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AquaSKK vs ATOK: catalog facts
AquaSKK	ATOK
Best for: Japanese typists on macOS who want explicit control over kana-kanji conversion	Best for: People who type a lot of Japanese and want more accurate conversion
Free Free and open source.	Paid Sold as the ATOK Passport subscription with a free trial.
macOS	Windows, macOS, Android, iOS
Predictable conversion without morphological analysis Open source with build instructions All 3 strengths for AquaSKK Predictable conversion without morphological analysis Open source with build instructions Works offline	Conversion engine that adapts to your typing habits 63 optional genre dictionaries All 4 strengths for ATOK Conversion engine that adapts to your typing habits 63 optional genre dictionaries One subscription covers desktop and mobile Built-in AI rewrite assistant
SKK input style takes time to learn macOS only	Subscription required after the trial Website and interface are in Japanese
Downloadable app	Downloadable app
Open source	Not open source
License not stated	License not stated
No account needed	Account needed
Offline features available	Not stated if it works offline
Official website Full listing and sources Sources for AquaSKK github.com/codefirst/aquaskk Catalog checked October 1, 2026	Official website Full listing and sources Sources for ATOK atok.com/mac play.google.com/store/apps/details apps.apple.com/jp/app/atok-professional-%E6%97%A5%E6%9C%AC%… Catalog checked October 1, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.