Smouldering Durtles
Smouldering Durtles is a free, open-source education app for Android. A client for WaniKani, with advanced features built in and offline reviews. It has 117 GitHub stars and is released under the Apache-2.0 license, and you can install it from F-Droid and Google Play.
github.com/jerryhcooke/smouldering_durtles (opens in a new tab)
About Smouldering Durtles
Introducing Smouldering Durtles, your trusty companion app for the renowned WaniKani kanji learning platform, crafted by Tofugu! If you're on a quest to master Kanji with WaniKani, Smouldering Durtles is here to make your lessons and reviews engaging and enjoyable, with a plethora of features to enhance your learning experience. Smouldering Durtles offers advanced searching capabilities, allowing you to quickly locate the exact Kanji or vocabulary you're looking for. Bolster your learning with self-study quizzes, testing your knowledge and helping you retain what you've learned.
Privacy and F-Droid
F-Droid builds Smouldering Durtles from its published source code and flags anti-features such as ads, tracking or reliance on non-free services.
No anti-features flagged on the latest F-Droid build.
Screenshots
Screenshots from the app's F-Droid listing.
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What is Smouldering Durtles?
Smouldering Durtles is a free, open-source education app for Android. A client for WaniKani, with advanced features built in and offline reviews. It has 117 GitHub stars and is released under the Apache-2.0 license, and you can install it from F-Droid and Google Play.
Is Smouldering Durtles free and open source?
Yes. Smouldering Durtles's source code is public on GitHub under the Apache-2.0 license, which is OSI-approved or FSF-free. F-Droid, which builds it from source, flags no anti-features such as ads or tracking on its latest build.
How do I install Smouldering Durtles?
You can install Smouldering Durtles from F-Droid (package com.smouldering_durtles.wk) and from Google Play; the links are on this page. Its GitHub repository also publishes releases (latest: v1.2.8).
Is Smouldering Durtles still maintained?
The repository's most recent commit was on Jul 16, 2026. Its F-Droid listing was last updated on Jul 19, 2026. appsgit only lists apps whose repository had a commit in the last six months.