Hey everybody, I'm the developer of iPhi, which is an incredibly powerful calculator and a universal question answering App. It solves problems in the field of mathematics, physics, chemistry, biology, economics and many more. Also it is able to answer questions in the fields of geography, history, music and many more... As a backend it uses the well known Wolfram|Alpha™ Computational Knowledge Engine™, that it presents without distractions and it automatically puts the focus of the window on the content. One of it's unique features is that it provides specialized input forms for regularly occurring mathematical problems like differentiate, integrate, solving linear algebra problems, 2D-/3D-plotting and solving equations. All these problems can be complicated to type into a single lined input text field that Wolfram|Alpha usually provides. Here iPhi comes into play and makes things much easier for you. Also it has built in support for Wolfram|Alpha Pro! Here's the link to the webpage: http://www.coldx.net/iPhi/en And here directly to the Mac App Store where it's for sale for $1.99: https://itunes.apple.com/us/app/iphi/id795810915?l=de&ls=1&mt=12 If you have any feedback, feature requests or any other questions... let me know! ;-) Hope it helps!