Review of Jan
Jan is an open-source alternative to ChatGPT that runs entirely on your machine. It lets you run local AI models (Llama 3, Gemma 3, Mistral…) without sending your data to remote servers. Jan includes an OpenAI-compatible local 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.
Jan: Votre assistant IA privé, 100% offline, sans abonnement.
Best for
- Professionals concerned about data privacy
- Developers wanting an open-source local AI server
- Companies with strict data compliance requirements
- Enthusiasts testing open-source models locally
Not ideal for
- Users with low-end hardware (< 8 GB RAM)
- Beginners looking for a plug-and-play solution
- Use cases needing premium proprietary LLMs (GPT-4o…)
- Teams needing shared cloud-based access
Pros & cons
- ✅ 100% local operation: no data ever leaves your machine
- ✅ Supports popular open-source models: Llama 3, Gemma 3, Mistral
- ✅ OpenAI-compatible local API server for third-party integrations
- ✅ Intuitive interface available on Windows, Mac, and Linux
- ✅ MCP integration for advanced agentic capabilities
- ✅ Completely free and open source, no subscription required
- ⚠️ Requires a powerful computer (min. 8 GB RAM)
- ⚠️ Local models are less powerful than premium cloud LLMs
- ⚠️ Initial setup is more complex for non-technical users
- ⚠️ Models take up several gigabytes of disk space
Our verdict
Jan is a remarkable solution for those who refuse 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 ensures solid performance for most daily use cases. The OpenAI-compatible API server opens many integration possibilities with third-party tools. However, non-technical users may find the initial setup and hardware requirements challenging. Jan is particularly relevant for professionals, researchers, and businesses with strict data privacy requirements. It is currently one of the best local alternatives to ChatGPT, and its constant evolution makes it an open-source project worth following closely.
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FAQ
Does Jan require an internet connection?
No, Jan runs entirely locally on your computer. An internet connection is only needed to download AI models initially. After that, everything works offline.
What 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 desired.
What are the hardware requirements for Jan?
Jan requires at least 8 GB of RAM and a CPU with AVX2 support. An NVIDIA GPU or Apple M-series processor significantly improves local model performance.
Is Jan really 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 the OpenAI format. This means you can connect it to many tools that support the OpenAI API, while keeping your data local.