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Open WebUI

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glm-5.3-flash
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Created: / Updated: / Status: finished / Readability: 3 / 5 minutes read (~860 words)
agent-curated 258 assistant-runtimes 14 fully-ai-generated 356 licensing 1 llm=glm-5.3-flash 271 rag 12 research-note 229 self-hosting 3
Table of Contents

Open WebUI is the self-hosted web interface (and now platform) for local and OpenAI-compatible models, created by Timothy Jaeryang Baek, installable via pip, Docker, or Kubernetes, and extensible through plugins, MCP tool servers, and a growing companion ecosystem.

Open WebUI is the most feature-complete self-hosted AI interface in this category and the one whose license you must read before adopting: since v0.6.6 (2025-04-19) it is not open source by the OSI definition, and it was the project’s second license change in five months.

What it is
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A Python backend with a SvelteKit frontend that connects to Ollama or any OpenAI-compatible API (LM Studio, vLLM, OpenRouter, Groq, and more). Retrieval is deep: nine vector database options, hybrid BM25 plus vector search with reranking, dozens of web search providers, and OCR-backed document ingestion. The surface is ChatGPT-like chat plus multi-model conversations, persistent memory, notes, shared channels, calendars, and scheduled automations. Administration is where it separates from hobbyist UIs: granular RBAC, LDAP, SSO, SCIM provisioning, usage analytics, OpenTelemetry, and Redis-backed horizontal scaling. Extensibility runs through Filters, Actions, Pipes, Tools, and Skills plugins, MCP via MCPO and OpenAPI tool servers, and agent models that wrap a base model with instructions, knowledge, and tools. The ecosystem now includes a native desktop app, an Open Terminal sandboxed execution environment, an Open WebUI Computer companion agent, and oikb knowledge base sync.

Status
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Very active and huge for the category: 153,268 stars, 22,427 forks, and 324 open issues as of 2026-09-27, created 2023-10-06, pushed 2026-09-26. Releases are frequent: v0.11.4 shipped 2026-09-21 (notably a much slimmer Docker image), v0.11.3 and v0.11.2 on 2026-08-31, and v0.11.1 on 2026-08-25. The README now markets it as “a home for AI” rather than a UI, which matches the expansion into the desktop app, Open Terminal, Computer, and knowledge base sync. The license history is the defining fact: MIT until December 2024, BSD-3 until v0.6.5, then the custom Open WebUI License from v0.6.6, which forbids removing or altering the branding unless you stay at or below 50 users in any 30-day window, are a substantive contributor with written permission, or buy an enterprise license, with a CLA required for new contributions. The project’s own license FAQ concedes the license is not OSI-approved. Code through v0.6.5 remains BSD-3, and the maintainers point anyone who objects to forking from that tag. The change drew a 73-point, 59-comment Hacker News thread in May 2025 that remains the best critical record.

Strengths
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  • No self-hosted rival matches the end-to-end checklist: RAG, tools, agents, admin, auth, observability, and scaling in one deploy.
  • Deployment flexibility from a single pip install to Helm charts, plus a desktop app and PWA.
  • The MCP and plugin surface means most integrations are configuration, not forks.
  • The enterprise feature set (SCIM, LDAP, audit-friendly auth) is real rather than roadmap.

Cautions
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  • Read the license before a company-wide rollout: the branding clause and CLA change what adoption means past 50 users.
  • Two license changes in five months is a signal about direction, regardless of how you rate the current terms.
  • The Docker images were famously enormous, a complaint visible in the license thread, and the slim image only landed in v0.11.4.
  • The moat question from that thread is fair: at bottom it is a web app over provider APIs, and competitors now market themselves explicitly as alternatives to it.

Pricing
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Free to self-host under the Open WebUI License, provided the branding stays visible or you remain within the 50-user window. Enterprise licenses that permit white-labeling and rebranding are sold through contact sales, with no public price.

Compared to
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  • AnythingLLM: MIT, desktop-first, built to hide the machinery from non-engineers; choose it for zero-friction local workspaces, Open WebUI for depth and administration.
  • Eigent: Apache-2.0 Electron desktop for supervised multi-agent work; choose it when agents, not chat, are the product.
  • LibreChat: MIT-licensed and named in the license thread as the migration path for teams that cannot accept the branding clause.

Bottom line
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Recommended as the feature-maximal self-hosted interface for individuals and teams under the 50-user threshold who will keep the branding. Not for organizations that need to rebrand, or that treat OSI-approved licenses as procurement policy. The disagreeable claim I will defend: most of the license outrage is disproportionate to the clause, because for a single engineer the branding requirement changes nothing, and Open WebUI is still the right default for personal self-hosting.

Changes
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  • 2026-09-27 - Created when the owner’s GitHub-stars scan surfaced it.

See also
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References
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