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Stable Assistant vs Stable Diffusion web UI: catalog facts
Stable Assistant	Stable Diffusion web UI
Paid Subscription service from Stability AI; check the site for current plans.	Free The open-source software is available without a license fee. Hosting, hardware and…
Web	Windows, macOS, Linux
Chat interface for generation and editing Inpainting, erase and search-and-replace tools	Includes inpainting, outpainting and configurable generation settings.
Requires an account and internet connection Limited to Stability AI's own models	Requires Python, model files and suitable processing hardware.
Web application	Downloadable app
Closed source	Open source
License not stated	License: AGPL-3.0
Account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 26, 2026	Official website Full listing and sources Checked September 22, 2026

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