As of: October 2026
1. Controller
SynthScript Inh. Christoph Kretschmer
Hornisgrindestraße 9, 77855 Achern, Germany
Email: info@synthscript.de · Privacy: privacy@synthscript.de
2. General
We process your data exclusively in accordance with the GDPR. This policy informs you about the nature, scope and purpose of data processing when using the "Copper Trails" app (in the App Store and on Google Play: "Copper Trails: Circuit Puzzle", app ID de.synthscript.coppertrails) for iOS and Android.
3. No Account, No Server of Our Own
Copper Trails can be used without registration and without an account. SynthScript does not operate a server for the app; we receive no personal data through the app. Data is only transmitted to the services named in sections 6 to 10. The app does not use any analytics services.
4. Local Storage on Your Device
Game progress, stars, best scores, your daily challenge streak, your settings (sound, vibration, animations, language) and your Pro status are stored exclusively on your device (iOS: UserDefaults, Android: SharedPreferences). This data is not transmitted to us. It is deleted when you uninstall the app.
The daily challenge is calculated within the app from the current date; no network access is required for it.
5. Permissions
The app does not request permissions for location, camera, microphone, contacts or photos. Sound and vibration do not require any separate permission.
6. Advertising (Google AdMob)
The free version of Copper Trails shows ads (full-screen ads between game sections and optional rewarded videos). For this we use Google AdMob, a service of Google Ireland Limited, Gordon House, Barrow Street, Dublin 4, Ireland ("Google"). Google processes the data for AdMob as an independent controller (Google Ads Controller-Controller Data Protection Terms, business.safety.google/adscontrollerterms).
In particular, the following data is processed:
- The device's advertising ID (IDFA on iOS, advertising ID/AAID on Android)
- IP address
- Device and app information (e.g. device type, OS version, language, app version)
- Interactions with ads (e.g. impressions, clicks, rewarded videos watched)
Consent: On first launch, the app asks for your consent via Google's consent platform (User Messaging Platform, IAB TCF v2.2). On iOS, the App Tracking Transparency (ATT) prompt is shown in addition. Which ads you see depends on your choice:
- Personalised ads only if you have consented to storing and accessing information on your device and to ad personalisation.
- Non-personalised ads if you have consented to storing and accessing information on your device, but not to personalisation. These ads are based only on context (e.g. the app), not on your behaviour.
- Limited ads if you have not consented. No device identifiers such as the advertising ID are used and no ads are personalised. Google still processes data such as the IP address to transmit the ad to your device and to defend against fraud and abuse.
You can change or withdraw your consent at any time in the app under Settings → Privacy settings.
Legal basis: For personalised and non-personalised ads, your consent (Art. 6(1)(a) GDPR), and for storing and accessing information on your device additionally Section 25(1) TDDDG. For limited ads without consent, our legitimate interest in financing the free app through advertising (Art. 6(1)(f) GDPR); in this case, no information on your device is accessed for advertising purposes. You can object to processing based on legitimate interest under Art. 21 GDPR; you can avoid ads entirely by purchasing "Pro".
Transfers to third countries: Google may transfer data to the USA. This is based on the adequacy decision for the EU-US Data Privacy Framework (Art. 45 GDPR) and, additionally, Standard Contractual Clauses (Art. 46 GDPR).
More information: policies.google.com/technologies/partner-sites and policies.google.com/privacy
After purchasing "Pro" (section 8), the app no longer shows ads.
7. Advertising ID and Tracking in Device Settings
Independently of the app, you can control the use of your advertising ID in your device settings:
- iOS: Settings → Privacy & Security → Tracking. There you can deny tracking for Copper Trails (or for all apps); the app then does not receive an advertising ID.
- Android: Settings → Google → Ads (or Settings → Privacy → Ads). There you can reset or delete your advertising ID.
The exact names of the menu items may differ depending on your device and OS version.
8. In-App Purchase "Pro" (RevenueCat)
"Pro" is a one-time purchase (not a subscription) and is processed through the respective app store (Apple App Store or Google Play). Purchase status is managed via RevenueCat Inc. (San Francisco, USA). For this, a randomly generated, anonymous app user ID and the store's purchase receipts are processed. We receive no payment data. RevenueCat acts as our processor (Art. 28 GDPR). Transfers to the USA are based on the EU Standard Contractual Clauses (Art. 46(2)(c) GDPR), which form part of RevenueCat's data processing addendum.
Legal basis: Art. 6(1)(b) GDPR
More information: revenuecat.com/privacy
9. Leaderboards (Apple Game Center / Google Play Games)
If you are signed in to Apple Game Center or Google Play Games on your device, the app transmits your scores or times to Apple or Google. They are shown on the leaderboards with your player name from the respective service. If you are not signed in, no data is transmitted to these services.
These services are governed by the privacy policies of Apple (apple.com/legal/privacy) and Google (policies.google.com/privacy).
Legal basis: Art. 6(1)(b) GDPR
10. Crash Reports (Firebase Crashlytics)
To find errors and keep the app stable, we use Firebase Crashlytics, a service of Google Ireland Limited, Gordon House, Barrow Street, Dublin 4, Ireland. If the app crashes, a crash report is sent to Crashlytics. The same applies to caught errors, for example if levels or the game progress could not be loaded.
The following data is processed:
- Crash or error report including stack trace
- Device model, OS version and app version
- Time of the crash or error
- A random installation ID generated by Crashlytics
No game content, game progress, advertising ID or account data is transmitted.
Objection: You can turn off crash reporting at any time in the app under Settings → "Send crash reports" (on by default). The app does not send any reports until it has read this setting.
Legal basis: Art. 6(1)(f) GDPR (legitimate interest in a stable, error-free app)
Transfers to third countries: Google may transfer data to the USA. This is based on the adequacy decision for the EU-US Data Privacy Framework (Art. 45 GDPR) and, additionally, Standard Contractual Clauses (Art. 46 GDPR).
More information: firebase.google.com/support/privacy
11. Retention
Locally stored data remains on the device until the app is uninstalled. For Google (AdMob), RevenueCat, Apple and Google (Game Center / Play Games), retention follows the respective provider's periods. Crash reports are retained by Firebase Crashlytics for 90 days.
12. Your Rights (GDPR)
- Access (Art. 15), Rectification (Art. 16), Erasure (Art. 17)
- Restriction (Art. 18), Portability (Art. 20), Objection (Art. 21)
As we do not store any personal data through the app ourselves, please also contact the respective provider directly regarding data held by Google, Apple or RevenueCat. We are happy to help.
Contact: privacy@synthscript.de
13. Withdrawal of Consent
You can withdraw any consent you have given at any time with effect for the future (Art. 7(3) GDPR), in the app under Settings → Privacy settings and, on iOS, additionally in the device's tracking settings (section 7). The lawfulness of processing carried out before the withdrawal remains unaffected.
14. Right to Lodge a Complaint
Supervisory authority: LfDI Baden-Württemberg
15. Data Security
We implement technical and organisational measures to protect your data. Communication with the services named above is encrypted.
16. Changes
We will update this privacy policy when the app or the legal situation changes. The version published on this page applies.