Today, in honor of Pi day, I will be looking at calculator apps. I find it amazing that the iPad did not come with a calculator app, so I find myself launching numbers for some calculations. On the iPhone, I use the basic calculator app that comes with iOS.

A quick google search recommends calculator HD for the iPad, this feature rich app has a great looking interface. The team over at www.crowdcafe.com has done a lot of nice work on the look of the app.

I have been using calculator 7thg, which I bought as an impulse buy some time ago, but I have been disappointed in the past that it required I use the screen even when I am using a Bluetooth keyboard.

What is your favorite calculator app, and are they developed locally?