head to head · open source
Open WebUI vs CopilotKit
Open WebUI has 152,394 GitHub stars, 22,296 forks, 294 open issues and last shipped yesterday. CopilotKit has 37,396 stars, 4,638 forks, 295 open issues and last shipped yesterday. Open WebUI leads on adoption by 308% (152,394 vs 37,396 stars). Open WebUI is written in Python under a custom or non-standard licence; CopilotKit is written in TypeScript under MIT. Open WebUI has attracted 15% as many forks as stars, CopilotKit 12%. CopilotKit was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (ai), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| Open WebUI | CopilotKit | |
|---|---|---|
| GitHub stars | ★ 152K | ★ 37K |
| License | Custom / other | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 22K | ⑂ 4.6K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Open WebUI if
- You weight community size — 152K stars and counting
- You want the Custom / other license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick CopilotKit if
- You want the CopilotKit feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and CopilotKit fits your workflow better
About Open WebUI
Open WebUI is a self hosted, open source AI interface that unifies access to local and cloud based large language models. It runs entirely in a web browser and supports Ollama for local model hosting alongside any OpenAI compatible API, including services like LMStudio, GroqCloud, Mistral, and OpenRouter. Built in Python, it functions as a drop in replacement for proprietary AI platforms, giving users full control over their model infrastructure and data.
read the full Open WebUI overview →
About CopilotKit
CopilotKit is a frontend SDK for building agent native applications and generative UI experiences. It provides tooling and protocols to connect AI agents—regardless of backend framework—to user interfaces across web, mobile, and messaging platforms. It lives in the agentic AI ecosystem, specifically targeting developers who need to embed intelligent assistants into products without rebuilding agent logic for each surface.
read the full CopilotKit overview →
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Frequently asked questions
Is Open WebUI or CopilotKit more popular?
Open WebUI has 152,394 GitHub stars and CopilotKit has 37,396. Open WebUI has the larger community by that measure.
Are Open WebUI and CopilotKit free?
Both are open source. Open WebUI has no licence declared in this registry, and CopilotKit is licensed under MIT. Both are free to self-host.
What is the difference between Open WebUI and CopilotKit?
Open WebUI is written in Python and CopilotKit in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Open WebUI or CopilotKit?
Choose Open WebUI if you want the larger community (152,394 stars) or its Custom / other licence terms. Choose CopilotKit if its feature set, stack or MIT licence fits better. Both are self-hostable.