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Renshuu vs Kakugo: catalog facts
Renshuu	Kakugo
Freemium Free to start learning, with optional paid features.	Free Free and open source under GPL-3.0.
Android, iOS, Web	Android
Vocabulary, kanji and grammar in one place Dictionaries filterable by JLPT level	Covers hiragana, katakana and kanji Adapts review to the learner's pace
Japanese only Requires an account to track progress	Focused on memorisation, not grammar or speaking Android only
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.