Thermik privacy policy
Thermik shows your flights, hikes, rides and ski tours as a 3D replay over real terrain. It reads the flight files you give it and keeps everything on your phone. There is no account, no advertising, no analytics and no crash reporting.
Your flights stay on your phone
- Thermik reads IGC, GPX, KML, KMZ and ZIP files that you import, open or share to it. Files you pick or share are copied into the app's private storage; a folder you import is read where it is.
- Your logbook (sites, glider names, corrections) is stored only on your phone.
- Thermik never uploads your flight files or your logbook anywhere.
- Thermik does not use your phone's location. It has no location permission.
What leaves your phone, and when
Only when you tap Download on a flight, Thermik fetches terrain, aerial imagery and place names for the area around that flight. These requests contain the map tiles or the rectangle covering the flight area, which reveals roughly where the flight took place. Like any web request, they also carry your IP address. They go, over encrypted HTTPS, to:
- AWS Terrain Tiles (Amazon Web Services) — elevation
- EOX IT Services — Sentinel-2 cloudless imagery
- For flights in these countries: basemap.at (Austria), swisstopo (Switzerland), Bayerische Vermessungsverwaltung (Bavaria), IGN (France) — aerial photos
- OpenStreetMap Overpass servers (overpass-api.de, overpass.kumi.systems, overpass.private.coffee) — names of peaks, towns and passes
These providers answer the request; Thermik sends them nothing else. Their own privacy policies govern their server logs. Downloaded tiles are kept on your phone so the flight works offline afterwards.
On iPhone
- Importing. When you pick files or a folder in the Files app, Thermik copies each track file into the app's own storage, unchanged. For a folder, the app also keeps a link to it so it can pick up new files when you sync; it never writes to that folder.
- Sharing and export. Pictures, videos and exported files go out only through the iOS share sheet, to the app or person you choose. Thermik does not ask for access to your photo library.
- No location access. Thermik on iPhone has no location permission and never records a track.
- Network requests are the same as on Android (see above). They identify the app as
Thermik/<version> (iOS)with a contact address, as the map and terrain providers ask. - App Store privacy label. Because terrain requests reveal roughly where a track was recorded, the App Store label lists "Coarse Location — App Functionality, not linked to you, not used for tracking". Nothing else is collected.
- Deleting your data. Delete a track in the logbook, or delete the app: that removes all tracks, the logbook, settings and downloaded terrain from your iPhone. Backups you saved to Files or elsewhere stay where you put them.
Sharing
When you share a picture, video or file (GPX, KMZ, IGC), Thermik hands it to the app you choose in the share sheet. Nothing is sent unless you do this.
Deleting your data
Downloaded terrain and imagery can be cleared in Settings → Storage. On Android, uninstalling Thermik or clearing its data in Android settings deletes the logbook and everything else the app stored. Your original flight files in folders you imported are never changed or deleted.
Children
Thermik is not directed at children and collects no personal data from anyone.
Changes
If this policy changes, the new version is published on this page with a new date.