Compare software

Sumire Japanese Keyboard vs Fcitx5 for Android: catalog facts
Sumire Japanese Keyboard	Fcitx5 for Android
Free Free and open source under the MIT licence.	Free Free and open source under the LGPL-2.1 licence.
Android	Android
All conversion and learning data stays on the device Kana and romaji input with candidate conversion	Many Chinese input schemes built in RIME plugin with custom schema import
The F-Droid Lite build leaves out some features of the full app Project documentation is mostly in Japanese	Keyboard layout is not customizable yet Google Play builds use a different signature from GitHub and F-Droid builds
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: LGPL-2.1
No account needed	No 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 2, 2026

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