Tsugi - Japanese Vocab Mining
Smart n+1 Sentence Flashcards
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
KeitaiTango is now Tsugi! Super-charge your Japanese immersion with AI-powered n+1 sentence mining, advanced local tokenization, and optimized SRS review decks.
Tsugi (次) is the next-generation AI Japanese immersion and sentence mining platform. Built for intermediate to advanced learners who have outgrown basic language apps, Tsugi turns native Japanese content into your own personalized, high-yield Spaced Repetition System (SRS) study ecosystem. Whether you’re studying for the JLPT or pursuing real-world fluency, Tsugi helps you learn from authentic Japanese.
Key Features:
- AI-Powered n+1 Sentence Mining: Automatically analyze any complex Japanese sentence. Tsugi identifies the exact grammar patterns and vocabulary matching your current level, instantly isolating the single unknown word (n+1) for highly efficient acquisition.
- Instant Text Analysis & Local Tokenization: Powered by lightning-fast, privacy-first local processing, our advanced tokenizer instantly breaks down native sentences into nouns, verbs, particles, and conjugations with precise definitions.
- Super-Charged SRS Algorithm: Move past rigid legacy apps. Our optimized spaced-repetition engine adapts dynamically to your personal forgetting curve, resurfacing weak cards right before you forget them.
- Native Audio & Interactive Furigana: Perfect your accent with high-quality audio output designed for pitch-accent training and shadow reading. Toggle furigana and hiragana overlays instantly based on your target Kanji comfort level.
- Comprehensive Progress Analytics: Track your journey toward true literacy. Visualize your vocabulary growth, card retention curves, and daily study streaks with deep statistical insights.
- Smart Reminders: Never break your streak. Customizable daily notifications ensure your reviews are cleared on time, keeping your SRS engine perfectly optimized.
Take the next step in your language journey. Move beyond gamified apps and start mining your way to true fluency with Tsugi.
Please follow us on Twitter/X (@tsugi_app) and provide any suggestions or feedback for future versions!
Ratings & Reviews
- KeitaiTango is now Tsugi! We have completely rebranded and overhauled the app to focus on next-generation Japanese immersion.
- Added AI-Powered n+1 Sentence Mining to automatically isolate the exact grammar patterns and vocabulary matching your current level.
- Implemented a blazing fast, privacy-first local tokenizer to break down complex native sentences on-device.
- Upgraded the spaced-repetition (SRS) algorithm to adapt dynamically to your personal forgetting curve.
- Redesigned the core interface and study metrics for a smoother workflow.
- Bug fixes and optimizations for a seamless transitions to the new Tsugi naming convention.
The developer, Dittman Shum, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Dittman Shum
- Size
- 76.7 MB
- Category
- Education
- Compatibility
Requires iOS 26.5 or later.
- iPhone
Requires iOS 26.5 or later. - iPad
Requires iPadOS 26.5 or later. - Mac
Requires macOS 26.5 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.5 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Premium Monthly Subscription $0.99
- Premium Annual Subscription $4.99
- Pro Lifetime $19.99
- No Ads $0.99
- Premium Lifetime $10.99
- Premium Weekly Subscription $0.49
- Tip $2.99
- Copyright
- © 2026 san serif