For the mobile app "Zugkraft". Last updated: July 2026.
Lukas Mauracher, Bürgerstraße 22/11, 4300 St. Valentin, Austria.
Email: [email protected] · Phone: +43 670 7039535.
The following data is stored exclusively locally on your device (app storage) and is neither collected nor transmitted by us:
This data is completely removed when you uninstall the app or use the "Delete all data" function within the app.
If you use an AI feature – AI Coach, AI Custom Plan, or Plan Import (photo/PDF) – the data required for that feature is transmitted to our server (Cloudflare) and from there to the AI service Anthropic PBC (USA) for processing. Depending on the feature, this may include:
Progress photos are never transmitted. Our server does not permanently store these requests – they are only passed through to generate a response. Anthropic does not use the content to train AI models, in accordance with its terms of service.
Legal basis: Art. 6 (1)(b) GDPR (fulfillment of the function you explicitly requested). No transmission occurs unless you use these features.
If you send us feedback through the app, your free text as well as technical information (app version, operating system, and an anonymous support ID) are transmitted to our server and delivered to us as a message via Telegram. The support ID is a random string and is not linked to your identity. Legal basis: Art. 6 (1)(f) GDPR (processing your feedback).
If you enable the Health integration, Zugkraft reads weight, steps, heart rate variability, resting heart rate, and sleep from Apple Health, and writes your logged weight and completed workouts back to it. This processing takes place exclusively locally on your device via Apple's HealthKit. No health data is transmitted to us or to third parties.
Purchases and subscriptions are handled through the Apple App Store; Apple is your contractual partner for payment. To manage purchase status, we use the service RevenueCat, Inc. (USA). An anonymous, randomly generated app user ID is processed together with your purchase status – without your name, email, or payment details. We never see payment data; it is processed solely by Apple. Legal basis: Art. 6 (1)(b) GDPR.
Zugkraft contains no advertising, no advertising IDs, no analytics or tracking SDKs, and sets no cookies. No cross-device tracking takes place.
For transfers to the USA we rely on the European Commission's Standard Contractual Clauses (Art. 46 GDPR) and/or the EU-US Data Privacy Framework, where the respective provider is certified.
Local data stays on your device until you delete it. Server requests (AI, feedback) are not permanently stored. Feedback messages remain in Telegram until deleted.
You have the right to access, rectification, erasure, restriction of processing, data portability, and objection (Art. 15–21 GDPR). Since most data is stored exclusively locally, you can view and delete it yourself in the app at any time. For server-related inquiries, contact us at [email protected].
Right to lodge a complaint with the supervisory authority: Austrian Data Protection Authority (Österreichische Datenschutzbehörde), Barichgasse 40–42, 1030 Vienna, Austria, www.dsb.gv.at.