Terms of Use
The rules for using privatediffusion.ai and the beta signup on it. Short, and in plain language.
Effective 25 August 2026.
Who these terms are between
This site is operated by Numen Technologies Limited, Work Hub, 77 Camden Street, Dublin D02XE80, Ireland, registered with the Companies Registration Office under company number 677823.
These terms apply to your use of the privatediffusion.ai website. If you do not accept them, please do not use the site. We are not asking you to click anything; using the site is what these terms cover.
The Private Diffusion app for iPhone, iPad, and Mac is covered separately, in the section on the app below.
We publish these terms in several languages. The English version is the one that controls. If a translation and the English text disagree, the English text applies.
What you may do with the site
You may read, quote, and link to this site for your own purposes, personal or professional, subject to the limits below. We are not granting you any ownership in the site, the software, the model catalog, or the brand.
The sample images on this site were generated with Private Diffusion and are ours to publish. They are illustrations of what the app does, not stock photography for you to reuse.
What you may not do
The site and the beta signup behind it run on servers we pay for. Please do not:
- Scrape the site in bulk, mirror it, or wire it into another product or service.
- Work around the rate limit on the signup form, whether by rotating addresses, clearing state, scripting, or any other means.
- Sign up with an email address that is not yours.
- Attempt to defeat, bypass, or attack the bot protection.
- Probe, scan, or overload our infrastructure, or attempt to reach parts of it that are not public.
- Copy, resell, or redistribute our content or our model builds as if they were your own.
We can rate-limit, suspend, or block access when we see abuse, and we will do so without notice when the service is at risk.
The beta
Joining the beta list is not a promise of a place. Invitations go out in batches as spots open, and we may close the list or end the beta at any time.
Beta software is unfinished by definition. It can change, break, or lose data between builds, and features present in one build may be gone from the next.
You can leave the list whenever you like by writing to [email protected]. TestFlight itself is Apple's service, and Apple's terms govern it.
The app
Your use of the Private Diffusion app for iPhone, iPad, and Mac is governed by Apple's Licensed Application End User License Agreement, which applies to every app we publish on the App Store. We do not impose a separate license of our own.
Apple distributes the app and handles payment, including refunds. Questions about the product itself come to us.
The images you generate
Images you generate in the app are created on your device. We claim no ownership of them, and we never see them.
What you may do with an image can still be limited by the license of the model that produced it. Some of the models we publish attach conditions to commercial use, and each model's page on this site records the license it carries. That license, not these terms, governs the question.
You are responsible for what you generate and for what you do with it. Do not use the app to produce unlawful material, or material that infringes someone else's rights.
The models you download
The app runs open-weight models published by other people. We convert, quantize, and publish the builds you download through Apple. A model's published license, when one is provided, governs your use of the model and may govern its output. If a catalog entry records no license, do not assume you have commercial rights.
We do not claim ownership of anyone else's weights, and we grant you no rights in them beyond what their own licenses give you. Check a model's own license before you rely on it commercially.
Privacy
Our Privacy Policy explains what we do with data, and it forms part of these terms.
Our content and trademarks
The text, design, code, and artwork on this site belong to us or to our licensors. Private Diffusion and Numen are our marks. Apple, App Store, TestFlight, iPhone, iPad, Mac, and Face ID are trademarks of Apple Inc. Other product and model names belong to their owners, and we use them to say what our app runs, not to suggest an endorsement.
You may quote and link to our pages with attribution. You may not copy the site wholesale or present our material as yours.
Links and other sites
We link to model pages, licenses, and documentation held by other people. We do not control any of those sites, and we are not responsible for what they publish or how they treat your data. This site embeds no third-party posts or videos.
Disclaimer
The site and the software it points at are provided as they stand and as available. To the extent the law allows, we exclude implied warranties of merchantability, fitness for a particular purpose, and non-infringement, and we do not warrant that the site or the app will be uninterrupted or error-free.
What the app can do depends on your device. A model that runs well on a Mac with a lot of memory may not run at all on an older iPhone, and we describe requirements as accurately as we can rather than promising a result on hardware we have not tested.
Liability
To the extent the law allows, we are not liable for indirect or consequential loss, for lost profits, or for decisions you take on the strength of something the app generated. Nothing in these terms excludes or limits our liability for death or personal injury caused by negligence, for fraud, or for anything else that cannot lawfully be excluded.
Your rights as a consumer
If you are a consumer, you keep every right that the mandatory law of your country of residence gives you. Nothing in these terms takes those rights away or reduces them, and where a term here conflicts with them, your rights win.
Accessibility
We want the site to work for everyone. If something on it blocks you, tell us at [email protected] and we will fix it or find you another way through.
Governing law and where disputes are heard
These terms are governed by the law of Ireland, and the courts of Ireland have jurisdiction.
If you are a consumer in the European Union or the United Kingdom, this does not deprive you of the protection of your local mandatory law, and you may bring proceedings in the courts of the country where you live. There is no arbitration clause in these terms, and you are not waiving any right to go to court.
Changes to these terms
We update these terms when the service changes. The effective date at the top tells you which version you are reading, and we keep a full revision history of this page that we will share on request.
Contact us
Questions about these terms go to: [email protected]