iPhone Screenshots


When it comes to nerd street cred, having a slide rule is not enough. You need to know how to use it!

Hence, Pocket Slide Rule Expert. This has the style of a classic rule, including great precision, but can also show you how to DO calculations. Learn simply by watching auto-slide-rule mode.

Select from 19 different basic operations, including:

-Multiplication and Division
-Squares, Cubes, arbitrary powers
-Logarithms, both natural and base 10
-Trigonometric and reverse trig functions

Think you can't perform precise calculations using a touch screen? Not at all! Try the newly-added "brakes" button. By holding it down, you can move the cursor and slider with extreme precision.

Are you a power user? Then check out the 'Snaps.' With the click of a button, quickly save a slider position -- and reuse it time and time again. Multiply by the square root of 2 a lot? Make a button for it!

Speed, accuracy, and a teacher right there with you.

What's New

Version 1.9

-Bug Fixes

Customer Reviews



Fun and easy to use. The "Wizard" feature makes it easy to learn how to use *any* slide rule. The "brakes" feature is REALLY nice and I use that feature more than I thought I would. Overall, I'm very pleased with this app. Great job!



I've always missed using a slide rule. This app brings back good memories. It's accurate, easy to use, especially with a built in help wiz. I like the looks, ths speed & also the brakes. Clear graphics, easy to read, just a VERY NICE app to have on your phone to learn how things were done "Back in the day"! Thank you very much!! A++++

Pocket Slide Rule Expert RULES!

Ron Charlton

This is a great app for understanding how practical calculations were done back when America went to the Moon (1969).

Moving the body, cursor and slide is by touch. The Brakes button is awesome! Adjusting the rule precisely is easy with it. The slide rule has excellent clarity on iPhone 4.

Overall, Pocket Slide Rule Expert is a delight for older engineers & scientists who had to work with the real thing, as well as for anyone with nostalgia.



Andrew Hall
17.1 MB
Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2011 TestTubeGames


  • Family Sharing

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

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