Early-access version, September 18, 2026
Controller. Maier Enterprises UG (haftungsbeschränkt), Panoramastr. 92, 71384 Weinstadt, Germany. Contact: hello@sumwerk.com.
This website. No analytics, no advertising trackers, no third-party fonts or scripts. The server keeps short-lived technical logs (IP address, time, requested page) to operate and secure the service. One cookie keeps you signed in.
Your account. Name, email address and a hashed password, used to sign you in and to contact you about the service.
Your Stripe data. When you connect Stripe, sumwerk reads billing data (customers, subscriptions, prices, coupons, invoices, events) through a restricted, read-only key and stores a copy to calculate your metrics. We process this data on your behalf and only for that purpose. The key is encrypted at rest. Disconnecting deletes the key; write to us to have the mirrored data deleted as well.
Hosting. Hetzner Online GmbH, data centre Nuremberg, Germany.
Your rights. Access, rectification, erasure, restriction, portability and objection under the GDPR, and the right to lodge a complaint with a supervisory authority. Write to the address above.