Privacy Policy

This policy covers percentage.onl (the website), the Percentage Android app (com.freepercentage.calculator), and the Percentage iOS app (com.freepercentage.calculator). We do not collect personal data from calculator use on the website or in the apps. We do not run ads. We do not sell data.

Website (percentage.onl)

Calculations run in your browser. We do not have access to the numbers you type.

  • No personal data is collected through calculator inputs
  • No IP address logging for calculation activities
  • No third-party tracking cookies
  • Pages are served over HTTPS
  • Architecture is client-side for calculations — we do not receive your inputs on a server in order to compute results

Android app (Percentage)

The Android app is an offline calculator. It does not include an ads SDK, analytics SDK, crash reporter, or account system.

Permissions

The app requests Vibrate only, so practice can give a light haptic on right and wrong answers. You can turn haptics off in Settings.

The app does not request Internet, storage, location, contacts, camera, microphone, or advertising ID.

What stays on the phone

Settings and a little UI state are saved in Android DataStore on the device:

  • Language, decimal places, thousands separators, theme
  • Practice sounds and haptics
  • Last calculator tool and values, practice streak

What we do not do

That information is not uploaded. Uninstalling the app removes it. There is no account and nothing to delete on our servers.

  • No ads and no in-app purchases
  • No tracking, fingerprinting, or advertising identifiers
  • No sharing data with third parties (there is no user data to share)
  • Numbers you type are not sent to percentage.onl or to anyone else

iOS app (Percentage)

The iOS app (com.freepercentage.calculator) is an offline calculator. It does not include an ads SDK, analytics SDK, crash reporter, or account system. It does not use the network.

Permissions

The app uses haptics (the system Taptic Engine) so practice can give light feedback on right and wrong answers. You can turn haptics off in Settings.

The app does not use Tracking, Advertising Identifier, location, contacts, camera, microphone, or photo library.

What stays on the device

Settings and a little UI state are saved on the device with Apple’s UserDefaults:

  • Language, decimal places, thousands separators, theme
  • Practice sounds and haptics
  • Last calculator tool, practice streak, discount bag

What we do not do

That information is not uploaded. Uninstalling the app removes it. There is no account and nothing to delete on our servers.

  • No ads and no in-app purchases
  • No tracking, fingerprinting, or advertising identifiers
  • No sharing data with third parties (there is no user data to share)
  • Numbers you type are not sent to percentage.onl or to anyone else

Children

The website and the apps are general percentage tools. We do not knowingly collect personal information from children.

Policy updates

If we make a significant change, we will update the date on this page. For the website, a banner may announce a material change 30 days in advance. Archived versions are available on request.

Contact

Percentage — percentage.onl. Use the contact page if you have a privacy question.

Last Modified: 9 September 2026