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Free, no-signup spaced-repetition flashcard app for language and general learning, using the SuperMemo SM-2 algorithm.

9.1K saves
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Language REACTOR
✓ verifiedFreemium

Browser extension that adds dual subtitles and click-to-lookup to Netflix and YouTube for learning languages.

1.7M visits/mo
Pricing
Free: €0 (unlimited words, sets, and flashcards)

No public pricing

Core features
  • Spaced repetition scheduling (SuperMemo SM-2)
  • No account required, local browser storage
  • Offline access to flashcards
  • Audio pronunciation support
  • Progress tracking and statistics
  • Optional AI translation and writing correction (bring-your-own API key)
  • Dual subtitles on Netflix and YouTube
  • Click-to-lookup word translations
  • Saveable vocabulary items
  • Playback controls for language study
  • Works as a browser extension
Use cases
  • Self-directed language learners building custom vocabulary decks
  • Students studying any subject with spaced repetition
  • Learners wanting offline-capable flashcards without an account
  • Users wanting AI-assisted translation while building flashcards
  • Learn a language while watching shows
  • Look up and save new words from video
  • Study with dual subtitles
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