Privacy Policy for BuildQuanty

App: BuildQuanty: Construction Package name: com.mobilecastle.buildquanty Publisher: MobileCastle (Mobile Castle) Effective date: 27 October 2026

This Privacy Policy explains what information the BuildQuanty app (“BuildQuanty”, “the app”, “we”, “us”) does and does not handle, and how. Please read it together with the policies of the third parties named below.

By using BuildQuanty you agree to the practices described here.

Summary (plain language)

• BuildQuanty has no user accounts and no sign-up. We do not ask for your name, email, phone number, or any similar personal detail.
• Your calculations, projects and prices stay on your device. Every calculation runs on your phone or tablet, and your projects, estimates, prices, presets and history are stored only there; an estimate leaves your device only when you save or share it. MobileCastle does not operate any server that receives them.
• No camera, microphone or location. BuildQuanty works only from the values you type, and asks for no camera, microphone, location, contacts or storage permission.
• BuildQuanty shows ads through Google AdMob, a third party. To serve ads, AdMob may collect device information and an advertising identifier. Ads never receive your dimensions, projects or prices.
• No purchases in this version. BuildQuanty offers nothing to buy: it does not connect to Google Play Billing, and it does not ask for the billing permission. Premium features are coming soon.

The rest of this policy gives the detail behind that summary.

Information BuildQuanty itself collects

BuildQuanty does not collect personal data on its own servers, because MobileCastle does not run a server that receives your data. Specifically:

• No account / identity data. There is no login, so we do not collect a name, email address, password, phone number, or profile.
• No upload of your work. Dimensions, results, projects, client names, notes, prices and estimates are not copied to us.
• No analytics SDK operated by us. BuildQuanty does not embed our own analytics, crash-reporting or tracking service. (Google AdMob and the other Google services described below are independent third parties with their own data handling.)

Data that stays on your device

Some information is stored locally on your phone so the app can work and remember your settings. This data is not transmitted to MobileCastle. It includes:

• Projects: the project name and any client name and notes you type, its areas, the calculations you add (the values you entered and the units), the prices for their materials, your own cost lines, and the labour, contingency and tax settings. They are saved in a database in the app’s own private storage.
• Calculator history and presets: results you keep in History, presets you save, and the last values you typed in each calculator, so it opens where you left it.
• Prices: the material prices you type are remembered for next time.
• Your preferences: for example theme, language, units, currency symbol, favourite and recently used calculators.
• Estimates you export: a PDF or CSV estimate is written to a place you choose with Android’s own save screen, or to the app’s private cache so you can share it; only the most recently shared file is kept there.
• A local diagnostic log: BuildQuanty writes a technical log (app events and errors) to a file in the app’s own folder on your device, to help troubleshoot problems on real hardware. It never contains your dimensions, quantities, prices, project or item names, and it stays on your device unless you deliberately share it.

All of it is removed when you uninstall BuildQuanty. Settings → Clear history removes your calculator history, and Clear all local data also projects, presets, prices and settings. See Data retention and deletion below.

Advertising (Google AdMob)

BuildQuanty is free and supported by ads served through Google AdMob, a Google service. Ads appear as banners on the calculator list, history, the project list and the final estimate, never in a calculator, in project editing or next to an export button. There are no full-screen ads when you open the app or move between screens.

The ad requests BuildQuanty sends carry no content from the app: no dimension, quantity, price, project or estimate is ever passed to AdMob. To select and show ads, Google AdMob (and the Google Mobile Ads SDK included in the app) may collect and process information such as:

• a device advertising identifier (Android Advertising ID),
• device and network information (for example device type, operating-system version, general/coarse location inferred from your IP address, and similar technical data),
• ad-interaction and app-usage data related to the ads shown,
• crash and diagnostic information about the ads software itself.

