Privacy

What this is

Kithera.ai is a small, invite-only service for designing 3D-printable parts. This page describes what actually happens to your data when you use it. It is a plain-language description of real behaviour, not legal advice.

Signing in

Sign-in runs through Google Cloud Identity Platform. A successful sign-in sets one cookie in your browser, and that cookie is how later requests are recognised as yours. This service does not keep a separate password store of its own.

Design work leaves the service

This is the disclosure that matters most. When you ask the agent to design or change a part, your prompt, the OpenSCAD source it writes, and the rendered images it looks at are all sent to OpenRouter, which forwards them to whichever model is doing the work. That is not an incidental detail — it is how the agent designs anything at all: it can only write and check a design by sending the source and the render to a model that can read them.

Projects

If you save a named project, its source files, its view state, and a thumbnail image of the model are stored in Firestore. A project belongs to the account that saved it; no other account can read it.

Usage

Usage is metered per account: how many tokens your requests have used, and how many renders you have sent the agent to look at. That figure enforces a budget. It is not used to build a profile of you.

Asking for an invitation

The invitation form keeps the email address you type, when you submitted it, the referrer (the page that sent you here), a rough description of your browser and device, and the Accept-Language value your browser sends. It does not keep your IP address. A rate limiter holds one in memory, briefly, to keep the form from being abused — nothing about it is written down.

Cookies

This service sets exactly one cookie: the session cookie that keeps you signed in. There is no analytics cookie, and nothing about your visit is tracked. Until you click to play the video on this page, no third-party cookie is set at all.

The video

The video on this page does not load until you click it. Before that click, this page makes no request to Vimeo. Clicking it loads Vimeo’s player in your browser, which means Vimeo sees that request the way any web server sees any request, and may set cookies of its own from that point on.

Asking for deletion

To ask for your data to be deleted — an account, a project, or a waitlist entry — contact the person who invited you, or reply to the message that invited you. With a handful of accounts, a request like this is handled directly, not through a form.