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Fcitx 5 vs ATOK: catalog facts
Fcitx 5	ATOK
Free Free and open source under the LGPL 2.1 or later.	Paid Sold as the ATOK Passport subscription with a free trial.
Linux	Windows, macOS, Android, iOS
Supports many languages through numerous input engines Slim core extended with addons	Conversion engine that adapts to your typing habits 63 optional genre dictionaries
Linux and Unix only Setup involves installing separate engines and configuring the environment	Subscription required after the trial Website and interface are in Japanese
Downloadable app	Downloadable app
Open source	Closed source
License: LGPL-2.1-or-later	License not stated
No account needed	Account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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