Jan, The Jouster's Review 2026
Joute's review of Jan. Score, EUR pricing, obsolescence risk, alternatives.
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Jan in brief
The 100% local and open source ChatGPT alternative. Less polished than LM Studio, but fully transparent.
- Joute score7.5/10
- PriceFree, open source
- CategoryChat & modèles
- RecommendedYes
The Essentials in 20 Seconds
- Open source desktop app for running LLMs locally, a local ChatGPT alternative
- Pricing: free, open source
- Joute score: 7.5/10
- Obsolescence risk: 7/10
- Who it's for: privacy-conscious users who want a fully open source local AI chat
Verdict: Jan is the most transparent option for local AI chat. Open source end-to-end, clean interface, no hidden telemetry.
What Is Jan?
Jan is an open source desktop app (MIT license) developed by Menlo Research. It lets you run LLMs locally with an interface similar to ChatGPT. It supports macOS, Windows, and Linux and also exposes a local API server.
Its difference from LM Studio is total open source: the code is public, auditable, without unwanted telemetry.
What Works
Total Open Source
Jan is fully open source. No hidden proprietary components, no unconsented telemetry. For users who trust code they can audit, it's a guarantee LM Studio can't offer as much.
Clean User Interface
Jan offers a familiar chat interface, close to ChatGPT. Non-technical users can get started quickly.
Local API Server
Like Ollama and LM Studio, Jan exposes its models via an OpenAI-compatible API for third-party integrations.
Multi-Platform Support
macOS, Windows, Linux: all systems covered.
What Doesn't Work
Fewer Features Than LM Studio
The model library is less rich and less well curated than LM Studio. The model discovery experience is less refined.
Performance
Jan is sometimes slower than Ollama on inference for the same models. Optimization is less aggressive.
Smaller Community
Jan has fewer users and contributors than Ollama or LM Studio, which translates to less community support.
Comparison Table
| Tool | Score | Open Source | Interface | Transparency |
|---|---|---|---|---|
| Jan | 7.5/10 | 100% | GUI | Maximum |
| LM Studio | 7.8/10 | Partial | GUI | Good |
| Ollama | 8.2/10 | 100% | CLI | Maximum |
| GPT4All | 7.0/10 | 100% | GUI | Good |
Pricing
- Free, open source (MIT)
Who It's For
Yes for: users who want a local LLM with a total open source guarantee. Those who audit the code of their tools.
No for: those seeking the best user experience — LM Studio is more polished. Advanced developers — Ollama is more powerful.
Karpathy Obsolescence Risk
Score: 7/10. Open source with MIT, so longevity doesn't depend on a company. The risk is falling behind LM Studio and Ollama on features.
Final Verdict
Jan is the right choice for those who put open source and transparency first. For the best user experience, LM Studio wins. For developer power, Ollama wins.
Joute score: 7.5/10.
FAQ
Is Jan truly open source?
Yes, MIT license, code on GitHub. Fully auditable.
Jan vs LM Studio, which to choose?
Jan for total open source transparency. LM Studio for a better model library and more features.
Does Jan collect data?
Jan declares it doesn't collect data without consent. Being open source, this can be verified in the code.
Sources
- Official Jan site - verified May 2026
- Jan GitHub - verified May 2026
Jan is open source and free. Joute earns no commission. Learn more about our affiliate policy.
Screenshots Jan
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Jan : 7.5/10.
The 100% local and open source ChatGPT alternative. Less polished than LM Studio, but fully transparent..
Test Jan yourself
A free trial is available. Plan thirty minutes to form your own opinion.
Affiliate link. Joute earns a commission at no extra cost to you. Our verdict stays independent.
Jan
Free, open source