Privacy Policy, Construction Calculator

1. Who we are

Construction Calculator (“the app”, “we”, “us”) is published by manextapps. This policy explains how the Android app handles information. If you have a question, see Contact.

2. About the app

Construction Calculator is a feet, inch and fraction calculator with a saved tape history. Pro adds tools for stairs, rafters and roof pitch, right triangles, concrete, block and brick, drywall, paint, flooring and board feet, plus saved jobs that you can share as a PDF and back up to a file.

All the math runs on your phone, and the app works offline. It goes online only to load the banner ad and the consent form, to talk to Google Play about the purchase, and when you open a link such as this policy. Keep in mind it's a calculator. It doesn't approve plans or replace your local building code.

3. Data we collect

We, the developer, don't run a server for this app and don't collect, receive or store personal data about you. There's no account or sign in, no analytics or crash reporting tool of our own, and no Firebase.

The banner ad comes from Google, which collects some data directly through its software development kit (SDK). That's explained in section 5. The optional purchase is processed by Google Play, see section 8.

If you email us, we'll receive your email address and whatever you choose to write. We use it only to reply, and we keep it only as long as that takes.

4. Data stored on your phone

So it can work, the app saves the following on your phone. None of it is sent to us.

• The calculator: what you last typed and your tape history (each calculation, its answer, the time, and any name you gave it).
• Your jobs: job names and the tape lines and tool results you saved into them.
• The last values you typed into each tool, so they're still there next time.
• Settings: precision, result unit, haptics, theme, whether Pro was bought, and a count of how often the app was opened.

Google's ad, consent and billing libraries also keep some information on your phone, such as your consent choices, so they work correctly.

5. Advertising and Google's ad SDK

Ads come from the Google Mobile Ads SDK (Google AdMob), and Google's User Messaging Platform (UMP) asks for ad consent where that's required.

There's only one ad: a small banner at the bottom of the Tools list, shown in the free version. You won't see ads on the calculator, inside a tool, on your results, on your jobs or on the purchase screen. There are no full screen ads and no video ads. Buying Pro removes the banner.

What Google's ad SDK collects

According to Google's data disclosure for the Google Mobile Ads SDK, the SDK automatically collects and shares the following data:

Your measurements, tape and jobs are never passed to the ad SDK. Google states that the data above is used for advertising, analytics and fraud prevention, and that it's encrypted in transit. Google may also use information from apps that use its services as described in How Google uses information from sites or apps that use our services and in the Google Privacy Policy. Google's handling of this data is governed by Google's own policies, not by us.

Personalized and non personalized ads

Personalized ads are based on things like your interests and past activity. Non personalized ads use more limited context, such as the app itself and your general (not precise) location. Depending on your choices, your region and your device settings, Google may show you personalized, non personalized or limited ads. Learn more in How Google uses cookies and similar technologies in advertising.

6. Consent and your ad choices

Where it's required (for example in the European Economic Area, the United Kingdom and Switzerland, and, where enabled, some U.S. states), the app shows Google's consent message when it starts. You can accept, decline or manage your choices.

When privacy options apply in your region, you can review or change your choices at any time under Settings, About, Privacy choices. If your choices mean no ad can be requested, the app still works fully.

You can also manage ad personalization for your Google Account at My Ad Center.

7. Your advertising ID

Android gives each device a resettable advertising ID. On most phones you can reset or delete it in Settings, Privacy, Ads (menu names vary by device and Android version). Deleting it stops apps from using it for advertising, and resetting it swaps it for a new random ID. Some phones also offer Privacy Sandbox ad settings in the same place.

8. In app purchase

Pro is a one time purchase that adds the nine tools, saved jobs, PDF sharing and backups, and removes the banner. It's made through Google Play Billing: Google handles the payment and your payment details, and we never see them. All we get back is a confirmation from Google Play that Pro belongs to your Google account, so the app can turn Pro on and restore it on another phone with the same account.

