Developed to train myself, this is a valuable App for those who want to become better with their slide rules—or even those who just want some practice with mental arithmetic estimation—RuleCoach is both a coach and a proctor that aims to improve your speed and accuracy with your slide rule.

Exams cover a wide range of scales found across many rules, and includes helpful instructions that will guide you in calculating solutions!

Includes a unique calculation error metric calibrated to the linear misalignment of the physical components in addition to traditional calculation error percentages.

What’s New

Version 2.0

Complete re-write in Swift and SwiftU for full support in all iOS 13 and iOS 14 devices!

Ratings and Reviews

4.0 out of 5
1 Rating

1 Rating

App Privacy

The developer, Jeffrey C. Reinecke, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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