Stable Diffusion
The open-source image AI — unlimited free generations on your own hardware, no restrictions.
Quick Specs
| Developer | Stability AI (open-source community) |
| Headquarters | London, UK (Stability AI) / Decentralized (community) |
| Category | Image Generation |
| Pricing | Free |
| Free Tier | Unlimited (run locally) |
| Auth Method | None (local) / API Key (Stability AI API) |
| API Available | ✅ Yes |
| Format | Local WebUI / REST API |
| China Access | ✅ Works in China |
| Last Tested | June 2026 |
What Is Stable Diffusion?
Stable Diffusion is the open-source foundation model that sparked the AI image generation revolution. Unlike Midjourney or DALL-E 3, it runs locally on your own hardware — meaning unlimited generations, zero cost after setup, and no content restrictions imposed by a third party. The base SDXL and SD 3.5 models are available for free download; the community has produced thousands of fine-tuned models for specific styles, subjects, and use cases.
The most popular way to run Stable Diffusion locally is via Automatic1111 (a web UI) or ComfyUI (a node-based workflow tool). Both run in your browser but process images on your local GPU. A GPU with 6GB+ VRAM (Nvidia RTX 3060 or better) can generate 512×512 images in 2-5 seconds. Without a dedicated GPU, you can still run on CPU — just much slower.
Stability AI also offers a cloud API for those who want Stable Diffusion quality without local setup. The Stability AI API provides access to SD3.5 Large, SDXL, and Flux models — ideal for developers who want to build image generation into apps without running their own infrastructure. Pricing starts at $0.03 per image.
Key Features
Stable Diffusion Pricing (2026)
Local (Free)
$0- ✓ Unlimited generations
- ✓ All models and LoRAs
- ✓ No content restrictions
- ✓ Full control
- ✓ Requires GPU (6GB+ VRAM)
Best for: Developers, power users with GPU
Stability AI API
From $0.003/image- ✓ SD3.5 Large
- ✓ SDXL
- ✓ Flux models
- ✓ No GPU needed
- ✓ REST API
Best for: Developers without local GPU
DreamStudio (Cloud UI)
Pay-per-credit- ✓ Web interface
- ✓ SDXL + SD3 access
- ✓ 25 free credits on signup
Best for: Casual users without local setup
Stable Diffusion: Pros & Cons
+ Pros
- ✓Completely free when run locally
- ✓No content restrictions — full creative freedom
- ✓Thousands of community fine-tuned models (civitai.com)
- ✓Works in China — runs offline, no internet required
- ✓ControlNet for precise composition control
- ✓Active open-source community with constant improvements
− Cons
- ✗Requires technical setup (Automatic1111 or ComfyUI)
- ✗Needs GPU for practical use (CPU is very slow)
- ✗Output quality below Midjourney V7 for artistic style
- ✗No guaranteed support — community-maintained
Best Use Cases for Stable Diffusion
NSFW Content Creation
The only major image AI with no content restrictions when run locally. Adults use custom fine-tuned models for unrestricted generation.
Product Mockups at Scale
Generate hundreds of product variations via the API at $0.003/image — impossible at scale with Midjourney.
Style-consistent Illustration
Fine-tune on your own art style or brand using DreamBooth or LoRA training. Midjourney doesn't offer this.
Privacy-sensitive Generation
Legal, medical, or proprietary concept visualization where you can't upload images to third-party cloud services.
How to Get Started with Stable Diffusion
- 1
Check your GPU VRAM: 6GB minimum, 8GB+ recommended (Nvidia GPU required for fast generation)
- 2
Install Python 3.10 and Git
- 3
Clone Automatic1111: git clone https://github.com/AUTOMATIC1111/stable-diffusion-webui
- 4
Run webui.bat (Windows) or webui.sh (Mac/Linux)
- 5
Download a model: visit civitai.com, download a .safetensors file, place in models/Stable-diffusion/
- 6
Go to localhost:7860 in your browser and start generating
✅ Works in China: Stable Diffusion in China
Stable Diffusion is accessible from mainland China without a VPN.