Your data lives on your phone.
Reserve runs entirely on your device. The app does not have a server, an account system, or analytics. We do not collect your name, email, body weight, food logs, activity history, or anything else.
If you connect Apple Health, Reserve reads your weight and active-energy samples directly from HealthKit on this device. Those reads never leave your phone. We do not transmit them anywhere.
Reserve stores your profile, weight history, food log, and activity log in the operating system's standard local storage (UserDefaults) on this device only.
If iCloud Key-Value Storage is enabled and you are signed in to iCloud on the device, Reserve mirrors your weight log and activity log to your private iCloud container so you can move between iPhone and iPad. This data is encrypted by Apple in transit and at rest, and only your Apple ID can access it. We cannot.
Nothing. There is no third party we share data with. There is no advertising network. There is no “trusted partners” list. We do not sell, license, or transmit your data to anyone.
Reserve uses Sentry to receive anonymous crash reports so we can fix bugs. A crash report contains technical details about the failure (device model, OS version, and the code path that crashed). It does not include your name, your health data, your food logs, or anything that identifies you.
HealthKit access is opt-in. You can grant or revoke specific permissions at any time in iOS Settings → Privacy & Security → Health → Reserve.
When you log food or exercise in Reserve, we mirror those entries back to Apple Health (if you've granted write permission) so the rest of your health ecosystem stays consistent. This write-back is local to your device — Apple Health is your data, not ours. Health data is never used for advertising and is never sold.
Local notifications (fasting milestones, daily check-ins, goal-reached) are scheduled on your device using Apple's standard notification system. They are not push notifications from a server — Reserve has no server. You can disable them in Profile → Preferences → Notifications, or in iOS Settings → Notifications → Reserve.
Profile → Preferences → Reset All Data wipes the locally-stored snapshot, the activity log, the nutrition log, and the iCloud mirror (if enabled). Your profile details (name, birth date, weight, goal) are preserved unless you also reset them manually.
Deleting the Reserve app from your device removes everything else, including the profile.
For privacy questions or data requests, email briankq@icloud.com.
Last updated: June 2026