Last updated: October 14, 2026 · Effective: October 14, 2026
This policy covers O-Ring Size Finder only. Presser Foot Identifier uses its own privacy policy. Sunglasses Identifier uses its own privacy policy. For Pesos to Dollars Conversion + and Euros to Dollars Conversion +, see Privacy (conversion apps).
Introduction
This Privacy Policy explains how Dmitriy Andrianov ("we," "us," "our"), based in the United States, handles information when you use O-Ring Size Finder (the "App"). By using the App, you agree to this policy together with our Terms of Use.
We design the App to work with minimal personal data. We do not sell your personal information. The App has no user accounts and no server-side database of your activity.
Information we process
Local data on your device. The App stores your last 30 size checks (a thumbnail of the photo you provided plus the size report), onboarding progress, the time of your last free size check, and rating-prompt state using your device's storage. That information stays on the device until you delete the App, clear its data, or tap Clear in History. It is never uploaded to us.
Photos you submit for sizing. When you take one photo with the in-app camera or choose one photo from your photo library, the App sends that image to our backend (a Supabase Edge Function that we operate), which forwards it to Google's Gemini AI service to estimate the O-ring size. The image is processed to generate a result and is not stored by us beyond what is necessary to return that result to your device; our function keeps no copy and our logs contain no image data. Google's processing of the image is governed by Google's terms and privacy notice (linked below). Only submit photos you are allowed to share.
Photos, faces, and biometrics
The App is for sizing an O-ring from a photo taken next to a ruler or coin. We do not use Face ID, TrueDepth, ARKit face tracking, or any API whose purpose is to capture face geometry or biometric templates, and we do not build facial-recognition profiles. If a face or other personal detail appears incidentally in a photo you submit, it is handled only as described under Photos you submit for sizing.
Purchases. If you buy a subscription, the payment platform (for example, Apple) processes payment. We use RevenueCat to validate entitlements and manage premium access. RevenueCat receives transaction-related identifiers and similar data needed to operate purchases.
Support email. If you email us, we receive your address, message content, and metadata your mail system sends.
Third-party services
- Apple Inc. — App Store, in-app purchases, device permissions. Apple Privacy Policy
- RevenueCat — subscription and entitlement management. RevenueCat Privacy
- Google — the Gemini AI service that reads the O-ring photo and the scale beside it. Google Privacy Policy
- Supabase — hosts the backend Edge Function that relays requests to Google. Supabase Privacy
If we add analytics, advertising, or other tools in a future release, we will update this page and, where required, in-app notices.
Diagnostics and log-type data
Our backend logs request metadata only (a random request id, number and size of images, timing, and a coarse outcome such as "success" or "malformed output"). It never logs the images themselves, the full prompt, or the full report. Your device or third-party libraries may generate crash and diagnostic information under the relevant platform or SDK provider's policies.
Cookies and similar technologies (web)
If you visit this documentation site, your browser may store cookies or similar data as described by the host (for example, GitHub Pages).
Security
We rely on HTTPS transport encryption and on reasonable safeguards through our service providers. API credentials for Google are held only on our backend, never in the App. No electronic storage or transmission is completely secure.
Children's privacy
The App is not intended for children under 13 in the United States, and we do not knowingly collect personal information from children under 13.
U.S. state privacy rights
Depending on where you live, you may have rights to access, delete, or opt out of certain processing of personal information. Because the App stores your data locally, you can delete it directly in the App. For anything we hold (support email), contact us.
Changes to this policy
We may update this Privacy Policy from time to time. We will post the new version on this page and revise the "Last updated" date.
Contact
Dmitriy Andrianov
United States
andrianventures@gmail.com