Open-source AI image generator you can self-host, fine-tune, and run without a subscription.
Stable Diffusion, made by Stability AI, is the major open-weight image generator: anyone can download the model and run it locally or in their own cloud, fine-tune it on custom data, and use it within the ecosystem of community tools like ComfyUI, LoRA, and ControlNet. The current generation is Stable Diffusion 3.5 (Large, Large Turbo, and Medium), released to run on consumer-grade hardware. Stability AI also offers a hosted API on a pay-per-image credit basis for those who do not want to self-host.
- Open-weight model — download, self-host, and fine-tune for free
- Runs on consumer-grade hardware (SD 3.5 Medium/Large/Large Turbo)
- Large community ecosystem: ComfyUI, LoRA fine-tunes, ControlNet
- No subscription required for self-hosted use
- Hosted Stability AI API available on a pay-per-image credit basis
- Commercial self-hosting license available for enterprise use