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Kakugo vs Nihonoari: catalog facts
Kakugo	Nihonoari
Free Free and open source under GPL-3.0.	Free Free and open source under the GPL-3.0 licence, with no ads or in-app purchases.
Android	Android
Covers hiragana, katakana and kanji Adapts review to the learner's pace	Focused only on Hiragana and Katakana practice No adverts or in-app purchases
Focused on memorisation, not grammar or speaking Android only	Covers kana only, not kanji or vocabulary No GitHub releases; installed through F-Droid
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.