You just got a brand new iPad. Great! You go through the process of setting up your shiny new device. You then start exploring every part of your new tablet.

Wait a minute... Where's the calculator app? It's present on your iPhone. You search around your home screens. No calculator.

"Okay," you think. "I will simply go to this wonderful App Store and download myself a free one." You do so.

After about a week of using the free one, you notice a disturbing trend: the app displays an ad every ten button clicks. You think you can put up with it.

Then you realize you can't.

You then delete the offending app and search frantically around the App Store for a free calculator app with no ads that won't limit you to two decimal places or has thirty trillion different in-app purchases.

Nothing. There are none.

There's plenty of wonderful paid calculator apps, of course. But you don't want to pay real money for such a simple function. After all, your iPad is ONE BIG CALCULATOR. Everything the iPad does revolves around math some way or another.

That's where this app comes in.

This app is a simple expression calculator (meaning it knows order of operations and such.) You can enter things like:

128/2 (= 64)

2/(3+2) (= 0.4)

2/(3+1) - 5^2 (= -24.5)

sqrt(25) (=5)

10-3% (=9.7)

And best of all... NO ADS! Nowhere? Nowhere.

So how are we making money? We aren't. We wanted to build a capable calculator for free. Just to see what happens. So go ahead. Download it. Try to find an ad.