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Sigmajp
Sigmajp is an e-book reader application that provides an instant dictionary and flash cards for reading Japanese books.
Sigmajp is a reading and study application designed for people learning Japanese. It combines an e-book reader, a dictionary, and spaced repetition flash cards into a single tool without complex setup. Users can tap any word to view definitions and conjugations instantly, or get full sentence breakdowns including subclauses and grammar notes. The app supports adding private EPUB files, reading text vertically or horizontally, and viewing kanji stroke orders with a writing pad. Flash cards automatically save the sentences where words were encountered and use the FSRS-6 spaced repetition algorithm. It works offline and syncs across devices, with no initial sign-up required to read and use the dictionary.
Sigmajp at a glance
- Best for: Student
- Runs on: Web
- Pricing: Free plan available; unpaid account required to save and study flash cards.
- Released: November 2026
- Category: AI writing tool
- Website: sigmajp.works
Key features
- Instant dictionary lookups on tap
- Sentence explanations with grammar notes
- Spaced repetition flash cards using FSRS-6
- Writing pad for practicing kanji strokes
- EPUB file upload and private storage
- Vertical and horizontal reading modes
- Cross-device auto-syncing and offline support
- CSV export for flash cards
Use it for
- Reading Japanese books and novels with a tap-to-look-up dictionary
- Studying Japanese sentence structures and grammar notes
- Reviewing vocabulary with spaced repetition flash cards
- Practicing kanji writing on a built-in writing pad
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