Privacy Policy
Effective May 25, 2026
This is the privacy policy for Weighback™, an iOS application developed by Brian R. Jackson. It describes the data Weighback accesses, what happens to it, and the rights you have over it.
Short version
- Weighback reads your weight measurements from Apple Health. It does not write anything back.
- All processing happens on your iPhone. Weighback does not have servers, does not have an account system, and does not transmit your weight data anywhere.
- Weighback does not track you, run analytics, or include third-party SDKs.
- In-app donations are processed by Apple. Apple shares no personally identifying information with us beyond the anonymous fact that a purchase occurred.
Data Weighback accesses
Weighback requests permission to read body-mass (weight) samples from Apple Health. With your permission, the app reads your weight history and the dates each reading was recorded. This data is used to render the chart, identify milestones, and compute the “weighback” match for your current weight.
Weighback does not request permission to write to Apple Health. It cannot create, modify, or delete any data in Apple Health.
You can revoke Apple Health access at any time in Settings → Privacy & Security → Health → Weighback. Doing so removes Weighback's ability to read your weight data; the app will return to an empty state.
Data Weighback stores on your device
Weighback uses your device's user-defaults storage to remember:
- Your unit preference (pounds vs. kilograms).
- Whether you have previously granted Apple Health read authorization (used to decide which UI to show on launch).
- The cumulative dollar amount you have donated via the in-app donation feature, in cents.
None of these values leave your device. They are tied to the app's sandbox and removed when you uninstall the app.
Data Weighback transmits
Weighback makes no outbound network connections. There is no analytics SDK, no crash reporter, no advertising network, no telemetry of any kind.
When you make a donation, the purchase request is sent from your device directly to Apple's StoreKit servers. Apple processes the transaction. Apple notifies Weighback that the purchase succeeded; the only data Weighback receives is the transaction's verification token, which is used to verify the purchase and is not stored persistently.
Children's privacy
Weighback is not directed at children under the age of 13. We do not knowingly collect personal information from children.
Changes to this policy
If this policy changes materially in the future, the updated version will be posted at this URL with a new effective date.
Contact
Questions about this privacy policy can be sent to brian@jaxzin.com.