LM Studio is a free desktop app to run local LLMs on your own computer — a private, offline ChatGPT alternative for macOS, Windows, and Linux. Download open models like gpt-oss, Llama, Qwen, DeepSeek R1, Mistral and Gemma from Hugging Face, chat with your documents, and serve an OpenAI-compatible local API. To get started, head over to the Downloads page and grab the installer for your operating system.