app · Stability AI (models); Comfy Org / comfyanonymous (the ComfyUI interface)
Stable Diffusion 3.5 + ComfyUI
Stable Diffusion 3.5 (Stability AI, October 2024, still the current open-weight line in mid-2026) ships in three sizes — Large (8B), Large Turbo (a faster distilled version), and Medium (2.6B, tuned for consumer GPUs) — and runs natively in ComfyUI, the node-based workflow app that is now the de facto standard local interface for it. Instead of one text box, ComfyUI gives you a visual pipeline: chain a base generation into an upscaler, a ControlNet, a LoRA, or a custom model, one node at a time, and save the whole graph to rerun later. Under the Stability AI Community License, both the weights and your generations are free — including commercial use — for any individual, lab, or organization earning under $1M in annual revenue; above that, an Enterprise license is required. For a Heidelberg lab or student project this is the only option here where nothing — no prompt, no image — ever leaves your own machine.
What it can help with
- node-graph workflow
- offline generation
- image upscaler
- controlnet integration
- lora fine-tuning
- gpu inference
- free commercial use