Stable Diffusion
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About Stable Diffusion
Stable Diffusion is the most popular open-source image generation AI, originally released in August 2022 by Stability AI. Unlike DALL-E and Midjourney (proprietary, hosted services), Stable Diffusion is fully open source — users can run it on their own computers (with a capable GPU) or on hosted services. This open nature has led to thousands of community fine-tunes, LoRA models for specific styles, and integrations into countless tools. Stable Diffusion 3.5 (released October 2024) and Stable Diffusion 4 / FLUX models (from Black Forest Labs, founded by Stable Diffusion's original creators) represent the latest generations. SDXL Lightning, SDXL Turbo, and FLUX schnell models offer near-instant generation. Popular tools built on Stable Diffusion include Automatic1111, ComfyUI, Fooocus, and Forge. Stable Diffusion is the foundation of much of the open AI art ecosystem and is freely usable for commercial purposes.
Frequently Asked Questions
Is Stable Diffusion free?
Yes — the models are free and open source. You can run Stable Diffusion locally on a PC with a 6+ GB VRAM GPU (Nvidia RTX 3060 or better is recommended). The models themselves cost nothing. Hosted services that use Stable Diffusion (RunDiffusion, Replicate, Mage.space, Civitai) typically charge per generation or per month. For local use, the only cost is electricity and the upfront GPU cost. Commercial use is permitted under the SAI permissive license.
Stable Diffusion vs Midjourney: which is better?
Midjourney wins for: best out-of-box aesthetic quality, no technical setup, simpler workflow (Discord-based UX). Stable Diffusion wins for: cost (free vs $10-60/month), control (custom models, LoRAs, ControlNet for precise composition), local privacy (your prompts and images stay on your machine), and commercial flexibility. For artists who want quick beautiful images: Midjourney. For technical users, professionals needing precise control, or those who care about local/free operation: Stable Diffusion.