Last updated: July 29, 2026
HydroSizer works 100% offline. It does not have a backend, does not require an account, and does not include any analytics or tracking software. This page explains exactly what that means for your data.
None. HydroSizer does not collect, transmit, or share any personal information, usage data, device identifiers, or location data. The app never requests network/internet permission, because it never needs one.
Your preferences — flow, head-loss, head, diameter and temperature units, fitting and head-loss calculation methods, default pipe material, language, and numeric keypad setting — are saved locally on your device using the operating system's standard local storage. This data:
HydroSizer does not integrate any third-party SDKs, analytics platforms, advertising networks, or crash-reporting services.
HydroSizer is sold as a one-time purchase through the Apple App Store or Google Play Store. Payment processing is handled entirely by Apple/Google under their own privacy policies — the developer never sees or stores your payment information.
HydroSizer is a hydronic engineering tool and is not directed at children. Since the app collects no data from any user, this applies equally regardless of age.
If this policy ever changes — for example, if a future version adds an optional feature that touches data — this page will be updated and the "last updated" date above will change accordingly.
Questions about this policy can be sent to duongnh@axalize.vn.