A French language learning app for Android that lets you scan physical books, read them on your phone, and build vocabulary through flashcards and spaced repetition.
Scan → Read → Learn
- Scan — Point your camera at a book page. Lumi uses Gemini Vision to extract the text, handling curved pages, varied lighting, and complex layouts.
- Read — Pages are stored in your library organized by book. Tap any word for an instant French→English translation with grammar context. Long press a sentence to translate the whole thing.
- Learn — Save words to flashcards with one tap. Review them with a spaced repetition system (SM-2) that schedules cards based on how well you know them.
- Book library — Organize scanned pages into books. Scan one page at a time and build up a book over multiple sessions.
- Gemini Vision OCR — AI-powered text extraction that understands document structure and reading order, far more accurate than traditional OCR on curved book pages.
- Tap-to-translate — Tap any word for a contextual translation and part-of-speech breakdown. Long press for full sentence translation.
- Flashcard SRS — Words are saved with the sentence they came from, so flashcards show context not just isolated vocabulary. Swipe right to pass, left to fail.
- Roadmap — Built-in French grammar learning path (in progress).
- Kotlin + Jetpack Compose
- CameraX for camera capture
- Gemini API (
gemini-2.5-flash-lite) for OCR and translation - Room for local persistence
- SM-2 spaced repetition algorithm
- Clone the repo
- Add your Gemini API key to
local.properties:GEMINI_API_KEY=your_key_here - Build and run on a physical Android device (API 26+)
Active development. Grammar lessons coming soon.