Support
Questions, bug reports and refund questions: [email protected]
Tell us your device model, Android version and what you were doing — it makes a fix far quicker.
Frequently asked
How accurate is it? Your phone's GPS typically drifts 3–10 metres, so a plot edge is uncertain by a few metres. The app shows the accuracy your phone reports (the ± figure) at the top of the screen. That figure is the phone's own estimate, not a measured error. Donum is not an official cadastral survey and cannot be used for deeds, boundary disputes or legal work.
How do I measure a field? Open Area mode and tap each corner on the map. Area, perimeter and edge lengths appear at the bottom. Drag a corner to adjust it, tap a midpoint handle to add a corner, long-press a corner to delete it.
Can I enter corners without tapping the map? Yes, and it is free. Tap the Corners button on the right side of the map and type or paste coordinates, DMS, UTM or a map link. You can edit or delete each corner in the same list.
What is Walk mode? Start it and physically walk the boundary with the screen on; the app records GPS fixes and closes the shape. Recording stops if the screen turns off, so leave "Keep screen on" enabled in Settings. It is a PRO feature. In Settings you can set the minimum step and the accuracy threshold, so poor fixes are ignored rather than silently distorting the shape.
The app closed before I saved. Your unsaved measurement stays on the phone. The next time you open the app it asks whether to continue or delete it.
It says the edges cross. The outline crosses itself, so its area would mean nothing and the app does not show one. Drag the corners until the lines no longer cross. If you save it anyway, files and reports mark it as an invalid boundary.
The map is blank. Map tiles need an internet connection. Measuring and the area calculation work offline, but new map areas will not load without a connection.
Location permission is refused — can I still use it? Yes. Tap corners on the map instead. Only Walk mode and "go to my location" need the permission.
Which units? m², hectare, dönüm (1000 m²), km², acre, square foot, square yard, square mile — and m, km, ft, yard, mile for lengths. Change them in Settings.
How do I export? Save a plot, open Plots, select it and choose Export: GeoJSON, KML (Google Earth), GPX, CSV, a PDF report with a map of the plot, or a plot card image. CSV, copying coordinates and the backup file are free; the rest are PRO.
Where is my data? Only on your phone. We run no server and receive nothing. Uninstalling the app deletes everything, so export anything you want to keep first. Plots → Export → Backup file saves all your plots in one file.
Subscription
Donum PRO is an auto-renewing subscription. The plans, prices and any trial or introductory offer are shown on the purchase screen before you confirm. Manage or cancel it in the app under Settings → Manage subscription, or in Play Store → Profile → Payments and subscriptions → Subscriptions. Refunds are handled by Google Play under its policy.
If you paid but PRO is not on, open Settings → Restore purchase. The same button is at the bottom of the purchase screen. Make sure you are signed in with the Google account you bought it with.