ComfyUI's node graph is where workflows are built, not where pictures get made, and HEISS UI is the calm studio that sits on top of your ComfyUI server for the daily prompt, wait, look, tweak loop. Thirty model families work out of the box, from SD 1.5 and SDXL to Flux.2, Qwen-Image, Krea 2, and Wan 2.2, and missing text encoders, VAEs, or node packs each get a Download button, with Get all for the lot. Pick 2K and the model draws at 2048 in one run with no upscale in between, or send any finished picture to 2K or 4K with SeedVR2 in one click. Import your own workflow and it becomes clean controls over the same graph, with usual inputs connected and guesses marked for review. Paint over part of a picture and say what it becomes, and only that part changes, with inpainting across 18 image families and no extra nodes. The gallery auto-groups ten takes of one idea into a single tile, and opens on your phone while your rendering machine does the work. A Hidden vault locks private images behind Touch ID, Windows Hello, or a password; new PNGs can carry Civitai-ready metadata, and Zen mode shows only prompt and picture. Run it beside ComfyUI with Docker or npm on port 8787, or point it at ComfyUI on another machine. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. MIT licensed.