Vintage iPhone apps are all the rage. Whether it be a rotary phone app or this old school Hewlett Packard calculator app, there is no doubt that we are seeing styles of the past being revived in the present.

The three vintage calculators are replicas of the HP 12c, HP platinum and HP 15c. The programs work almost identically to the original calculators and you even get a sense of using the device in 3D with the aid of the programs technology and the infinite capabilities of the iPhone.

It’s time to crunch some numbers in style.