iPhone Screenshots


Now through PI day (3/14), you can get iSlideRule for a lower price. Normal pricing resumes on 3/15.

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

There are 80 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 3.0.0

Updated errors in the integrated help documents. Updated app to provide better support of latest iOS versions, as well as newer device models.

Ratings and Reviews

5.0 out of 5
3 Ratings

3 Ratings

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!

flitetym ,

If you're “into” slide rules ...

This is the best out there. Math “purists” will love it.

Entrada2003 ,

Version 1.1.0 Comes Through!

I downloaded this app half a year ago, and while I was impressed with a lot of things about it... slide movement, graphics, scales to choose from... the inability to rearrange scales, especially having C above D on the slide and stator respectively, made it fall short. The developer promised an update was in the works, and he really came through with this one. Outstanding implementation of a slide rule on an iPod/iPhone interface. A solid 5 stars, and worth waiting for.

App Privacy

The developer, Reid Performance Designs, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

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

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