Google uses this information to serve and measure ads and to help prevent fraud and abuse, in accordance with Google’s own policies. Where required by law (for example, for users in the European Economic Area, the UK and Switzerland), BuildQuanty uses Google’s User Messaging Platform to show a consent form before serving personalised ads, and no ad is requested until that choice is made; you can change your choice at any time in Settings → Privacy options. You may also choose to watch a short rewarded ad to export one estimate, or to use one advanced calculator until you close the app; this is optional.

• Google Privacy Policy: https://policies.google.com/privacy
• How Google uses information from sites or apps that use its services: https://policies.google.com/technologies/partner-sites
• AdMob / Google Ads policies: https://support.google.com/admob/answer/6128543

You can limit ad personalisation and reset your advertising ID in your device settings (Settings → Google → Ads on most Android phones).

Purchases

This version of BuildQuanty offers no in-app purchases. It does not connect to Google Play Billing, it asks for no billing permission, and no part of the app can start a payment. Some calculators and features are marked for a future Premium version; they show “Premium features are coming soon.” If purchases are added in a later version, this policy will be updated before that version is released.

App permissions and why they are needed

BuildQuanty requests the following Android permissions. Each is used only for the feature described:

• Internet (INTERNET): to load ads. Your calculations and projects are not sent.
• Network state (ACCESS_NETWORK_STATE): to check whether you are online before offering a rewarded ad.
• Added by the Google libraries: the advertising ID and Android’s privacy-preserving ad APIs (AD_ID, ACCESS_ADSERVICES_AD_ID, ACCESS_ADSERVICES_ATTRIBUTION, ACCESS_ADSERVICES_TOPICS) for ads; and background-work permissions (WAKE_LOCK, RECEIVE_BOOT_COMPLETED, FOREGROUND_SERVICE) that the ads library uses for its own short tasks.

BuildQuanty asks for no camera, microphone, location, storage, contacts, phone or SMS permission.

Third-party services

BuildQuanty relies on the following third parties. Their handling of information is governed by their own privacy policies:

When you share an estimate, Android’s share sheet sends it to the app you choose (for example email or a spreadsheet app). What that app does with it is governed by its own privacy policy.

Children

BuildQuanty is a general-audience utility and is not directed at children. We do not knowingly collect personal information from children. The app is intended for general audiences and, in line with the store listing, is not aimed at or designed to appeal to children.

Because the app shows ads, it follows Google Play’s Families and ads policies for a general-audience app. If you believe a child has used the app in a way that raises a concern, please contact us using the details below.

Data retention and deletion

Data stored locally by BuildQuanty (projects, notes, history, presets, prices, preferences, exports and the diagnostic log) stays on your device and is retained until you remove it. BuildQuanty never deletes your projects on its own: on the free tier, projects beyond the first three are locked, not deleted.

You can delete this data at any time by:

• uninstalling the app, which removes all of its local storage, or
• using Settings → Clear history (calculator history) or Clear all local data (also projects, presets, prices and settings), or deleting a single project, area, item or history entry from its own screen.

MobileCastle does not hold a copy of this data, so there is no separate server-side deletion request to make to us.

For data processed by the third parties above (for example Google’s advertising data), please use the controls those parties provide (see their policies linked above) and your device’s Ads settings.

Security

Because BuildQuanty keeps your data on your own device and does not run a MobileCastle server, your projects and prices are not exposed on our infrastructure. Estimates leave your device only when you save or share them.

No method of electronic storage or transmission is 100% secure; while we aim to protect your information, we cannot guarantee absolute security.

Changes to this policy

We may update this Privacy Policy from time to time, for example if the app adds a feature that changes how information is handled. When we do, we will update the Effective date above and post the revised policy at the URL where this policy is hosted. Significant changes may also be noted in the app or its store listing.

Contact

If you have questions about this Privacy Policy or BuildQuanty’s data practices, you can contact us at:

• Email: mobilecastle.android@gmail.com
• Publisher: MobileCastle (Mobile Castle)