Datum: Body Fat Calculator Privacy Policy

Last updated: October 10, 2026

Aurora Apps / Daniel Steel ("we," "us," "our") is committed to protecting your privacy. This Privacy Policy explains what Datum: Body Fat Calculator (the "App") does with information when you use it on your iPhone, who receives it, and the choices you have.

By using the App, you agree to the practices described in this Privacy Policy.

1. Information the App Handles

To work, Datum: Body Fat Calculator sends some information off your iPhone. It goes only to the recipients described in this policy: our install notification (section 3) and the service providers in section 4. Anything the App does not send to these recipients stays on your iPhone.

2. Information We Do Not Collect

• We do not sell your personal data, and we do not share it with data brokers.
• The App has no accounts or sign-in, so we do not ask for your name, email address or password.
• The App does not track you. It does not combine data about you with data from other companies' apps and websites, and it does not ask for App Tracking Transparency permission.
• The App shows no advertising and does not share data with advertisers.

3. Install Notification

The first time you open the App, it sends one anonymous message to a small server we run on Vercel, which forwards it to an internal channel in our team's Slack workspace. The message contains only:

• app version
• OS version
• device model
• region
• language
• build channel

Why we send it. Lets the developer count installs; contains no identifier and no user content.

The message is sent once for each installation of the App. As with any request over the internet, the server can see your device's IP address when the message arrives; we do not store it with the message or use it to identify you. The message is not used for advertising or tracking. We keep it only as long as we need it to count installs.

4. Service Providers & Apple

Datum: Body Fat Calculator uses the following service providers. Each one receives only the information described here, and handles it under its own privacy policy.

• RevenueCat. Processes the subscription and restores it on other devices. It receives an anonymous app user ID and App Store purchase receipt data. RevenueCat privacy policy.
• Aurora Apps AI service (Google Cloud and Vertex AI Gemini). Optional. Reads a neck-down copy of one photo to estimate a body-fat range. Not stored or logged. It receives the cropped photo, an app-generated install id and Apple's App Attest proof that the request comes from the genuine app. Aurora Apps AI service (Google Cloud and Vertex AI Gemini) privacy policy.

Apple runs the App Store and your device's operating system. It handles your purchases (see section 5). If you have chosen to share analytics with app developers in your device settings, Apple may give us anonymous crash and usage statistics. We do not control how Apple handles your data, which is covered by Apple's privacy policy.

Some of these providers, and the server used for the install notification, may process information outside the UK and European Economic Area, including in the United States. Where they do, they rely on safeguards such as standard contractual clauses or the EU-US Data Privacy Framework.

5. Purchases

Datum Pro (monthly) is an auto-renewing subscription. Payment is handled entirely by Apple through your Apple Account. We never see or store your card or other payment details.

• RevenueCat also takes part in your purchase and receives an anonymous app user ID and App Store purchase receipt data.

6. Children's Privacy

Datum: Body Fat Calculator is not intended for children under the age of 13 (or the equivalent minimum age in your jurisdiction). We do not knowingly collect personal data from children. If you believe a child has given us personal data, please contact us at support@aurorapps.com and we will delete it.

7. How Long We Keep Information & Deleting It

• Install notification (section 3): kept only as long as we need it to count installs.
• Service providers (section 4): information they hold is kept under their own policies. You can contact them directly, or email us and we will help.
• Purchases: Apple keeps your purchase records under its own policies.

Deleting your data

Datum has no account and nothing is sold or used for ads. Your date of birth, sex, height, weight, photos and measurements stay on your iPhone, apart from one neck-down photo sent to our AI service only after you allow it. Apple Health is read only, only when you tap import, and is never written, sent or used for ads or data mining. Delete a check-in in Check-ins, or use Settings > Delete all my data. Deleting the app does too, apart from an anonymous app ID (kept as a hash for 14 days on our side) and a note of which check-in used your free result, which stay in the Keychain. Adults only.

8. Your Rights & Choices

Depending on where you live (for example in the UK or EU), you may have the right to access, correct, delete, restrict or object to our use of personal data we hold about you, and to receive it in a portable format. To use any of these rights, email us at support@aurorapps.com.

Because the App has no accounts, the information we receive is not linked to your name or email address, so we may not be able to find data that relates to you. If we cannot, we will tell you.

You can change or withdraw any permission you have given the App, such as access to your photos or notifications, at any time in the Settings app.

If you are unhappy with how we handle your data, you can complain to the UK Information Commissioner's Office at ico.org.uk, or to the data protection authority where you live. We would appreciate the chance to help first, so please contact us.

9. Changes to This Privacy Policy

We may update this policy from time to time. When we do, we will change the "Last updated" date above. Continued use of the App after any modifications constitutes acceptance of the updated policy.

Contact

For any privacy-related questions or concerns, please contact us at support@aurorapps.com.