Sentinel Privacy Policy
What Sentinel collects, what it doesn't, and the choices you have.
Sentinel is a threshold-alert app for Bluetooth sensors, published by ZEN LABS S.R.L. (Bucharest, Romania). It is built to do one thing well without harvesting your data. This policy describes the data practices of the Sentinel app specifically.
What we collect
Nothing off your device. Sentinel connects directly to your Bluetooth thermometer or sensor over a local connection and compares each reading against your thresholds on the watch itself. Sensor readings are evaluated on-device and are never sent to us or to any server.
What we don't collect
- No account — Sentinel has no sign-up and no login.
- No personal information, contacts, or health data we receive.
- No advertising identifiers and no tracking across apps or websites.
- No analytics that leave your device.
Bluetooth
Sentinel uses Bluetooth solely to read values from the sensor you pair with it. The connection is local between your device and your sensor; no reading leaves your device through us.
StoreKit & purchases
Sentinel is a one-time in-app purchase sold through Apple. When you buy it, Apple processes the payment via your Apple ID using StoreKit. Apple handles your payment details — we never receive or store your card information. We receive only the anonymous transaction status needed to unlock the app on your device.
Third-party SDKs
Sentinel ships without third-party analytics, advertising, or tracking SDKs, and it does not share any data with third parties — including third-party AI services. If we ever add a diagnostics or crash-reporting tool, we will update this policy and the App Store privacy label before it ships, disclose exactly what it collects, and ask for your consent where required.
Data retention
Because Sentinel collects no data off-device, there is nothing for us to retain or delete on a server. On-device data lives only on your devices and is removed when you delete the app.
Your choices
You can turn off notifications in iOS Settings at any time, remove the Watch complication, or delete the app — which removes all of its on-device data. Sentinel is a one-time purchase, so there is no subscription to manage or cancel.
Children
Sentinel is not directed at children and collects no personal information from anyone.
Changes
If this policy changes, we'll revise the "last updated" date above and, where the change is material, note it in the app's release notes.
Contact
Questions about privacy? Email support@zp.digital.
ZEN LABS S.R.L. · Str. Aurel Vlaicu nr. 65, parter, Sector 2, Bucharest, Romania · CUI 51808907 · Reg. Com. J2025035220005.