iSlideRuleHD 4+

Fully customizable sliderule

Reid Performance Designs

    • 4.5 • 2 Ratings
    • $0.99

iPad Screenshots


iSlideRuleHD is a fully configurable sliderule app supporting multiplication, sines, tangents, cosines, cotangents, roots, squares, logarithms, and hyperbolics.

There are nearly 100 different scales in iSlideRuleHD, including scales that support dimensional analysis. From the scales provided, 15 can be selected for the top and bottom rules, as well as the slide, in groups of 5 scales each. Double-tapping each rule selects the next group of 5 within the application. A two-finger pan left or right on the center slide allows viewing either the left or right index of the body.

The application supports all orientations, rotating the slide rule to take full advantage of the display, and has multiple color schemes to customize your slide rule to your favorite color. A single-finger swipe on the cursor up or down dynamically changes the color scheme.

What’s New

Version 3.1.1

Updated handling of initial user default settings

Ratings and Reviews

4.5 out of 5
2 Ratings

2 Ratings

Raemann ,

Hard to beat for free!

This is a wonderful introduction into what a slide rue can do and it is a great way to have one with you without the risk of it being damaged. Slide rules are not cheap today, as if the really ever were. Carrying one about can be a risk. Mine are very important to me. I do not want anything to happen to them so having one in the iPad is a significant boon. No it isn’t perfect, but then, it’s FREE!

gtscientist ,

Awesome App

This is a beautifully done app, very professional looking. It basically allows you to transfer almost any combination of slide rules to the iPad, from the simplest ones to the most complicated log-log rules as well as to invent your own unique rules. the interface is very simple and elegant and is actually even easier to use than a physical slide rule. it looks stunning on the retina display. About the only feature I would like to see added is the ability to remember the slide rule state (cursor and slide positions) when reopening the app. Kudos to the developer. I have seen many slide rule apps over the years and none even approaches the look and utility of this one. it allows you to do things that would be cumbersome to program on a calculator and the displaying of the decimal values alongside the cursor makes it very practical for real-world calculations.

edmoonus ,


This is a great product for those who love slide rules and the slide rule's ability to enhance the learning process for mathematics. The ability to customize so many different (70+) scales in groups of five is very impressive. The attention to detail for the gage points (key constants such as pi, e, unit conversions, etc.) shows a deep appreciation for the art.

App Privacy

The developer, Reid Performance Designs, 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

    Up to six family members can use this app with Family Sharing enabled.

More By This Developer

You Might Also Like