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ATOK vs AquaSKK: catalog facts
ATOK	AquaSKK
Paid Sold as the ATOK Passport subscription with a free trial.	Free Free and open source.
Windows, macOS, Android, iOS	macOS
Conversion engine that adapts to your typing habits 63 optional genre dictionaries	Predictable conversion without morphological analysis Open source with build instructions
Subscription required after the trial Website and interface are in Japanese	SKK input style takes time to learn macOS only
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
Account needed	No account needed
Not stated if it works offline	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.