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Donum: Acreage Area Calculator
Hugo Software

Terms of Service

Last updated: 5 November 2026

These terms govern your use of Donum ("Donum", "the app"), published by Hugo Software. By installing or using the app you accept them. If you do not accept them, do not use the app.

1. What Donum is — and what it is not

Donum measures land area, distance and perimeter using your phone's GPS and a map you draw on. It is a consumer tool, not a surveying instrument.

Read this carefully:

  • Consumer phone GPS typically drifts 3 to 10 metres, and more under tree cover, near buildings, in poor weather or with a weak sky view. On a plot boundary that is several metres of uncertainty in every direction.
  • Results from Donum are not an official cadastral survey. They must not be used for title deeds, land registry filings, boundary disputes, planning applications, court proceedings, insurance claims, or any other legal or official purpose.
  • Donum is not a substitute for a licensed surveyor. Where a legally binding measurement is needed, engage one.
  • The app shows the accuracy your phone reports (the ± value). That number is your phone's own estimate, not a measured error; the app cannot know the true boundary.

You are responsible for deciding whether a measurement is fit for what you intend to do with it.

2. Licence

We grant you a personal, non-exclusive, non-transferable licence to use the app on devices you control. You may not resell, sublicense, reverse-engineer or redistribute it, except where such restriction is prohibited by law.

3. Donum PRO subscription

The core of the app is free: Area, Distance and Point modes, entering corners by coordinates, up to 5 saved plots, CSV export, copying coordinates and the backup file.

Donum PRO is an auto-renewing subscription that unlocks Walk measuring, unlimited saved plots, KML/GeoJSON/GPX export and import, the PDF plot report, the plot card image, the topographic and high-contrast map layers, plot colours, notes and groups, and comparison with a plot's previous boundary.

  • The available plans, the price in your local currency and any free trial or introductory offer are shown on the purchase screen and in the Google Play purchase window before you confirm.
  • Payment is charged to your Google Play account when you confirm the purchase, or when the free trial ends if a free trial applies.
  • The subscription renews automatically each period until you cancel.
  • You can cancel at any time in the app (Settings → Manage subscription) or in Google Play (Play Store → Profile → Payments and subscriptions → Subscriptions). Cancelling stops future renewals; the subscription stays active until the end of the paid period already started.
  • If a free trial applies, cancelling before it ends costs nothing.
  • Prices may change; you will be told in advance and any change applies from the next period.
  • Refunds are handled by Google Play under its own policy. We can neither charge nor refund you directly.

4. Map data

Maps are provided by OpenStreetMap and related tile providers. Map data is © OpenStreetMap contributors and licensed under the Open Database Licence. We do not control the availability, accuracy or currency of map imagery, and map tiles require an internet connection.

5. Disclaimer and liability

The app is provided "as is" and "as available", without warranty of any kind, to the fullest extent permitted by law. We do not warrant that measurements are accurate, that the app is uninterrupted or error-free, or that map tiles will be available.

To the fullest extent permitted by law, Hugo Software is not liable for any loss arising from reliance on a measurement produced by the app — including financial loss, loss of a crop or a sale, disputed boundaries, legal costs, or any indirect or consequential loss. Nothing in these terms limits liability for death or personal injury caused by negligence, for fraud, or for any liability that cannot lawfully be limited.

If you are a consumer, you keep all statutory consumer rights available to you under the law of your country; nothing here overrides them.

6. Your data

We collect nothing about you and run no server. See the Privacy Policy.

7. Changes and termination

We may update the app or these terms; material changes appear on this page with a new date. You may stop using the app at any time by uninstalling it.

8. Governing law

These terms are governed by the laws of England and Wales, without prejudice to mandatory consumer protection rules of your country of residence.

9. Contact

Hugo Software — [email protected]