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Renshuu vs Nihonoari: catalog facts
Renshuu	Nihonoari
Freemium Free to start learning, with optional paid features.	Free Free and open source under the GPL-3.0 licence, with no ads or in-app purchases.
Android, iOS, Web	Android
Vocabulary, kanji and grammar in one place Dictionaries filterable by JLPT level	Focused only on Hiragana and Katakana practice No adverts or in-app purchases
Japanese only Requires an account to track progress	Covers kana only, not kanji or vocabulary No GitHub releases; installed through F-Droid
Downloadable app, Web application	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
Account 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 September 24, 2026	Official website Full listing and sources Checked October 2, 2026

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