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macSKK vs AquaSKK: catalog facts
macSKK	AquaSKK
Best for: SKK users who type Japanese on a Mac	Best for: Japanese typists on macOS who want explicit control over kana-kanji conversion
Free Free and open source.	Free Free and open source.
macOS	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	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
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	SKK input style takes time to learn macOS only
Downloadable app	Downloadable app
Open source	Open source
License not stated	License not stated
No account needed	No account needed
Offline features available	Offline features available
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 AquaSKK github.com/codefirst/aquaskk Catalog checked October 1, 2026

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