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Smouldering Durtles vs WaniKani: catalog facts
Smouldering Durtles	WaniKani
Free Free and open source under the Apache 2.0 licence; WaniKani itself is a separate service.	Freemium The first levels are free; full access requires a subscription.
Android	Web
Native Android interface for WaniKani lessons and reviews Continues a well-known open-source client that was no longer maintained	Structured path through 2,000 kanji and 6,000 words Mnemonics for radicals, kanji and vocabulary
Only useful with a WaniKani account Android only	Fixed lesson order that cannot be rearranged Covers kanji and vocabulary only, not grammar
Downloadable app	Web application
Open source	Closed source
License: Apache-2.0	License not stated
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 October 2, 2026	Official website Full listing and sources Checked September 24, 2026

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