Jan

Your private AI assistant, 100% offline, no subscription.

💰Free ★★★★½ 4.6/5 (74 opinion)

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Overview of Jan

https://jan.ai

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Présentation détaillée

Jan is an __open source alternative to ChatGPT__ that runs entirely on your machine. It lets you run __AI models locally__ (Llama 3, Gemma 3, Mistral…) without sending your data to remote servers. Jan includes an __OpenAI-compatible API__ server, MCP integration for agentic capabilities, and its own models like Jan-v2 (multimodal). Available on Windows, Mac and Linux, Jan is the ideal solution for those who prioritize __data privacy and sovereignty__.

What is Jan?

Jan is an open source desktop application that lets you run language models directly on your machine. It relies on open source models like Llama 3, Gemma 3, Mistral, and others in GGUF format. Jan also includes its own models like Jan-v2 (multimodal with vision) and Jan-v1 (with web search). The application is available free on GitHub.

Main Features

Jan offers a set of features designed for privacy and flexibility. The chat interface is intuitive and resembles ChatGPT’s. A VS Code-style extension system allows you to add features. The local OpenAI-compatible API server lets you integrate Jan with other tools. Support for NVIDIA GPUs and Apple M-series processors accelerates local model inference. MCP integration adds advanced agentic capabilities.

Use Cases

Jan is ideal for professionals handling sensitive data: lawyers, doctors, consultants, researchers. It’s also great for developers wanting a local AI server for their projects, enterprises with strict compliance constraints, and enthusiasts wanting to experiment with open source models without relying on a subscription.

Advantages

Jan’s main advantage is absolute privacy guarantee: no data leaves your machine. The absence of subscription eliminates recurring costs. OpenAI API compatibility simplifies integration into existing ecosystems. GPU support optimizes performance for users with the right hardware.

Pricing

Jan is completely free and open source. No paid plan is required to access core features. An optional 100% offline voice dictation feature is available for $24 as a one-time payment on Mac. Open source models are downloadable for free.

Conclusion

Jan is the reference solution for users who want the power of generative AI without compromising on privacy. Its open source and 100% local approach makes it a unique and valuable tool in the AI assistant ecosystem.

✅ Strengths

100% local operation: no data leaves your machine
Support for many open source models: Llama 3, Gemma 3, Mistral
OpenAI-compatible API server for integration with other tools
Intuitive interface available on Windows, Mac and Linux
MCP integration for advanced agentic capabilities
Entirely free and open source, no subscription

⚠️ Limits

Requires a powerful computer (min. 8 GB of RAM)
Local models perform less well than premium cloud LLMs
Initial setup more complex for non-technical users
Models take up multiple gigabytes of hard drive space

👤 GOOD CHOICE?

Jan est-il fait pour vous ?

✓ Ideal if you…

✓ Professionnels soucieux de la confidentialité
✓ Développeurs souhaitant un serveur IA open source local
✓ Entreprises soumises à des contraintes de conformité
✓ Passionnés qui testent des modèles open source en local

✗ To avoid if you…

✗ Utilisateurs avec un ordinateur peu puissant (< 8 Go RAM)
✗ Débutants cherchant une solution prête à l’emploi
✗ Besoins de modèles propriétaires premium (GPT-4o…)
✗ Equipes ayant besoin d’accès cloud partagé

🎯 Our verdict

Jan is a remarkable solution for anyone who refuses to entrust their data to cloud services. Its 100% offline and open source philosophy makes it a unique tool in the AI assistant landscape. Compatibility with flagship models like Llama 3, Gemma 3 or Mistral guarantees solid performance for most daily use cases. The OpenAI-compatible API server opens many possibilities for integration with third-party tools. However, non-technical users may be confused by the initial setup and hardware requirements. Jan is particularly relevant for professionals, researchers and enterprises that must respect strict data privacy constraints. It’s today one of the best local alternatives to ChatGPT, and its continuous evolution makes it an open source project to follow closely.

❓ FREQUENT QUESTIONS

FAQ — Jan

Does Jan require an internet connection?

No, Jan runs entirely locally on your computer. An internet connection is only needed to download the AI models initially. After that, everything works offline.

Which AI models can I use with Jan?

Jan supports open source models in GGUF format: Llama 3, Gemma 3, Mistral, Phi, and many others. You can also connect cloud APIs like OpenAI or Anthropic if you wish.

What are the hardware requirements to use Jan?

Jan requires a minimum of 8 GB of RAM and a processor with AVX2 support. An NVIDIA GPU or Apple M-series processor significantly improves performance of local models.

Is Jan truly free?

Yes, Jan is completely free and open source. No subscription is required. The only exception is an optional offline voice dictation feature at $24 as a one-time payment on Mac.

Is Jan compatible with tools that use the OpenAI API?

Yes, Jan includes a local API server compatible with OpenAI format. This means you can connect it to many tools that support the OpenAI API while keeping your data local.

★★★★½ 4.6/5 (74 avis)

✅ Verified by Comparateur-IA

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