Powerful Features forEffective Learning
Zen Kana combines cutting-edge technology with proven learning methodologies to create the most effective Japanese writing system practice app.
Spaced Repetition Algorithm
Scientific learning optimization
Our implementation of the proven SuperMemo 2 (SM-2) algorithm ensures you practice exactly when your brain needs reinforcement.
- Intelligent scheduling based on your performance
- Automatic difficulty adjustment for each character
- Optimal review intervals for maximum retention
- Priority-based item selection for efficient learning
Voice Recognition & TTS
Perfect your pronunciation
Advanced voice input and text-to-speech technology helps you master Japanese pronunciation from day one.
- Speech-to-text for answer input with error handling
- Japanese text-to-speech for pronunciation practice
- Automatic language detection (Japanese vs English)
- Enhanced error recovery and automatic retry
Comprehensive Content
Complete Japanese foundation
Everything you need to master Japanese writing systems and build a solid vocabulary foundation.
- 125 Hiragana characters including combinations (きゃ, しゃ, etc.)
- 125 Katakana characters with voiced variants
- 477 JLPT N5 vocabulary words in 18 optimized categories
- Difficulty-based presets from Beginner to Expert
Advanced Analytics
Track your progress in detail
Comprehensive statistics and analytics help you understand your learning patterns and optimize your study time.
- Detailed accuracy rates and response time tracking
- Individual item performance with learning phases
- Session summaries with contextual encouragement
- Historical dashboard with performance trends
Flexible Learning Modes
Learning Mode
Structured introduction with character familiarization, study cards, and progressive revelation before testing. Perfect for beginners or when learning new characters.
Practice Mode
Interactive testing with immediate feedback, voice input, and spaced repetition scheduling. Ideal for reinforcing knowledge and building long-term retention.
Available Across All Your Devices
Cross-Device Sync
Your progress, preferences, and statistics automatically sync across all devices using Firebase.
Session Persistence
Resume practice sessions exactly where you left off, even after closing the app.
Accessibility First
Customizable text scaling, voice features, and GDPR-compliant privacy controls.
Ready to Start Your Japanese Journey?
Experience all these powerful features and start mastering Japanese writing systems today.