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Renshuu vs Kiten: catalog facts
Renshuu	Kiten
Freemium Free to start learning, with optional paid features.	Free Free and open source under the GPL-2.0-or-later licence.
Android, iOS, Web	Windows, Linux
Vocabulary, kanji and grammar in one place Dictionaries filterable by JLPT level	English-Japanese and Japanese-English dictionaries Kanji dictionary with several lookup methods
Japanese only Requires an account to track progress	Built around KDE, so it looks most at home on a Plasma desktop Focused on lookup rather than structured lessons
Downloadable app, Web application	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0-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.