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SillyTavern vs Open WebUI: catalog facts
SillyTavern	Open WebUI
Free Free and open source under the AGPL. You pay only for whatever model backend you connect…	Freemium Free to self-host. The project sells an enterprise plan with support and branding rights.
Windows, macOS, Linux, Self-hosted	Self-hosted, Web
Deep prompt control: character cards, lorebooks, world info, author's notes and templates Connects to local runners as well as commercial APIs	One interface for local Ollama models and any OpenAI-compatible API Document upload and retrieval so you can ask questions about your own files
A front end only; you must supply a model backend Setup involves Node or Docker rather than an installer	The licence adds a branding condition, so it is not plain BSD It is a server you have to run, update and secure yourself
Self-hosted	Self-hosted, Web application
Open source	Not stated if open source
License: AGPL-3.0	License: Open WebUI License, based on BSD-3-Clause with a branding clause
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 21, 2026

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