videos
• On Android phones and tablets: YouTube, Prime Video & web videos

📱 Dual subtitles on your phone (Firefox for Android)
• Tap a word in the subtitles to see its translation and save it.
• Buttons on the edge of the player for quick settings, replaying the sentence and cinema mode.
• Manage your languages, subtitle style and saved words on a light settings page.

👥 Who is it for?
• Anyone preparing for IELTS or TOEFL, or improving everyday English.
• Learners of any of 22 languages, from Spanish and German to Japanese and Korean.
• Anyone who wants real-life words, idioms and phrasal verbs from the shows they watch.

🌐 Dual subtitles & subtitle translator
• Uses official translated subtitles when available, otherwise Google Translate – also for auto-generated subtitles.
• Click any word: translation, pronunciation and, for English words, the A1–C2 level and synonyms.
• Highlights idioms, phrasal verbs and collocations in English subtitles; multi-word phrases you save are highlighted as one unit.
• Cinema mode on Netflix and Prime Video hides the player's buttons and can also hide Prime's X-Ray (IMDb) panel.

🧠 Smart playback (Premium)
• Shadowing: the video pauses after each sentence so you can repeat it out loud.
• Smart shadowing: pauses only on sentences with C1/C2 words, words you marked hard, idioms or phrasal verbs.
• Auto rewind: goes back 2–8 seconds when you save a word, so you hear it again in context.
• Auto slow motion: plays at 0.5×–0.9× when saved words of the levels you choose appear.

🃏 Spaced repetition flashcards (Anki-style)
• Rate each card Again, Hard, Good, Easy or Learned; review intervals adapt to you.
• Daily new-card and session limits keep reviews manageable.
• 12-week study heatmap, daily goal and streak.

🎮 6 mini-games
• Multiple choice, fill in the blank with the sentence from your show, word scramble, matching, dictation and memory cards.
• Practise everything you saved, only single words or only collocations.

🏆 Badges
Earn badges such as Phrasal Guru, Idiom Hunter, Idiom Sage and Collocation Architect as your vocabulary grows.

🗂 Your personal dictionary
• Every word keeps its sentence and video moment – replay the scene with one click.
• Organise words with tags.
• Export to CSV for Anki, or back up and restore everything as a JSON file.

💎 Free and Premium
• Free: dual subtitles, translations, save up to 50 words, flashcards and games.
• Premium: unlimited words; smart playback (Shadowing – pause after each sentence to repeat it, rewind when you save a word, slow down on hard words) and sync across your devices through Google Drive.

⌨ Keyboard shortcuts (computer)
• Alt+Shift+K opens or closes the panel.
• Move between subtitle words, save a word and resume the video from the keyboard – every key can be changed.

🔒 Privacy
Your words and settings are stored in your browser. Sync is optional and uses your own Google Drive. No ads.