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Sumire Japanese Keyboard vs ATOK: catalog facts
Sumire Japanese Keyboard	ATOK
Free Free and open source under the MIT licence.	Paid Sold as the ATOK Passport subscription with a free trial.
Android	Windows, macOS, Android, iOS
All conversion and learning data stays on the device Kana and romaji input with candidate conversion	Conversion engine that adapts to your typing habits 63 optional genre dictionaries
The F-Droid Lite build leaves out some features of the full app Project documentation is mostly in Japanese	Subscription required after the trial Website and interface are in Japanese
Downloadable app	Downloadable app
Open source	Closed source
License: MIT	License not stated
No account needed	Account needed
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 October 1, 2026

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