9. Android permissions

The app doesn't ask for location, camera, contacts, microphone, notifications or storage access. Backup files are saved and opened through Android's own file picker, which gives the app access only to the one file you pick. The installed app includes these permissions:

• Internet access and network state: to load the banner, the consent form and the purchase screen.
• Advertising ID (com.google.android.gms.permission.AD_ID): lets the ad SDK read the advertising ID.
• Android ad services (ACCESS_ADSERVICES_AD_ID, ACCESS_ADSERVICES_ATTRIBUTION, ACCESS_ADSERVICES_TOPICS): let the ad SDK use Android's Privacy Sandbox ad features where the phone supports them.
• Google Play billing (com.android.vending.BILLING): lets the app offer the Pro purchase.
• Wake lock and foreground service: added by Android libraries that the ad SDK uses for short background tasks. Our own code doesn't run a foreground service.

10. Children

Construction Calculator is a tool for building work and isn't directed at children. We don't knowingly collect personal information from children, and the app itself doesn't collect personal information from anyone. The banner is served by Google, which collects the data described in section 5. If you're a parent or guardian and have a concern, please contact us.

11. Data retention and deletion

• Our servers: we have none, so we keep no copy of your data.
• On your phone: your tape and jobs stay until you clear them in the app (Clear tape, Remove from job), clear the app's data in Android settings, or uninstall the app.
• Files you shared or saved: PDFs and backup files stay wherever you sent or saved them until you delete them there.
• Google: data collected by Google's ad SDK and by Google Play is kept according to Google's policies. See the Google Privacy Policy and How Google retains data.

12. PDFs, backups and new phones

Share PDF: a job's PDF is made on your phone and handed to Android's share menu. You choose the app or person it goes to. We never receive it.

Backup file: in Settings, Jobs backup you can save one file with your jobs and tape, and import it later, for example on a new phone. It's created only when you ask, and it's saved to the place you pick in Android's file picker (your phone, a memory card or a cloud drive you use). It's a plain text file, so anyone with the file can read your jobs. Keep it somewhere you trust.

Android backup: if backup to your Google Account is turned on in your phone's settings, Android may include the app's data (tape, jobs and settings) in that backup, and a phone to phone transfer may copy it to your new phone. That backup is run by Google under your Google Account, not by us.

13. Sharing and links

We don't sell or share your personal data, because we don't receive any. Apart from Google's libraries described above, information leaves the app only when you choose to:

• Open a link, such as this privacy policy. This policy is hosted on GitHub Pages, and GitHub may log visitors' IP addresses for security under the GitHub General Privacy Statement. This page uses no cookies, analytics or tracking scripts.
• Contact us: the app opens your email app with our address filled in. You decide what to send.
• Share a PDF or save a backup file, as described in section 12.

14. Security

Since we don't collect your data, there's no copy of it on our side to protect or lose. Data on your phone is protected by Android's app sandbox. Google states that the data its ad SDK collects is encrypted in transit. No way of storing or sending data is completely secure, so we can't promise absolute security.

15. Your rights

Depending on where you live, privacy laws such as the EU and UK General Data Protection Regulation (GDPR), Canada's PIPEDA, Israel's Protection of Privacy Law, 5741 (1981), and U.S. state privacy laws may give you rights over your personal data. These can include the right to access, correct or delete it, to object to or restrict some processing, to withdraw consent, and to complain to a data protection authority.

• We don't hold personal data about you, so in most cases there's nothing for us to access or delete. Your data is on your phone and you can delete it as described in section 11.
• For data collected by Google, use your ad choices in the app (section 6), your phone's ad settings (section 7), and Google's own tools described in the Google Privacy Policy.
• You can always contact us, and we'll help as far as we can.

16. Changes to this policy

We may update this policy, for example if the app or the services it uses change. We'll post the new version on this page and change the effective date at the top. If a change is significant, we'll also mention it in the app's release notes.

17. Contact