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AquaSKK vs Google Japanese Input: catalog facts
AquaSKK	Google Japanese Input
Best for: Japanese typists on macOS who want explicit control over kana-kanji conversion	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
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	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
SKK input style takes time to learn macOS only	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 AquaSKK github.com/codefirst/aquaskk 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.