What is the difference between Stable Diffusion and Flux?

Stable Diffusion is best for Creators wanting open-source AI image generation, while Flux is best for Creators wanting the latest open-source image models. Stable Diffusion starts at Free and Flux starts at Free.

Is Stable Diffusion or Flux cheaper?

Stable Diffusion starts at Free and is free. Flux starts at Free and is free.

Is there a free alternative to Flux?

Both Stable Diffusion and Flux offer free tiers.

Stable Diffusion vs Flux

Stable Diffusion is open-source image generation model that can run locally or in the cloud, while Flux is state-of-the-art open-source image generation model from Black Forest Labs. Stable Diffusion is built for creators wanting open-source ai image generation, whereas Flux targets creators wanting the latest open-source image models.

At a glance

	Stable Diffusion	Flux
Best for	Creators wanting open-source AI image generation	Creators wanting the latest open-source image models
Starting price	Free	Free
Free tier	✓	✓
Open source	✓	✓
Free tier available	✓	✓
Open source	✓	✓
ControlNet	✓	—
Controllable	—	✓
Fast	—	✓
Fine-Tuning	✓	—
High Quality	—	✓
Local Running	✓	—
Open Source	✓	✓

Stable Diffusion

Strengths

Open source and transparent
Open-source codebase gives you full transparency and community-driven development
Fully open-source — you can self-host, audit the code, and avoid vendor lock-in
The core product is free with no paywalled essentials

Weaknesses

May lack some advanced features
Self-hosting is free but requires server maintenance and DevOps knowledge
Fewer built-in features means you may need additional tools to cover gaps
Ecosystem of third-party integrations is smaller than the market leaders in ai image generation

Try Stable Diffusion → Full review

Flux

Strengths

Open source and transparent
Open-source codebase gives you full transparency and community-driven development
Fully open-source — you can self-host, audit the code, and avoid vendor lock-in
The core product is free with no paywalled essentials

Weaknesses

May lack some advanced features
Self-hosting is free but requires server maintenance and DevOps knowledge
Fewer built-in features means you may need additional tools to cover gaps
Ecosystem of third-party integrations is smaller than the market leaders in ai image generation

Try Flux → Full review

The bottom line

Pricing: Both Stable Diffusion and Flux are free, so this decision comes down to features and philosophy rather than budget.

Feature gaps: Stable Diffusion offers ControlNet, Fine-Tuning and Local Running that Flux lacks. Flux brings Controllable, Fast and High Quality that Stable Diffusion does not have. Both share Open Source.

Team fit: Stable Diffusion is geared toward any size teams, while Flux is aimed at individual users and small setups. Pick the one that matches where your team is today and where it is headed — migrating tools later is always painful.

Open source: Both Stable Diffusion and Flux are open source, so self-hosting and code audits are on the table with either choice.

Where each tool shines: Stable Diffusion's biggest strengths are: open source and transparent. open-source codebase gives you full transparency and community-driven development. Flux's biggest strengths are: open source and transparent. open-source codebase gives you full transparency and community-driven development.

Watch out for: With Stable Diffusion, users commonly note that may lack some advanced features. With Flux, the main complaint is that may lack some advanced features.

Choose Stable Diffusion if...

You need a tool built for creators wanting open-source ai image generation
You specifically need ControlNet and Fine-Tuning
You care about open-source codebase gives you full transparency and community-driven development
Your team size fits the any size profile Stable Diffusion is designed for

Choose Flux if...

You need a tool built for creators wanting the latest open-source image models
You specifically need Controllable and Fast
You care about open-source codebase gives you full transparency and community-driven development
Your team size fits the individuals profile Flux is designed for