Stability AI

Freemium

By AI Bookmarks Editorial Team, Directory editors Last reviewed 2026-10-23

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Generative image, video and audio models with open weights, licensed free for research and paid for commercial use.

Quick facts

Pricing	Freemium
Free tier	Yes — community licence for non-commercial use and small businesses
Platforms	Web, API, self-hosted
Developer	Stability AI
Launched	2019
Website	https://stability.ai

What Stability AI is

Stability AI develops the Stable Diffusion family of image models alongside video and audio models. Its distinctive feature is that many weights are published openly, so you can download a model and run it on your own hardware instead of paying per image. That makes it the default choice for teams that need to keep prompts and outputs on their own infrastructure, fine-tune a model on proprietary material, or build a product without a per-call bill. Alongside the open releases it runs a hosted API and a web interface for people who do not want to manage GPUs. Commercial terms are tiered by company size: research and personal use are free, and commercial use above a revenue threshold requires a paid licence. The trade-off is that quality depends on which model and fine-tune you pick, and running it well needs hardware and some configuration skill.

Best for

Running image generation on your own hardware
Fine-tuning a model on proprietary material
Products that cannot call a third-party API per image

Not ideal for

Teams without GPU capacity or machine-learning experience
Non-technical users who want a finished, guided interface

Pros

Open weights allow self-hosting and fine-tuning
Large ecosystem of community models and tools
No per-image billing when you run it locally

Cons

Licence terms differ by model and change between releases
Output quality varies widely across community fine-tunes
Requires hardware and configuration to run well

Pricing in detail

Models are released under tiered licences: free for research and personal projects, and free for commercial use below an annual revenue threshold, with an enterprise licence required above it. The hosted API and web interface are billed separately, typically by credits rather than by seat. Because licence terms differ between model releases, read the licence attached to the specific checkpoint you intend to use rather than assuming one blanket rule.