Target audience 13+. Free with ads (AdMob) + optional one-time IAP (Pro). No account, no personal data. Unit preference and calculation history stored on-device only (shared_preferences). UMP consent before ads.
- Collect/share? Yes — Google Mobile Ads (advertising ID, app activity, diagnostics; consent-gated) + Play Billing (purchase history). Encrypted in transit: Yes. Deletion: support@z-ax.com / reset ad ID / Privacy Options. - NOT collected: name, email, location, contacts, photos, camera, health, microphone. Measurements and calculations never leave the device.
No violence/sex/language/gambling/substances (a construction material estimator) · no user-to-user comms · no location share · digital purchases: Yes · ads: Yes.
Age 13+ (no under-13). Utility imagery only (rulers, building materials).
INTERNET, ACCESS_NETWORK_STATE (ads), BILLING (IAP), VIBRATE (haptic feedback). No storage/location/camera/mic permissions.
- AdMob TEST ids in dev (`useTestAds`); production app id + real units swapped before release (tools/factory/inject_ids.py). Banner in the bottomNavigationBar slot on home/calculator/history + occasional interstitial after a completed calculation + App-Open on resume. UMP consent gate (EEA/UK/CH). - IAP: `pro_unlock` (non-consumable) — all 8 calculators, calculation history, no ads. `remove_ads` (non-consumable) — ads only. Prices set in Play Console (EUR).
All outputs are indicative estimates with a separate +10% safety margin; the app shows "always check quantities with your supplier" on every screen.