The easiest way to run FLUX & SDXL on your own GPU
Gentastic is a native Windows app for local AI image generation. No ComfyUI node graphs, no config files, no workflows to understand - pick a model, type a prompt, hit Generate. Everything runs on your own hardware.
Free, no installer required - one portable ZIP, unzip and run.
Why Gentastic
Everything you need, none of the setup
Sane defaults for every field, so you can start generating before you know what CFG or a sampler even is.
Zero-config models
Pick a model from the list and Gentastic downloads it from Hugging Face, verifies it, and snaps steps/CFG/resolution to sane defaults automatically.
Text-to-image & image-to-image
Full prompt + negative-prompt control, batch generation, seeds, and saved presets you can recall in one click.
Keep a face across generations
PhotoMaker-based identity lock: give it a reference photo and generate new scenes of that same person - without a training run.
Apply only to your own photos.
Instruction-based image editing
FLUX Kontext & klein editing: describe the change ("put them on a beach") and it edits the photo while keeping everything else - composition, identity included.
A real gallery
Every generation is auto-saved with its full parameters embedded in the PNG - prompt, seed, steps, CFG, sampler, model - browsable with instant thumbnails.
Runs on your GPU, your rules
No account, no cloud queue, no telemetry - generations never leave your machine. Gentastic auto-detects CUDA or Vulkan and picks the fastest backend you actually have.
Under the hood
Built for real GPUs, not just demos
Gentastic runs on stable-diffusion.cpp via GGUF quantized models - small downloads, real performance.
NVIDIA CUDA
GTX 10-series through RTX 50-series. Don't have the CUDA Toolkit? Gentastic can fetch a ~570 MB on-demand CUDA runtime for you - no separate install.
Vulkan
The stable, fast path on AMD GPUs - including unified-memory APUs like the Ryzen AI Max "Strix Halo" / Radeon 8060S. No ROCm install, no Python.
AMD ROCm
Vulkan already covers AMD GPUs today. Native ROCm 7 acceleration is being integrated next, as the upstream StableDiffusion.NET ROCm backend matures and gets validated on real AMD hardware.
Made with Gentastic
Real output, not stock photos
Every image below was generated locally by the app you can download - unedited, straight out of the Gallery.
Your GPU is already fast enough.
Unzip and launch in under a minute. Pick a model - the first download takes a little longer, depending on your connection - then generate. That's the whole setup.