Data protection notes – Feldbuch

Controller

Christian Tonke
Adelheider Str. 258
27755 Delmenhorst
Germany
Email: christian@tonke.de

Applies to all modules

• No user account. Feldbuch does not require registration, an email address or signing in with me. I don't know who uses the app.
• Local only. All content lives in a local SQLite database inside your device's private app container; particularly sensitive fields are additionally encrypted with AES-256-GCM, with the key in the keychain (iOS Keychain or Android Keystore). Deleting the app removes this data.
• No server of mine. Feldbuch has no server of its own. The only network connection is purchasing and verifying the subscription via StoreKit 2 (Apple) or Google Play Billing (expo-iap) — Apple's/Google's own privacy terms apply there as well.
• Sharing only by you. Exports, backups and reports (PDF/ZIP/CSV) are only ever shared through the system share sheet, when you trigger it yourself.
• Subscription. Feldbuch is a subscription (€2.99/month, €24.99/year) with a free basic tier; purchase and management run entirely through Apple/Google — I never see any payment details.

1. Garden Plan & Sun

Local only – data leaves the device only if you share or back it up yourself

What is stored locally: Grid plan, plants, garden latitude/longitude (rounded to about 1 km), photos.

Permissions: Camera, photos, location (while in use), notifications.

2. Watering

Local only – data leaves the device only if you share or back it up yourself

What is stored locally: Watering schedules, log, rainfall amounts, holiday-cover person's name.

Permissions: Notifications.

3. Compost

Local only – data leaves the device only if you share or back it up yourself

What is stored locally: Composters, additions, turning dates.

Permissions: Notifications.

4. Seeds & Swapping

Local only – data leaves the device only if you share or back it up yourself

What is stored locally: Stock, germination tests, swap partners (name, free text), photos.

Permissions: Camera, photos, notifications.

5. Nature Watching

Local only – data leaves the device only if you share or back it up yourself

What is stored locally: Observations, photo, audio recording, precise location (optional, accuracy adjustable).

Permissions: Camera, photos, microphone, location.

6. Trails & Routes

Local only – data leaves the device only if you share or back it up yourself

What is stored locally: Tours, waypoints, emergency plan, trusted contact, packing list, received tour plans.

Permissions: Location, camera (QR scan).

7. Camping & Picnics

Local only – data leaves the device only if you share or back it up yourself

What is stored locally: Outings, meals, quantities per person, cooking equipment, checklists.

Permissions: –.

8. Bike & Gear

Local only – data leaves the device only if you share or back it up yourself

What is stored locally: Bike settings (bike dimensions, not body measurements), mileage, maintenance, gear with condition/weight/checks, photos.

Permissions: Camera, photos, notifications.

App stores

Feldbuch is distributed through the Apple App Store and Google Play. The terms of service and privacy policy of Apple or Google apply to the payment process and billing.

Legal basis

Local processing on your device: Art. 6(1)(b) GDPR (performance of the contract/use of the app) or legitimate interest (Art. 6(1)(f) GDPR). Any voluntary sharing (export, share sheet) happens at your own initiative.

Your rights

Since all content lives exclusively on your device, you can view, change, export or delete it yourself at any time (app settings or uninstalling). For questions about this processing, reach me at christian@tonke.de.