SubLingo: Vocabulary Builder

Spaced-repetition flashcards for serious language learners. Memorize vocabulary in any of 8 languages with FSRS — the modern successor to the Anki algorithm — and review every word at the exact moment you're about to forget. No more grinding word lists you already know. No more relearning the same word three times. Just consistent, science-backed vocabulary growth — in any language you're learning.


WHY SUBLINGO IS DIFFERENT

• Spaced repetition done right. SubLingo runs FSRS-5 — the same algorithm trusted by Anki and Duolingo — and personalizes every review interval to your own memory curve.

• Words from real content. Pair the app with the free SubLingo browser extension to capture words straight from Netflix, YouTube, TED, and Coursera subtitles, with the original sentence and timestamp attached.

• Daily-review habit, enforced by you. Turn on Forced Review and SubLingo will quietly lock the apps you choose (or overlay your unlock screen on Android) until your due cards are done. Adult-only, opt-in, off whenever you want.

• Free where it matters. Unlimited reviews, full FSRS, Anki export — free. Premium only adds cloud sync, larger libraries, and customization.


SEVEN WAYS TO REVIEW

Different exercises hit different parts of memory. SubLingo rotates through:

1. Translation Recognition — multiple choice, beginner-friendly
2. Listening Recognition — train your ear using your device's text-to-speech
3. Context Cloze — fill the blank in the sentence you saw it in
4. Fill in the Blank — type the word from memory
5. Translation Production — type the meaning
6. Reverse Production — type the word in your target language
7. Image Recognition — associate the word with a visual cue

Cards move through five mastery stages: New → Learning → Young → Mature → Mastered. The algorithm always serves the cards you're closest to losing.


KEY FEATURES

• FSRS-5 spaced-repetition scheduler
• 7 exercise modes for every level
• Tap-to-hear pronunciation on every card (uses your device's text-to-speech)
• Image-based cards via Pixabay
• Daily review reminders (opt-in)
• Lock-screen review overlay (Android)
• Screen Time focus mode (iOS) — block distractions until you study
• Anki, CSV, and TSV export — your data is yours
• Search, filter by mastery, edit any card
• Streaks and progress dashboard
• Local-first storage — works offline
• Dark mode, neumorphic UI


SUPPORTED LANGUAGES

English, Spanish, French, German, Japanese, Korean, Chinese, Vietnamese — with pronunciation playback powered by your device's built-in text-to-speech. The companion browser extension supports 48+ languages for capture.


PREMIUM

Most learners never need to upgrade. Premium adds:

• Cloud sync across devices
• Unlimited vocabulary library (free tier holds 100 words)
• Unlimited hover translations in the extension
• Custom subtitle styles in the extension
• Website blocker (Focus Mode) in the extension

Plans:
• $4.99 / month, cancel anytime
• $99 lifetime — one payment, forever (limited-time launch price)


PRIVACY-FIRST

Your vocabulary lives on your device by default. Cloud sync is opt-in and only activates after you sign in. We never sell your data. Account deletion is one tap inside the app, or via sublingo.pro/delete-account.html.


WHO IT'S FOR

• Language learners watching foreign-language shows on Netflix, YouTube, or TED
• Self-studying polyglots looking for an Anki replacement that doesn't feel like 1998
• Students preparing for JLPT, TOPIK, HSK, DELE, DELF, Goethe, or TOEFL
• Anyone who wants 5 productive minutes of vocabulary review every day, without thinking about it

Pair SubLingo with the free browser extension at sublingo.pro and turn every minute of streaming into language learning.

Questions, feature requests, or bug reports: support@sublingo.pro
Privacy policy: sublingo.pro/privacy
Terms of service: sublingo.pro/terms

Recent changes:
• Fixed the price on the Premium screen — some regions saw the currency symbol twice, or the wrong currency.
• Updated for Android 16.
• Polish and bug fixes.