head to head · open source
Open WebUI vs CosyVoice
Open WebUI has 152,394 GitHub stars, 22,296 forks, 294 open issues and last shipped yesterday. CosyVoice has 23,661 stars, 2,690 forks, 698 open issues and last shipped 4 months ago. Open WebUI leads on adoption by 544% (152,394 vs 23,661 stars). Open WebUI is written in Python under a custom or non-standard licence; CosyVoice is written in Python under Apache-2.0. Open WebUI has attracted 15% as many forks as stars, CosyVoice 11%. Open WebUI was the more recently maintained of the two, and both are self-hostable with no licence fee.
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 | CosyVoice | |
|---|---|---|
| GitHub stars | ★ 152K | ★ 24K |
| License | Custom / other | Apache-2.0 |
| Written in | Python | Python |
| Last push | 2026-09-17 | 2026-05-25 |
| Forks | ⑂ 22K | ⑂ 2.7K |
| 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 CosyVoice if
- You want the CosyVoice feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Python
- You evaluated both and CosyVoice 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 CosyVoice
CosyVoice is an Apache 2.0 Python text to speech system built on large language models that ships inference, training and deployment for multi lingual voice generation, aimed at teams who need self hosted zero shot voice cloning and streaming speech synthesis rather than a hosted API.
read the full CosyVoice overview →
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Frequently asked questions
Is Open WebUI or CosyVoice more popular?
Open WebUI has 152,394 GitHub stars and CosyVoice has 23,661. Open WebUI has the larger community by that measure.
Are Open WebUI and CosyVoice free?
Both are open source. Open WebUI has no licence declared in this registry, and CosyVoice is licensed under Apache-2.0. Both are free to self-host.
What is the difference between Open WebUI and CosyVoice?
Open WebUI is written in Python and CosyVoice in Python. 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 CosyVoice?
Choose Open WebUI if you want the larger community (152,394 stars) or its Custom / other licence terms. Choose CosyVoice if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.