Support

Scale-o-Tron is available as a one-time purchase on the App Store. There are no subscriptions or in-app purchases.

Scale-o-Tron runs on iPhone and iPad with iOS 17 or later.

Yes. In Settings → Scales you can create custom scales, including derived scales calculated from measurements in your project.

Version 1 locked the equal button to a single unit for all conversions. With version 2 you can mix up to five units and scales for conversions at any time without having to reassign the equal button. In addition, you can build and save unique calculators, each with their own scales, units and other settings, giving you unlimited project optimization. See the help section on Setup: Scales and Units for more details.

If a value is too wide for the display, the calculator will make the result text thinner to fit. You can change display height in Settings → Buttons and Display Size.

Absolutely! Just select the scale and unit of your measurement and the calculator will convert to any other scale and unit you want. This is very useful when you are creating dioramas, architectural models, adapting kit parts, or building in forced perspective. You can even mix units and scale inside of math expressions.

English, Chinese, French, German, Italian, Japanese, Korean, Polish, Portuguese, and Spanish. If you find text or formatting that needs correction, please send us an email.

No. Scale-o-Tron does not collect, transmit, or store any personal data. See our Privacy Policy for details.