Jan

Jan

Jan is a free, open-source AI assistant app that runs locally offline, serving as an offline alternative to ChatGPT. It lets you securely deploy and use various large language models on your personal computer.
Rating:
5
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open-source AI assistantlocal offline AIChatGPT alternativeJan AI usage guidelocal deployment of large language models

Features of Jan

Supports fully offline on-device operation to protect user privacy and security
Integrates multiple open-source models and is compatible with mainstream cloud APIs, offering flexible model choices
Provides a cross-platform desktop app available for macOS, Windows and Linux
Built-in model hub with support for manual imports, simplifying deployment and management of local models
Offers a local OpenAI-compatible API server to facilitate integration and further development

Use Cases of Jan

When developers or researchers need to test and run open-source LLMs in a secure local environment
Users who value data privacy want to use the AI assistant offline for conversations or content creation
Enterprises or teams needing to deploy controllable AI services on an internal network to prevent data leakage
AI enthusiasts looking for a low-cost way to experience different parameters and types of open-source models for comparative studies
Developers who need to integrate AI capabilities into their own applications via local API server calls

FAQ about Jan

QWhat is Jan? How is it different from ChatGPT?

Jan is a free, open-source local AI assistant software that can serve as an offline replacement for ChatGPT. The core difference is that Jan runs entirely on the user's local device without internet access, ensuring data privacy; ChatGPT, by contrast, is a cloud-based service. Jan primarily supports text dialogue and its features are comparatively focused.

QWhich models does Jan AI support?

Jan supports multiple open-source models (such as LLaMA, Mistral, Gemma, in GGUF format) and can connect to cloud services like OpenAI, Anthropic, Google via API. It also includes its own in-house Jan-V1-4B model, which excels at reasoning and tool invocation.

QWhat computer hardware do I need to use Jan?

Jan supports CPU and GPU acceleration (including NVIDIA and Apple M-series chips). Actual performance depends on the model size; smaller models (e.g., 4B parameters) can run on a normal PC, while larger models require more RAM and VRAM.

QIs Jan free? How do I install it?

Jan is completely free and open source. You can download desktop applications for macOS, Windows, or Linux from its official website or GitHub and install them; no registration or paid subscription is required.

QHow does Jan ensure my data is secure?

The core advantage is on-device offline operation. All conversations and data processing occur on your device and are not uploaded to any remote servers, fundamentally protecting data privacy and user control.

QDoes Jan support Chinese?

The Jan interface currently primarily supports English, but most of the open-source models it supports (such as Qwen, DeepSeek, etc.) have strong Chinese understanding and generation capabilities, so you can converse in Chinese.