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Sime vs Squirrel: catalog facts
Sime	Squirrel
Free Free and open source under the Apache-2.0 license.	Free Free and open source, with optional donations to the developer.
macOS, Linux, Android	macOS
Supports full Pinyin and T9 layouts Phrase learning and candidate ranking run locally	Many Chinese input schemes, from Pinyin to Cangjie and Jyutping Custom input schemes can be written and shared
F-Droid build omits the optional handwriting recognizer Linux frontend is documented for Arch Linux	Configuration is done through text files and takes some learning Documentation is mainly in Chinese
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License not stated
Not stated if an account is needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 1, 2026

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