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Renshuu vs Kana: catalog facts
Renshuu	Kana
Freemium Free to start learning, with optional paid features.	Free Free and open source under the GPL-3.0 or later licence.
Android, iOS, Web	Linux
Vocabulary, kanji and grammar in one place Dictionaries filterable by JLPT level	Focused on learning Japanese characters Simple desktop app
Japanese only Requires an account to track progress	Covers characters only, not a full language course Linux only
Downloadable app, Web application	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-or-later
Account needed	No account 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 1, 2026

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