AUTOMATIC1111 (stable-diffusion-webui)
The original SD power-user webUI.
Open Source 4–12 GB VRAM
- Min VRAM
- 4 GB
- GPU class
- Mid GPU
- Quant
- FP16
Actually FreeNo SignupOpen SourceWatermark-Free
Stable Diffusion WebUI Forge
Optimized A1111 fork for low-VRAM cards.
Open Source 4–8 GB VRAMRuns locally
Actually FreeNo SignupOpen SourceWatermark-FreeHobbyist-FriendlyWorkflow Engine
Visit Stable Diffusion WebUI ForgeUpdated 2026-05-03 · Direct link
Hardware requirements
Runs locally · Entry GPU (6–8 GB)
Min VRAM
4 GB
Rec. VRAM
8 GB
Min RAM
16 GB
Rec. RAM
32 GB
Disk
30 GB
GPU class
Entry GPU
CUDA 12.xNo Apple SiliconGPU RequiredQuant: FP16, FP8, NF4 +1
Designed for 4–8 GB cards. Flux NF4 runs on 6 GB.
Screenshot placeholder · Stable Diffusion WebUI Forge
What is Stable Diffusion WebUI Forge?
A high-performance fork of AUTOMATIC1111 with major memory optimizations. Runs SDXL on 4–6 GB cards and includes built-in Flux support without extensions.
Pros & cons
Pros
- Best low-VRAM SDXL/Flux performance
- Drop-in for A1111 users
- Built-in Flux NF4
Cons
- Extension compatibility is a moving target
- Less active than upstream A1111
What's actually free?
Fully free / OSS.
✓ Actually FreeNo SignupOpen SourceWatermark-Free
Alternatives
ComfyUI
The nodal workflow engine for serious diffusion.
Open Source 6–16 GB VRAM
- Min VRAM
- 6 GB
- GPU class
- Mid GPU
- Quant
- FP16
Actually FreeNo SignupOpen SourceWatermark-Free