Privacy Policy
Who we are
Cliff AI, Inc. ("Cliff", "we") makes the Cliff design app and runs a marketplace where buyers order parts, and custom parts from independent machine shops. This policy explains what information we collect, how we use it, who we share it with, and what you can ask us to do with it. Questions go to hello@cliff.ai.
What we collect
If you run a shop: your shop's name, owner, email, phone number and city; the description you write of your shop; your machines, materials, rates and auto-accept rules; your orders, messages, notes and past jobs; and the id of your Stripe account and whether it is ready to be paid out to.
If you buy: the name, company, email and shipping address you give for an order; the parts, files, drawings and messages that belong to the order; and your card's brand and last four digits, with the ids Stripe gives us for your card. Your card number goes to Stripe. We never see it.
From everyone who visits: the IP address and time of each request, in our server logs. For export-controlled orders we also record every view and download: who, when, and from where.
If you make a Cliff account: your email, your password (stored only as a one-way hash) or, if you sign in with Google, the email address and account id Google gives us, and if you give them, your company, your role and what you design; when you accepted our terms; and the devices signed in to your account.
From the Cliff app, usage data, unless you turn usage data off in Settings: its version, your operating system and type of computer, how long it is open, which commands are run, how long they take and whether they work, errors and crash reports, which simulations run, and how many requests AI agents make.
From the Cliff app, your content, unless you turn Privacy Mode on in Settings (it is off unless you turn it on): your questions to the app's assistant and its answers, with the commands it ran; the commands run in the app, with their settings, and error messages; and the designs you open and work on, including their geometry, parameters, history and files, and the parts sent to a manufacturing check. With Privacy Mode on, the app sends your conversations with its assistant only for the safety check described below, and a manufacturing check's parts only to run the check; neither is kept or used for anything else.
What you send us on purpose: bug reports (your words, the app's logs and state, and, if you include them, your design and a screenshot), and designs or sessions you share with us.
Cookies and advertising tags: we set a cookie to keep you signed in. On our website, though not in the app, we use the measuring tags (pixels) of the platforms we advertise on, such as Reddit, to see which ads bring people to Cliff: when you visit our site or make an account after seeing one of their ads, that platform can learn so, through its own cookie and your IP address.
All of this is tied to your account.
How we use it
To run Cliff and the marketplace: to sign you in, run the app's online features and manufacturing checks, show shops their orders and files, price parts, hold and charge cards, pay shops, and send the emails and text messages an order needs.
To improve Cliff and build new products: usage data and your content show what works, what breaks and what to build next.
To train and evaluate AI models, our own and models built by or with others, on your content and usage data from the Cliff app.
To keep Cliff safe: to prevent abuse and fraud, enforce our terms, and keep Cliff from being used for weapons and the other uses our terms forbid. An AI model checks each conversation with the app's assistant, and someone at Cliff reviews any it flags.
To advertise Cliff and measure which ads work.
To write to you about your account, updates to the app and changes to these documents. You can unsubscribe from anything that is not about your account.
To meet our legal duties, such as tax, export control, sanctions and record keeping.
Who we share it with, and selling data
Shops and buyers see each other's order information. The shop you order from gets your order, its files, and the name and address the parts ship to. Buyers see a shop's name, city, profile, and its record of how it answers orders.
Service providers see what they need to do their part. Stripe processes payments and payouts. Amazon Web Services hosts the service, stores files and backups, and sends our email. Twilio sends text messages to shops that ask for them. Anthropic runs the AI model that checks conversations with the app's assistant. When you open one of our pages, your browser also fetches fonts from Google Fonts and the 3D viewer from jsDelivr, which see your IP address.
Advertising platforms we advertise on, such as Reddit, receive through their tags on our website that a visit or a new account followed one of their ads.
AI developers and other data partners: we may share, license or sell your content and usage data to third parties, such as companies that develop AI models, for them to train, evaluate and improve their models and products. Under some U.S. state laws this is a "sale" or "sharing" of personal information; see Your choices for how to opt out. This covers what the Cliff app sends and what you send us about it. Orders, their files, and shops' rates and records are used only as the Buyer Terms and the Shop Agreement say.
De-identified and aggregated data, which no longer identifies you, may be shared, licensed or sold without limit.
If Cliff is sold or merges, or its assets are transferred, your information goes with the business, under this policy.
When the law requires it, or to protect people, Cliff or our rights.
Your choices
Privacy Mode (Settings, on every plan) stops your content being sent, used to train models, or sold or shared with data partners from the moment you turn it on. It is also how you opt out of the "sale" or "sharing" of your personal information under state laws such as California's. You can also opt out by writing to hello@cliff.ai with the subject "Do not sell or share", which the "Do not sell or share my personal information" link at the foot of our website also explains.
Usage data can be turned off in Settings.
Advertising tags on our website can be blocked with your browser's tracking protection or an ad blocker; Cliff works the same without them.
Opting out does not undo uses already made, such as a model already trained on your content, or data already de-identified.
How long we keep it
We keep your account, usage data and content for as long as we need them for the purposes above, unless you delete them sooner.
Orders, their files and their records are kept while your account is open, and after that for as long as tax, dispute and legal rules require, usually up to 7 years.
With Privacy Mode on, a conversation with the app's assistant is deleted once checked, or after 7 days. A conversation the check flags is kept until someone at Cliff has reviewed it, and as long as we need it after that.
When you delete your Cliff account, we delete it and the personal information tied to it within 30 days, except order records we must keep, data already de-identified, and models already trained. Backups follow within the same time.
Your rights
You can see and download the information we hold about you, and delete your account, from your account page on cliff.ai (the app's Settings link to it). You can also ask us to correct or delete anything, or to opt out of its sale or sharing, by writing to hello@cliff.ai. We answer within 30 days, or sooner where the law says. Asking never affects how we treat you.
Security
Our site is served only over encrypted connections. Passwords, sessions and sign-in links are stored as one-way hashes, never as plain text. Each shop can see only its own orders, and staff access is limited. No system is perfectly secure. If a breach affects your information, we will tell you as the law requires. Cliff is run from the United States, and your information is stored and processed there.
Children
Cliff is not meant for anyone under 16, and we do not knowingly collect information from them.
Changes
We may change this policy. The current version is posted here with its date; this one is 2026-11-12. If a change is significant, we will tell the people it affects by email or in the app before it applies.
Contact
Cliff AI, Inc., 355 1st St, Unit S208, San Francisco, CA 94105. hello@cliff.ai.