Flaming durtles doesn’t seem to be actively updated anymore. However, there is now Smouldering durtles which is Flaming durtles except it is being updated and kana-only words show as vocabulary there (as I’ve heard it; I don’t actually use it myself). See this thread: [Android] Smouldering Durtles (v1.0.9) - native app with offline lessons and reviews, plus themes and script-like features!
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