Stability AI builds the Stable Diffusion model family and sells access as pay-as-you-go API credits, at about three cents an image, with no monthly subscription for the image product. What decides whether it suits you is whether you want a metered API and a self-hostable license rather than a flat plan, and how much you value a full editing toolkit alongside the model.
What is Stability AI?
Stability AI is a company headquartered in the United Kingdom. It builds its own Stable Diffusion models rather than offering other companies' models, and makes them available through a web playground, a developer API, or a self-hosted deployment under its Community License, free for individuals and organizations under $1M in annual revenue.
What Stability AI generates
The newest model is Stable Diffusion 3.5. Base generation from Ultra, Core and SD3.5 outputs around 1 megapixel, and text inside an image is a named strength of the Ultra model. There is no feature for keeping a character consistent across images.
Generation is steered with a seed, a negative prompt, aspect ratio control, and structure or sketch guidance to control pose and composition. Editing covers inpainting with a mask, outpainting, background removal, style transfer from a reference image, and upscaling: a fast 4x upscaler up to 4 megapixels, or the Conservative and Creative Upscalers that reach 4K resolution. There is no vector output and no batch generation, and every endpoint returns one image per request. An API gives programmatic access to all of it, and custom model training is available as an Enterprise self-hosted upgrade rather than on the standard Platform API.
Stability AI pricing: what each plan gives
There is no subscription plan and no recurring free tier; the 25 credits given at signup are a one-time bonus, not an ongoing allowance. Access runs on pay-as-you-go credits at $0.01 each, and Stable Image Core generates at a flat 3 credits, $0.03, per image. Self-hosting is priced separately: the Community License is free for individuals and organizations under $1M in annual revenue, and the Enterprise self-hosted license, which adds custom model training, has no listed price and requires contacting sales.
Rights and privacy
Stability AI assigns you all right, title and interest in the output, so you own what you generate, and the Community License covers commercial use for revenue under $1M. Its terms have you indemnify Stability, not the other way round. Training on your inputs and outputs happens by default, and you can opt out of it. Stability AI holds a SOC 2 Type II and SOC 3 audit and relies on the European Commission's adequacy decisions for GDPR. Support runs through email and a help center.
Who Stability AI suits
Stability AI suits developers who want metered, pay-as-you-go access to Stable Diffusion with a full editing toolkit, inpainting, outpainting, background removal and 4K upscaling among it, or teams that want to self-host the model under a free license while staying under the $1M revenue threshold.
It suits less well anyone who wants a recurring free plan to generate on an ongoing basis, since the signup credits are a one-time bonus, or anyone who needs a character to stay consistent across a set of images, since no such feature is offered.
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How Stability AI compares
Stability AI scores 6.5 out of 10 among the AI image generators we rate. These three do the same job and are the closest to it, compared on what each vendor publishes.
Midjourney
Stability AI lets you self-host under its Community license, something Midjourney does not offer at all. Stability AI also ships a public API and one-action background removal, both missing from Midjourney. Midjourney counters with character consistency across images and a batch of generations in one run, while Stability AI's API returns one image per request and has no character or face consistency feature.
Pick Midjourney if you want character consistency or images generated in a batch.
Pick Stability AI if you want self-hosting, an API or background removal built in.
Adobe Firefly
Pay-as-you-go credits with no monthly plan are how Stability AI prices access, and its one-time signup bonus is not a recurring free tier; Firefly, by contrast, has a standing free plan. Stability AI lets you self-host under a Community or Enterprise license, an option Firefly does not offer. Firefly answers with character consistency across images and true vector exports, capabilities missing from Stability AI's own API reference.
Pick Adobe Firefly if you want a free plan plus character consistency and vector exports.
Pick Stability AI if you want to self-host under a Community or Enterprise license.
Recraft
Recraft has no self-hosting option, while Stability AI offers one under a Community or Enterprise license; Stability AI also takes pose, sketch or depth map input that Recraft's own docs don't mention. Recraft has a free plan, though commercial rights need its $12 a month Basic tier, while Stability AI has no free plan and runs on pay-as-you-go credits instead. Recraft answers with true vector exports and a batch of images in one run, against Stability AI's single image per request.
Pick Recraft if you want vector exports or several images generated at once.
Pick Stability AI if you want self-hosting or pose and depth map control.
Frequently Asked Questions
How much does Stability AI cost?
There is no subscription. Credits cost $0.01 each, and Stable Image Core generates at a flat 3 credits, $0.03, per image. Signup includes 25 free credits as a one-time bonus rather than a recurring free tier.
What resolution can Stability AI generate at?
Base generation from Ultra, Core and SD3.5 outputs around 1 megapixel. Reaching 4K resolution requires a separate call to the Conservative or Creative Upscaler.
Can I self-host Stable Diffusion?
Yes. The Community License lets individuals and organizations under $1M in annual revenue deploy the models in their own environment for free. An Enterprise self-hosted license, with no listed price, adds custom model training.
Do I own what Stable Diffusion generates?
Yes. Stability AI assigns you all right, title and interest in the output. Its terms have you indemnify Stability rather than Stability indemnifying you.
