Fine company. They like brainstorming and customizing apps to meet their clients needs. The Mortgage Calculator Plus is free and fantastic !
Here's what it can do: https://itunes.apple.com/us/app/mortgage-calculator-plus/id518394445?mt=8
But you might like mine, too: http://activerain.com/blogsview/3821516/the-extremely-famous-principal-interest-taxes-insurance-calculator