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Open Hitomi vs Kai 9000: catalog facts
Open Hitomi	Kai 9000
Free Free and open source; AI chat uses your own API key.	Free Free and open source under Apache-2.0; cloud providers may charge for their own API keys.
Android	Windows, macOS, Linux, Android, iOS, Web
Floating overlay usable on top of other apps Bring-your-own-key chat	Works with many AI providers and falls back between them automatically Offline Gemma 4 models on Android and desktop
Early-stage project with a small user base Chat requires an API key from a model provider	Cloud providers need your own API keys Background autonomy and shell access need careful configuration
Downloadable app	Downloadable app, Web application
Open source	Open source
License: AGPL-3.0-or-later	License: Apache-2.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.