iPhone Screenshots


Have you ever used a slide rule? Ever been curious about the way slide rules can be used to solve complex math expressions? Would you like to learn how slide rules work? Slide rules were used for literally hundreds of years before calculators and in some areas can be much more useful than calculators.

iSlideRule is a fully configurable slide rule app supporting multiplication, sines, tangents, cosines, cotangents, roots, squares, logarithms, and hyperbolics.

There are 80 different scales supported by iSlideRule. 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. Two-finger panning on the slide provides viewing of the index ends, while one finger swiping on the cursor changes color schemes dynamically.

The application supports all orientations of the handheld, rotating 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 2.2.0

Added ability to change/configure settings within the application.
Removed iSlideRule from the normal system settings application.

Ratings and Reviews

If you're “into” slide rules ...


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


Service Bandit

Well I'm just an amature at this but I can honestly say this thing works! People have complained that there's not enough realestate showing of the rule on the screen and everytime they scroll over they upset their adjustments to find the answer. It allows u to scroll in either direction using so the center line thingy and works great. I only wish it had E6b log scale or that it could be set to a bezel "prayer wheel" for pilots use. But other then this wish, it's perfect in that u don't have to carry one in your pocket. Thanks fir the nice effort guys!

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.


Stephen Reid
8.9 MB
Requires iOS 7.1 or later. Compatible with iPhone, iPad, and iPod touch.
English, Dutch, French, German, Greek, Italian, Japanese, Portuguese, Russian, Spanish, Swedish, Thai, Turkish
Age Rating
Rated 4+
© 2008-2015 Reid Performance Designs, All Rights Reserved.


  • Family Sharing

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

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