Comparison
Flux vs Stable Diffusion
Flux: Open source image generator from Black Forest Labs. Stable Diffusion: The open source image model you can run on your own PC.
| Flux | Stable Diffusion | |
|---|---|---|
| Rating | 4.4 | 4.4 |
| Price | Freemium Open models free to run locally; paid Pro versions via API. | Free Free locally (open models). Stability's APIs and services are pay-as-you-go. |
| Free plan | ||
| API available | ||
| Open source | ||
| In Spanish | ||
| No watermark | ||
| Platforms | Web · Windows · Linux | Windows · Linux · Mac · Web |
Flux or Stable Diffusion?
Both are open and run locally, so the choice is technical. Stable Diffusion has by far the larger ecosystem — ComfyUI, LoRAs, ControlNet, CivitAI — and therefore more fine-grained control. Flux is more modern, gives better out-of-the-box quality without as much tweaking and handles text inside images far better.
Choose Flux if…
You want good results without building a complex workflow, or you need legible text in the images.
Choose Stable Diffusion if…
You want total control: fine-tuning models, using ControlNet, LoRAs and the whole community ecosystem.
Flux
- Open source: free when run locally
- Excellent at rendering text inside images
- API available
- Running it locally requires a powerful GPU
- Less artistic polish than Midjourney
Stable Diffusion
- Completely free when run on your own hardware
- Total control: fine-tunable models, LoRAs, ControlNet, no watermark
- Huge community ecosystem (ComfyUI, Automatic1111, CivitAI)
- Running it locally requires a powerful GPU and technical know-how
- The best results require learning prompt engineering and workflows
The differences that actually matter
Recent quality versus a mature ecosystem
Flux is newer and usually comes out ahead on image quality and prompt fidelity, especially with text and hands. Stable Diffusion has years behind it and an enormous ecosystem of derivative models, fine-tunes and extensions that nothing matches. One wins on immediate result, the other on possibilities.
What your machine needs
Flux's powerful versions need a fair amount of video memory. Stable Diffusion has variants that run on modest machines, and that is a very real practical reason to pick it if you are running locally on a mid-range card.
The licences are not the same
Both publish weights, but the terms vary by version and some restrict commercial use or require a separate licence above a certain company size. It is the check most people skip and the one that can cost money later.
Frequently asked questions
Which is better to run on my own machine?
Stable Diffusion, if your graphics card is not high-end: there are lightweight variants, guides for everything and a huge community solving problems. With powerful hardware, Flux gives a better result per generation, especially if you need legible text.
Is Stable Diffusion still worth learning today?
If you want fine control — controlling pose, keeping a character consistent, applying a style you trained yourself — yes, because that tooling ecosystem does not exist for any newer model. If you just want good images from a sentence, it is effort you do not need.