iSlideRule 4+

Fully customizable sliderule

Reid Performance Designs

    • 5.0 • 6 Ratings
    • $0.99

iPhone Screenshots


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

There are nearly 100 different scales supported by iSlideRule, including scales for dimensional analysis. From the set of scales provided, 12 can be selected for the top and bottom rules, as well as the slide, in groups of 4 scales each. Double-tapping each rule selects the next group of 4 within the application. A two-finger pan left or right on the center slide provides viewing of the index ends, while one finger swiping up or down on the cursor changes color schemes dynamically.

The application supports rotation of the handheld, allowing the sliderule to take full advantage of the display, and has 11 selectable color schemes to customize your sliderule to your favorite color.

What’s New

Version 3.1.2

Update to correct an issue when running on iPad

Ratings and Reviews

5.0 out of 5
6 Ratings

6 Ratings

Circiter ,

To the developer: Could you…?

Hello there! I, like every person that has reviewed your app, love what you have done with it!

However, allow me to suggest an improvement: Would it be possible to move/alter both the Portrait and Landscape orientation implementations so that the Dynamic Island does not intrude with the display? That would make your app a 5+ star app.

Old School Pilot 2 ,

Great tool

I too am a slide rule collector and student. This app is very customizable and intuitive. I can set it up to match many of my grandfather’s old slide rules. Also has a great description area. But what I love most is that this app does not track any of your information. Good job!!

a satisfied user ,

Very well made

Makes best use of screen. All seems to work as it should. I'm a slide rule collector, so nice to have good one on mobile device. The only iPhone slide rule app I know of which has trig scales. Well done!

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.

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