Short answerLibreChat is MIT-licensed and offers OpenAPI-based Actions and MCP. Open WebUI is very active with native MCP and a custom-model workspace, but its license adds a branding clause that matters if you white-label it.
| Open WebUI | LibreChat | |
|---|---|---|
| License | BSD-3-style plus branding-preservation clause (not OSI-approved) | MIT |
| Custom assistant | Custom model / preset | Agents |
| Knowledge | Focused Retrieval or Full Context | File Search (RAG), File Context, Code Interpreter |
| Tools | Native MCP (Streamable HTTP), OpenAPI tool servers, Python tools | MCP and OpenAPI Actions |
| Sharing | Private, users or groups, or public | Users, groups or roles |
| Hosted version | Not verified | None official found |
Details: Open WebUI, LibreChat. Both need someone to run a server: see open-source vs SaaS.
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