No, unfortunately there is not. I don't have the resources to develop a mobile app at this time. However, the site has been designed to work very well on all mobile devices using a web browser. You can even make a shortcut on your phones' home screen: in iOS, open up the site using Safari and click on the share button (the square with the arrow pointing up) and click on the "add to home screen" button. An icon will be created that goes directly to Undebt.it.