Open-source, self-hostable text-to-image diffusion model.
Stable Diffusion is an open-weight text-to-image diffusion model from Stability AI, distinguished from most other image generators by the fact that its model weights are publicly available and can be downloaded and run entirely on a user's own hardware. This has made it the foundation for a large ecosystem of community tools, most notably ComfyUI and Automatic1111, which add node-based workflows, inpainting, upscaling, and fine-tuning interfaces on top of the base model. Because it can be self-hosted, it offers a degree of privacy and cost control unavailable with closed, API-only image generators, and its open nature has enabled a large library of community-trained LoRA fine-tunes for specific styles and subjects. The tradeoff is a steeper learning curve and the need for a capable GPU for reasonable local generation speed.