head to head · open source
Jan vs Gemini-API
Jan has 45,409 GitHub stars, 3,145 forks, 521 open issues and last shipped yesterday. Gemini-API has 3,785 stars, 593 forks, 37 open issues and last shipped 28 days ago. Jan leads on adoption by 1,100% (45,409 vs 3,785 stars). Jan is written in Rust under a custom or non-standard licence; Gemini-API is written in Python under AGPL-3.0. Jan has attracted 7% as many forks as stars, Gemini-API 16%. Jan was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (llm), 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 | Gemini-API | |
|---|---|---|
| GitHub stars | ★ 45K | ★ 3.8K |
| License | Custom / other | AGPL-3.0 |
| Written in | Rust | Python |
| Last push | 2026-11-04 | 2026-10-08 |
| Forks | ⑂ 3.1K | ⑂ 593 |
| 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 Rust
- You value the larger contributor base for long-term maintenance
pick Gemini-API if
- You want the Gemini-API feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches Python
- You evaluated both and Gemini-API fits your workflow better
About Jan
Jan Open source ChatGPT replacement English · 中文 · 日本語 Getting Started Community Changelog Bug reports Jan is bringing the best of open source AI in an easy to use product. Download and run LLMs with full control and privacy . Installation The easiest way to get started is by downloading one of the following versions for your respective operating system: Platform Download Windows jan.exe macOS jan.dmg Linux (deb) jan.deb Linux (AppImage) jan.AppImage Linux (Arm64) How to Download from jan.ai or GitHub Releases. Features Local AI Models : Download and run LLMs (Llama, Gemma, Qwen, GPT oss etc.) from HuggingFace…
About Gemini-API
Gemini API A reverse engineered asynchronous Python wrapper for the Google Gemini web app (formerly Bard). Features Persistent Cookies Automatically refreshes cookies in background. Optimized for always on services. Image Generation Natively supports generating and editing images with natural language. Video & Audio Generation Supports generating videos and audio/music content natively. Deep Research Full deep research workflow with plan creation, status polling, and result retrieval. System Prompt Supports customizing the model's system prompt with Gemini Gems. Extension Support Supports generating content with…
read the full Gemini-API overview →
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Frequently asked questions
Is Jan or Gemini-API more popular?
Jan has 45,409 GitHub stars and Gemini-API has 3,785. Jan has the larger community by that measure.
Are Jan and Gemini-API free?
Both are open source. Jan has no licence declared in this registry, and Gemini-API is licensed under AGPL-3.0. Both are free to self-host.
What is the difference between Jan and Gemini-API?
Jan is written in Rust and Gemini-API 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 Gemini-API?
Choose Jan if you want the larger community (45,409 stars) or its Custom / other licence terms. Choose Gemini-API if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.