Tideglass — Privacy Policy
TL;DR
- Tideglass uses your watch's location only on your device to find the nearest tide station.
- We do not collect, transmit, store, or share any data.
- The app works fully offline.
What we access
Device location. When you open Tideglass, the app reads your watch's GPS coordinates to determine which tide station is closest to you.
This is the only piece of data the app accesses. We do not collect any of the following:
- Personal information (name, email, phone, address)
- Device identifiers (IDFA, IDFV, advertising IDs)
- Usage analytics or telemetry
- Crash reports (beyond what Apple provides to developers automatically and anonymously through the system)
How location is used
When you open the app:
- Your watch's location services report your latitude and longitude.
- Tideglass searches a database bundled with the app (~8,000 tide stations worldwide) for the closest station.
- Tideglass computes tide predictions using harmonic constants from that station.
Steps 1, 2, and 3 happen entirely on your watch. No internet connection is required. No data leaves your device.
Permissions
Tideglass requests "Location When In Use" permission. You can grant or revoke this at any time in:
Watch app on iPhone → My Watch → Tideglass → Privacy & Security → Location Services
If you deny location access, the app cannot determine which tide station is nearest and will not display predictions.
Data shared with third parties
None. There is no sharing because there is no collection.
Third-party services
Tideglass does not use any third-party SDKs, analytics platforms, crash reporting services, advertising networks, or tracking technologies.
Tide data attribution
Tide harmonic constants come from the open OpenWaters tide database under CC BY 4.0. The prediction algorithm is adapted from Neaps (MIT). Upstream sources include NOAA (US public domain) and TICON-4 (CC BY 4.0).
Disclaimer
Tide predictions in Tideglass are intended for recreational use only. Do not rely on them for marine navigation, commercial operations, or any safety-critical decision. Always consult official publications from your national hydrographic office.
Contact
Questions about this policy: hello@panic-kit.com
Changes
If we update this policy, the "Last updated" date above will change. The current version will always be available at this URL.