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Google Japanese Input vs AquaSKK: catalog facts
Google Japanese Input	AquaSKK
Best for: Anyone typing Japanese on a Windows or Mac computer	Best for: Japanese typists on macOS who want explicit control over kana-kanji conversion
Free Free to download and use.	Free Free and open source.
Windows, macOS	macOS
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	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
No Linux build; Mozc fills that role Site and help are in Japanese	SKK input style takes time to learn macOS only
Downloadable app	Downloadable app
Not open source	Open source
License not stated	License not stated
No account needed	No account needed
Not stated if it works offline	Offline features available
Official website Full listing and sources Sources for Google Japanese Input google.co.jp/ime Catalog checked October 1, 2026	Official website Full listing and sources Sources for AquaSKK github.com/codefirst/aquaskk Catalog checked October 1, 2026

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