What a Green Lawn is a lawn care assistant that helps you decide when to fertilize, mow, overseed, and scarify — based on your local weather and the lawn zones you set up. This policy explains what data the app collects, how it is used, and your rights as a user.
We collect as little as possible. We do not collect your name, email address, or any payment information.
When you create a lawn zone, you provide information about that zone (such as grass type and mowing preferences). This data is stored in the cloud so it is available across app sessions. It is linked to an anonymous user ID — not to your name or any personal identifier.
When you log a fertilizer application, the date and any details you choose to enter are stored. This data is used to calculate how recently you fertilized and adjust the app's recommendations accordingly.
The app uses Firebase Anonymous Authentication. When you first open the app, a random user ID is created automatically. You never register or log in. This ID is used only to keep your data separate from other users' data in the database. It is not linked to your identity.
When you start the free preview period, a timestamp is stored in the cloud linked to your device. This is used to determine when the preview expires. This record cannot be deleted — this prevents the preview from being reset by reinstalling the app. It contains only a timestamp and a device identifier; no personal information.
The app requests your location to fetch local weather data and associate it with your lawn zone. Your approximate coordinates and resolved location name (e.g. "Vejen, Danmark") are stored as part of your lawn zone data in the cloud. Your precise GPS coordinates are not stored — only the coordinates used to identify your general area for weather lookups. This data is linked to your anonymous user ID, not to your identity.
If the app crashes, an anonymised crash report is sent to Firebase Crashlytics. This includes technical information such as your device type, operating system version, and a stack trace. It does not include any of your lawn data or personal information.
| Purpose | Data used |
|---|---|
| Providing personalised recommendations | Lawn zone data, fertilizer logs, location (not stored) |
| Keeping your data across sessions | Anonymous user ID |
| Enforcing the free preview period | Grace period timestamp + device identifier |
| Fixing bugs and improving stability | Crash reports (anonymised) |
We do not use your data for advertising. We do not sell your data. We do not share your data with third parties except as described in §4.
To provide the app, we use the following services:
Your lawn data and fertilizer logs are retained as long as you use the app. You can delete individual lawn zones from within the app, which removes all associated data. If you want your anonymous account and all associated data permanently deleted, contact us at devjakobsen@gmail.com and we will process the request within 30 days.
The grace period record is retained indefinitely. It contains only a timestamp and device identifier — no personal data.
Crash reports are retained by Firebase Crashlytics for 90 days by default.
If you are located in the EU or EEA, you have the following rights under GDPR:
To exercise any of these rights, contact us at devjakobsen@gmail.com.
This app is not directed at children under 13 and we do not knowingly collect data from children.
If we make material changes to this policy, we will update the effective date at the top. Continued use of the app after changes are published constitutes acceptance of the updated policy.