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macSKK vs Google Japanese Input: catalog facts
macSKK	Google Japanese Input
Best for: SKK users who type Japanese on a Mac	Best for: Anyone typing Japanese on a Windows or Mac computer
Free Free and open source.	Free Free to download and use.
macOS	Windows, macOS
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	Large vocabulary built from web usage Automatic dictionary updates All 4 strengths for Google Japanese Input Large vocabulary built from web usage Automatic dictionary updates Phrase autocomplete with a secret mode Typed text is not sent to Google
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	No Linux build; Mozc fills that role Site and help are in Japanese
Downloadable app	Downloadable app
Open source	Not open source
License not stated	License not stated
No account needed	No 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 Google Japanese Input google.co.jp/ime Catalog checked October 1, 2026

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