Privacy Policy

CalcHub – All-in-One Calculator · Last updated: October 18, 2026

Summary

• Your calculations never leave your device. We do not have servers that receive your numbers.
• We do not ask for an account, your name, email, location, contacts or photos.
• The free version of the CalcHub mobile app shows ads from Google AdMob. AdMob may collect device information as described below. You can turn off personalized ads, and you can remove ads entirely with a one-time purchase.
• The CalcHub website (erknerdn.github.io/calchub) shows no ads.

1. Calculations stay on your device

Every calculation runs locally on your phone, tablet or computer. The values you type are not sent to us or to any third party.

2. Data stored on your device

The app saves your theme choice, favorite calculators, whether you have seen the welcome screens and whether you purchased "Remove Ads" in your device's local storage. This data never leaves your device and is deleted when you uninstall the app.

3. Advertising (Google AdMob)

The free mobile app uses Google AdMob to show banner and occasional full-screen ads. To deliver, limit and measure ads, the Google Mobile Ads SDK may collect and process:

• Device identifiers such as the Android Advertising ID or Apple's IDFA (only if you allow tracking on iOS)
• IP address and approximate location derived from it
• Device and app information (model, operating system, app version, language)
• Ad interactions (impressions, taps) and diagnostic data

This data is collected by Google, not by us, and is handled under Google's Privacy Policy and How Google uses information from sites or apps that use its services.

Your choices:

• iPhone and iPad: the app asks for permission before your IDFA can be used for tracking. If you choose "Ask App Not to Track", you will still see ads, but they will not be personalized using that identifier. You can change this anytime in Settings › Privacy & Security › Tracking.
• Android: you can reset or delete your Advertising ID in Settings › Google › Ads (or Settings › Privacy › Ads).
• Consent and U.S. state privacy rights: where required by law (for example in the EEA, UK, Switzerland and certain U.S. states such as California), the app shows a consent or privacy-choices message from Google. When available, a "Privacy choices" link at the bottom of the app lets you change your choice or opt out of the "sale" or "sharing" of personal information for targeted advertising.
• Remove Ads: after the one-time purchase, the app no longer loads ads or the advertising SDK's ad requests.

4. In-app purchase

"Remove Ads" is sold through Google Play or the Apple App Store. Payment is processed entirely by Google or Apple; we never receive your payment details. The app only checks with the store whether the purchase exists so it can turn ads off and restore it on a new device.

5. Network requests

Besides ads, the Currency Converter requests public exchange rates from api.frankfurter.app (European Central Bank reference rates). The request contains no personal data. All other calculators work offline.

6. Children

CalcHub is a general-audience utility intended for adults and is not directed to children under 13. We do not knowingly collect personal information from children. Ads are limited to content rated suitable for general audiences with parental guidance.

7. Data sharing and sale

We do not sell, rent or share any personal information, because we do not collect any. Information collected by Google's advertising SDK is governed by Google's policies as described above.

8. Security and retention

Because your calculations are not transmitted or stored by us, there is nothing for us to retain or delete. Locally stored preferences are removed when you uninstall the app.

9. Changes

If this policy changes, the new version will be posted on this page with a new "Last updated" date.

10. Contact

Questions or requests about this policy: glrerdn25@gmail.com

Disclaimer: results are estimates for general information only and are not financial, tax, legal or medical advice.

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