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JapaChar vs Nihonoari: catalog facts
JapaChar	Nihonoari
Free Free and open source under AGPL-3.0-only.	Free Free and open source under the GPL-3.0 licence, with no ads or in-app purchases.
Linux	Android
Gradually introduces Japanese characters Tracks familiarity to prioritize character review	Focused only on Hiragana and Katakana practice No adverts or in-app purchases
The developer says the app is most useful to learners who know a language based on Latin script	Covers kana only, not kanji or vocabulary No GitHub releases; installed through F-Droid
Downloadable app	Downloadable app
Open source	Open source
License: AGPL-3.0-only	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 8, 2026	Official website Full listing and sources Checked October 2, 2026

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