Astrun — Privacy Policy

1. Introduction

Astrun ("Astrun," "we," "us," or "our") is a moon-calendar gardening application developed by Zeinen Technology. This Privacy Policy explains what information Astrun collects, how it is used, who it may be shared with, and what choices you have. By downloading, installing, or using Astrun, you agree to the collection and use of information as described in this Policy.

Astrun is designed with a local-first, minimal-data philosophy: your garden data (plants, journal entries, to-dos) lives on your device by default, and only leaves your device if you explicitly enable our optional Google Drive backup feature.

2. Information We Collect

2.1 Information you provide directly

Profile information: a display name and your self-reported gardening experience level, collected during onboarding.
Garden content: plant records (name, category, planting date, garden location label, frost-alert preference), journal entries (text and optional photos), and to-do items you create.
Photos: images you choose to attach to a plant or journal entry via your device's photo picker. Astrun only receives the specific image you select — it does not have general access to your photo library.
Location (city name only): the city or place name you manually type in to set your garden's location for frost-risk forecasting. See Section 4 for details — Astrun does not access your device's GPS or precise location.
App passcode: if you enable the optional local app-lock feature, a one-way cryptographic hash (SHA-256) of your chosen passcode is stored on your device. The passcode itself is never stored in plain text and is never transmitted anywhere.

2.2 Information collected automatically

Purchase and subscription status, provided to us by Google Play Billing when you subscribe (see Section 8).
Push notification token, issued by Firebase Cloud Messaging to enable delivery of app notifications (see Section 9).
Basic technical data such as app version, device operating system version, and crash/error diagnostics, which may be collected via Firebase to help us maintain app stability.

What we do NOT collect

Astrun does not collect your precise/GPS location, does not access your contacts, does not track your browsing activity outside the app, and does not sell your personal data to third parties or use it for third-party advertising. Astrun displays no ads.

3. How We Use Your Information

We use the information described above to:

Provide the app's core functionality: moon-phase calendars, frost-risk forecasting, plant and journal tracking, and reminders.
Calculate location-specific frost forecasts for the city you provide.
Process and manage your subscription through Google Play Billing.
Send you notifications you have opted into (frost alerts, moon-phase changes, to-do and journal reminders).
Back up and restore your garden data if you enable the optional Google Drive backup feature.
Diagnose and fix technical issues, and improve the app's reliability.

4. Location Data — City-Based, Not GPS

Astrun's frost-alert feature requires a location to fetch a relevant weather forecast. Astrun asks you to type in a city name, which is converted into approximate geographic coordinates using a third-party geocoding service (Open-Meteo, see Section 6) purely to retrieve a weather forecast for that place.

Astrun does not request access to your device's GPS or fine/precise location at any point. The location associated with your account is only as precise as the city you choose to enter, and you may change or remove it at any time in Location Settings.

5. Google Drive Backup

Astrun offers an optional, off-by-default backup feature that, once enabled, securely stores a backup of your garden data (plants, journal entries, to-dos, photos, and relevant app settings) in your own Google Drive account.

Backups are stored using Google Drive's application-data folder, a special storage space that is not visible in your regular Google Drive interface and is accessible only by the Astrun app — not by you browsing Drive directly, and not by any other application.
Astrun requests only the minimal Google Drive permission needed for this feature (the drive.appdata scope) — it does not request access to your other Drive files or folders.
When enabled, Astrun performs an automatic backup approximately once per day if your data has changed, and you may also manually back up or restore your data at any time from Account Settings.
You may disable this feature at any time; disabling it stops future automatic backups but does not automatically delete a backup already stored in your Drive's app-data space. You can remove a stored backup by choosing "Start fresh backup" in the app, or by revoking Astrun's Drive access from your Google Account permissions page.

6. Third-Party Services

Astrun relies on the following third-party services to operate. Each processes only the minimum data necessary for its function, and each maintains its own privacy practices:

Service	Purpose	Data involved
Open-Meteo	Weather forecasting and city geocoding for frost alerts	City name you enter, converted to approximate coordinates; no account or personal identifier is sent
Google Play Billing	Subscription purchase and management	Purchase status, subscription state, transaction identifiers (handled by Google)
Google Drive API	Optional data backup, described in Section 5	Your garden data, only if backup is enabled
Firebase Cloud Messaging	Delivering push notifications	A device notification token

We encourage you to review Google's Privacy Policy at policies.google.com/privacy for details on how Google Play Billing, Google Drive, and Firebase handle data.

7. Data Storage & Security

By default, your garden data is stored locally on your device in a private, app-only database, and is never transmitted to Astrun's developers or any server we operate — Astrun does not currently operate its own backend server for garden data. Data only leaves your device if you enable Google Drive backup (Section 5), in which case it is transmitted directly and securely to your own Google Drive account.

If you set an app passcode, it is stored only as an irreversible cryptographic hash, on your device, never in plain text and never transmitted.

While we take reasonable measures to protect your information, no method of electronic storage or transmission is 100% secure, and we cannot guarantee absolute security.

8. Subscription & Payment Data

Astrun requires an active subscription to use the app's full functionality, offered through Google Play Billing, which may include a free trial period as described at the time of purchase. Astrun does not directly collect or store your payment card details — all payment processing is handled by Google Play, subject to Google's own privacy and payment terms. Astrun only receives confirmation of your subscription status (active, trial, expired, or cancelled) in order to grant or restrict access to app features accordingly.

9. Push Notifications

If you grant notification permission, Astrun may send you notifications about frost risk, moon-phase changes, and to-do or journal reminders, based on preferences you control in Notification Settings. You may disable any or all notification categories at any time within the app, or disable notifications entirely through your device's system settings.

10. Data Retention & Deletion

Local data: your garden data remains on your device until you delete it — individually (deleting a specific plant, entry, or to-do), in bulk (using the "Clear app data" option in Account Settings), or by uninstalling the app.
Google Drive backup: a stored backup persists in your Drive's app-data space until you replace it with a fresh backup, disable the feature and manually remove it, or revoke Astrun's Drive access via your Google Account settings.
Subscription records: retained by Google Play in accordance with Google's own data retention practices.

11. Children's Privacy

Astrun is not directed at children under the age of 13 (or the relevant minimum age in your jurisdiction), and we do not knowingly collect personal information from children. If you believe a child has provided us with personal information, please contact us using the details in Section 15 so we can take appropriate action.

12. Your Rights

Depending on your location, you may have rights under applicable data protection law (such as the EU/EEA General Data Protection Regulation) including the right to:

Access the personal information associated with your use of Astrun.
Correct inaccurate information (most garden and profile data can be edited directly within the app).
Delete your information (via in-app deletion tools, or by contacting us).
Export a copy of your data (Astrun's built-in "Data Export" feature lets you generate a local export of your profile settings at any time).
Withdraw consent for optional features such as Google Drive backup or notifications, at any time.

To exercise any of these rights beyond what is available directly in the app, please contact us using the details in Section 15.

13. International Users

Astrun is developed by Zeinen Technology, based in Hungary (European Union). If you use Astrun from outside Hungary or the EU/EEA, your information may be processed in Hungary or in the jurisdictions where our third-party service providers (Section 6) operate, which may have different data protection laws than your own country.

Privacy Policy