Open WebUI vs 
Kotaemon
Open WebUI vs Kotaemon compared for 2026 — features, license, ease of use, performance and which one to choose. ChatGPT-style interface over any model vs Clean open UI to chat with documents.
Updated regularly · curated by OpenSourceAI.tech
Open WebUI vs Kotaemon at a glance
| Spec | Open WebUI | Kotaemon |
|---|---|---|
| Category | Self-hosted chat UI | Self-hosted chat UI |
| Type | Self-hosted web UI | RAG chat UI |
| License | BSD-3-Clause | Apache-2.0 |
| Runs locally | Self-hosted | Self-hosted |
| Primary language | Svelte | Python |
| Ease of use | Intermediate | Beginner |
| Best for | teams that want a shared web UI over local models | teams wanting a ready-made document QA UI |
| GitHub stars | 147.2k | 25.7k |
How Open WebUI and Kotaemon score
| Criterion | Open WebUI | Kotaemon |
|---|---|---|
| Popularity | 5.0 | 3.5 |
| Maintenance | 5.0 | 5.0 |
| Ease of use | 3.5 | 5.0 |
| Privacy | 4.5 | 4.5 |
| License freedom | 5.0 | 5.0 |
Scores are computed automatically from public signals — GitHub stars (popularity), recent commit activity (maintenance), license type (freedom), local-first design (privacy) and onboarding complexity (ease of use). Indicative, not a verdict.
What each one is
Open WebUI
Open WebUI is a self-hosted, ChatGPT-style web interface that runs on top of Ollama or any OpenAI-compatible API, with chat history, model switching and document RAG.
- Polished ChatGPT-style UI with multi-user support
- Built-in document RAG and model switching
- Works with Ollama or any OpenAI-compatible endpoint
Kotaemon
Kotaemon is a clean, open-source RAG interface for chatting with your documents, with citations, multi-user support and a customizable pipeline for developers.
- Answers with inline citations and previews
- Both end-user UI and developer framework
- Gradio-based, easy to theme and extend
Key differences
Open WebUI is self-hosted web UI, while Kotaemon is rAG chat UI. Their licenses differ (BSD-3-Clause vs Apache-2.0), which matters if you ship a commercial product. Open WebUI leans more intermediate-friendly, whereas Kotaemon is more suited to beginner users. In short, Open WebUI fits teams that want a shared web UI over local models, and Kotaemon fits teams wanting a ready-made document QA UI.
Which should you choose?
Choose Open WebUI for teams that want a shared web UI over local models. Choose Kotaemon for teams wanting a ready-made document QA UI.
There is rarely one winner — many setups use both. The right pick depends on your hardware, your team's skills, and whether you value simplicity or control.
Frequently asked questions
Is Open WebUI or Kotaemon easier to use?
Kotaemon is generally the easier of the two to get started with, while Open WebUI rewards more setup with more control.
Are Open WebUI and Kotaemon free?
Open WebUI is free and open source (BSD-3-Clause), and Kotaemon is free and open source (Apache-2.0). Neither charges for the core software.
Can I run Open WebUI and Kotaemon locally?
Open WebUI: self-hosted · Kotaemon: self-hosted. Both can be used without sending your data to a third-party cloud where their setup allows.
Open WebUI vs Kotaemon — which should I pick in 2026?
Choose Open WebUI for teams that want a shared web UI over local models. Choose Kotaemon for teams wanting a ready-made document QA UI.
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