App Privacy Policy

Last updated: 12/7/2025

1. Controller

Responsible for data processing in our mobile applications is:

Martin Appelmann
Sophienstraße 40
38118 Braunschweig
Germany

Email: hello@martin-appelmann.de
Phone: +49 151 701 614 39

2. General Information on Data Processing

This privacy policy applies to all mobile applications (apps) developed and operated by Martin Appelmann. We take the protection of your personal data very seriously and treat your personal data confidentially and in accordance with statutory data protection regulations and this privacy policy.

3. Collected Data and Purpose of Processing

3.1 OneSignal (Push Notifications)

Our apps use OneSignal for sending push notifications. The following data is processed:

Device ID and push token
Operating system and device type
App version
Timestamp of last use
Language and timezone settings
IP address (temporary)

Purpose: Sending push notifications about important updates, messages or events in the app.

Legal basis: Consent according to Art. 6 para. 1 lit. a GDPR. You can deactivate push notifications at any time in the device settings.

Service provider: OneSignal, Inc., 2850 S Delaware St Suite 201, San Mateo, CA 94403, USA

More information: OneSignal Privacy Policy

3.2 Matomo (Analytics)

To improve our app services, we use Matomo, a privacy-friendly analytics software. The following data is collected:

Anonymized IP address (last 2 bytes are removed)
Date and time of use
Accessed screens and functions
Device type and operating system
App version
Approximate location (country/region based on IP)
Interactions within the app

Purpose: Analysis of user behavior to improve app functionality and user experience.

Legal basis: Consent according to Art. 6 para. 1 lit. a GDPR or legitimate interest according to Art. 6 para. 1 lit. f GDPR to improve our service.

Anonymization: IP addresses are anonymized before processing. No user fingerprinting is used. Data is stored on our own servers in Germany.

Right to object: You can object to the analysis in the app settings.

3.3 Sentry (Error Tracking)

To detect and fix technical errors, we use Sentry. The following data is collected:

Error messages and stack traces
Device type, operating system and app version
Anonymized IP address
Timestamp of error
App state at time of error
Breadcrumbs (actions before error)

Purpose: Identification and fixing of technical problems and app crashes to improve app stability.

Legal basis: Legitimate interest according to Art. 6 para. 1 lit. f GDPR to ensure technical functionality of our app.

Service provider: Functional Software, Inc. dba Sentry, 132 Hawthorne Street, San Francisco, CA 94107, USA

Privacy: Personal data (e.g. username, email) is removed before transmission. Only technical error information is collected.

More information: Sentry Privacy Policy

4. Permissions

Our app may request various device permissions:

Internet access: For communication with our servers and services
Push notifications: To receive notifications (optional)
Storage: For caching data and media (depending on app)
Camera/Photos: Only if app functionality requires it (optional)

All permissions are requested only when needed and can be revoked at any time in device settings.

5. Data Sharing

Your data is only shared with third parties to the following extent:

To the mentioned service providers (OneSignal, Sentry) to fulfill the described purposes
If legal obligations require it
With your explicit consent

We do not sell your data to third parties and do not share it for advertising purposes.

6. Data Transfer to Third Countries

Some of our service providers (OneSignal, Sentry) are based in the USA. Data transfer is based on:

Standard contractual clauses of the EU Commission
Adequacy decisions (EU-US Data Privacy Framework)
Your explicit consent

7. Storage Duration

We store your data only as long as necessary for the respective purposes:

OneSignal: Until you deactivate push notifications or uninstall the app
Matomo: Analytics data is anonymized or deleted after 12 months
Sentry: Error reports are automatically deleted after 90 days

8. Your Rights

You have the following rights regarding your personal data:

Information (Art. 15 GDPR): Information about stored data
Correction (Art. 16 GDPR): Correction of incorrect data
Deletion (Art. 17 GDPR): Deletion of your data ("right to be forgotten")
Restriction (Art. 18 GDPR): Restriction of processing
Data portability (Art. 20 GDPR): Receipt of your data in structured format
Objection (Art. 21 GDPR): Objection to processing
Revocation (Art. 7 para. 3 GDPR): Revocation of given consents

To exercise your rights, please contact us at: hello@martin-appelmann.de

9. Right to Object

You have the right to object to the processing of your data at any time. You can do this by:

Deactivating the analysis function in the app settings
Deactivating push notifications in device settings
Email to hello@martin-appelmann.de

10. Data Security

We implement technical and organizational security measures to protect your data:

Encrypted data transmission (TLS/SSL)
Regular security updates
Access restrictions and authentication
Regular security reviews

11. Minors

Our apps are not specifically targeted at persons under 16 years of age. We do not knowingly collect personal data from minors. If you find that we have inadvertently collected data from minors, please contact us immediately.

12. Changes to Privacy Policy

We reserve the right to adapt this privacy policy to changed legal situation or changes to our services. In case of significant changes, you will be informed within the app.

13. Right to Complain

You have the right to complain to a data protection supervisory authority:

The State Commissioner for Data Protection Lower Saxony
Prinzenstraße 5
30159 Hannover
Germany
www.lfd.niedersachsen.de

14. Contact

For questions about data protection or to exercise your rights, contact us: