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macSKK vs ATOK: catalog facts
macSKK	ATOK
Best for: SKK users who type Japanese on a Mac	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
SKK-style Japanese input on modern macOS Universal Binary for Apple Silicon and Intel All 3 strengths for macSKK SKK-style Japanese input on modern macOS Universal Binary for Apple Silicon and Intel Actively developed with a long commit history	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
Requires macOS 13.3 or later Tested only on Apple Silicon All 3 limitations for macSKK Requires macOS 13.3 or later Tested only on Apple Silicon Documentation mostly in Japanese	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 macSKK github.com/mtgto/macSKK 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.