ConcreteCalc — Privacy Policy
Last updated: July 21, 2026
This Privacy Policy describes how ConcreteCalc (the "App") handles your information. The App is a concrete-estimating calculator published by AxelStack (the "Developer"). Your privacy matters, and the App is designed to need none of your personal data.
The short version
ConcreteCalc does not collect, store, transmit, or share any personal information. All calculations happen on your device and work fully offline. There are no accounts, no ads, and no third-party trackers. The App reports a small amount of anonymous usage statistics (for example, which calculators are opened) to an analytics server operated by the Developer, and nothing else.
Information we collect
Anonymous usage statistics only. To understand which features are useful, the App sends the Developer's own self-hosted analytics server (Matomo) the following: which screens and calculators are opened, the app version, device platform and OS version, screen size, and language. These are keyed by a random identifier that is not derived from you or your device and cannot be linked to your identity.
The numbers you type never leave your device. Dimensions, prices, and results are not transmitted. The App does not collect any personal information and does not request access to your location, contacts, camera, photos, microphone, or files.
Information stored on your device
Your preferences — such as units (US/metric), theme, currency, default waste factor, truck capacity, and last-used prices — are saved locally on your device only so the App remembers your settings between sessions. This information never leaves your device and is not accessible to the Developer or anyone else. Removing the App deletes it.
Third-party services
The App does not integrate any third-party analytics, advertising, or data-collection SDKs. Usage statistics are collected with self-hosted Matomo running on infrastructure controlled by the Developer and are never shared with, or accessible to, any third party. The App does not require an internet connection to function; statistics are simply sent later when a connection is available.
Children's privacy
The App does not collect personal information from anyone, including children under the age of 13. It is a general-purpose tool suitable for all ages.
Purchases
ConcreteCalc is a paid app distributed through the Google Play Store. Any payment is processed by Google under its own terms and privacy policy; the Developer does not receive or store your payment details.
Changes to this policy
This policy may be updated from time to time. Material changes will be reflected by updating the "Last updated" date above.
Contact
This app is published by AxelStack (axelstack.com). If you have questions about this Privacy Policy, contact us at alex@axelstack.com.