The apps in detail
The most established Android WaniKani app and a fork of the original Flaming Durtles. It has the deepest feature set, including themes, script-like customisation, and an undo button.
Strengths
- Most mature app with the largest user base
- Extensive customisation and theme support
- Undo button for correcting typos
- Active community and regular updates
Trade-offs
- Can feel heavy with so many options
- Closed source
- Play Store only, no F-Droid or direct APK
- No Wear OS support
Power users who want every feature and don't mind some complexity.
A minimalist, open-source WaniKani client built with React Native. Designed around a distraction-free review flow, offline-first storage, and a few thoughtful extras like typo tolerance and a Wear OS companion.
Strengths
- Open source (GitHub)
- Offline-first with SQLite, syncs queued progress later
- Wear OS companion for review counts on your wrist
- Typo tolerance catches near-miss answers instead of marking them wrong
- Zen mode strips the review screen down to just the question and input
- Smart notifications warn when your review pile hits 20+
- Direct APK download, no store required
Trade-offs
- Newer project with a smaller community
- No Play Store listing yet
- Fewer customisation options than Smouldering Durtles
Learners who want something simple, open, and focused on review flow without distractions.
A modern, native Android app with a polished design language. Built as a clean alternative to the WaniKani mobile web experience with a focus on visual clarity.
Strengths
- Polished, modern UI
- Native Android performance
- Good search functionality
- Active development on Play Store
Trade-offs
- Closed source
- No Wear OS or offline-first design
- Smaller feature set than Smouldering Durtles
Users who prioritise a clean, modern interface and want a Play Store install.
A cross-platform WaniKani app available on both Android and iOS. Still in beta, with a retro-inspired design and a focus on bridging the WaniKani web experience to mobile.
Strengths
- Cross-platform (Android and iOS)
- Distinctive retro-inspired design
- Active development with regular beta updates
Trade-offs
- Still in beta, some rough edges
- Closed source
- Smaller feature set than established apps
- No Wear OS support
Early adopters who want a consistent experience across Android and iOS.
A newer WaniKani companion available on both Google Play and the App Store. It focuses on a polished, modern interface with light and dark modes, detailed progress statistics, subject search, and offline support.
Strengths
- Available on both Google Play and the App Store
- 10K+ downloads on Google Play
- Polished, modern interface with light and dark modes
- Detailed progress statistics and subject search
- Can accept any valid kanji reading
- Offline support
Trade-offs
- Closed source, no public source code
- In-app purchases
- Android install is Play Store only, no direct APK
- Newer project with a smaller community
Users who want a polished, multi-platform WaniKani companion with a storefront install.
If you want something simple and open
Krabikani is the only option on this list that is fully open source. You can read the code, build it yourself, or grab the APK directly from krabikani.app. It does not need Google Play Services, and it comes with a Wear OS companion that none of the other apps offer.
The review experience is the focus: typo tolerance means you are not punished for fat-fingering a reading on a small keyboard, and Zen mode strips everything away so you can just work through your queue. When you are offline, everything is stored in SQLite and synced when you reconnect.