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

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