head to head · open source
Jan vs CosyVoice
Jan has 44,512 GitHub stars, 3,032 forks, 521 open issues and last shipped yesterday. CosyVoice has 23,661 stars, 2,690 forks, 698 open issues and last shipped 4 months ago. Jan leads on adoption by 88% (44,512 vs 23,661 stars). Jan is written in TypeScript under a custom or non-standard licence; CosyVoice is written in Python under Apache-2.0. Jan has attracted 7% as many forks as stars, CosyVoice 11%. Jan was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (chatgpt), 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
| Jan | CosyVoice | |
|---|---|---|
| GitHub stars | ★ 45K | ★ 24K |
| License | Custom / other | Apache-2.0 |
| Written in | TypeScript | Python |
| Last push | 2026-09-17 | 2026-05-25 |
| Forks | ⑂ 3.0K | ⑂ 2.7K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Jan if
- You weight community size — 45K stars and counting
- You want the Custom / other license terms
- Your stack matches TypeScript
- 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 Jan
Jan is an open source desktop application that serves as a ChatGPT replacement, enabling users to run large language models (LLMs) locally on their machines or connect to cloud based providers like OpenAI and Anthropic. It is built with Tauri, TypeScript, and integrates llama.cpp for efficient local inference, targeting privacy conscious users who want full control over their AI workflows without sending data to third parties.
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 Jan or CosyVoice more popular?
Jan has 44,512 GitHub stars and CosyVoice has 23,661. Jan has the larger community by that measure.
Are Jan and CosyVoice free?
Both are open source. Jan 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 Jan and CosyVoice?
Jan is written in TypeScript 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, Jan or CosyVoice?
Choose Jan if you want the larger community (44,512 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.