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
Best AI tools for build node graphs
Nodal & graph-based AI workflow builders.
Hardware:
7 tools
ComfyUI-Manager
Install, update, and govern ComfyUI custom nodes.
Open Sourcevia comfyui
Actually FreeNo SignupOpen SourceWatermark-Free
Stable Diffusion WebUI Forge
Optimized A1111 fork for low-VRAM cards.
Open Source 4–8 GB VRAM
- Min VRAM
- 4 GB
- GPU class
- Entry GPU
- Quant
- FP16
Actually FreeNo SignupOpen SourceWatermark-Free
SwarmUI
Power-user front-end that wraps ComfyUI.
Open Source 8–24 GB VRAM
- Min VRAM
- 8 GB
- GPU class
- High-end GPU
- Quant
- FP16
Actually FreeNo SignupOpen SourceWatermark-Free
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
InvokeAI
Production-leaning SD studio with canvas & batch.
Open Source 8–16 GB VRAM
- Min VRAM
- 8 GB
- GPU class
- Mid GPU
- Quant
- FP16
Actually FreeNo SignupOpen SourceWatermark-Free
Fooocus
Stable Diffusion XL, dialed to one button.
Open Source 4–8 GB VRAM
- Min VRAM
- 4 GB
- GPU class
- Entry GPU
- Quant
- FP16
Actually FreeNo SignupOpen SourceWatermark-Free