This calculator is so much better than Apples default one on the iPhone. The touchpad is much more precise (thats a huge deal), the functions are really well designed with a simple, unobtrusive UI (its difficult to create that), and the themes are really nice with your choice of a wide spectrum color palette (a nice change for a routine tool and with rich color choices, much less utilitarian & drab than app norms). The integrated currency converter is beautifully designed (& also saves a step, no more hopping over to the XE app) and the ability to view your calculation history is just brilliant. Both functions were also created with the unobtrusive UI in mind. Thanks for the great effort! Ill never use the default calculator again.