With a great interface and an even greater set of features, WhoseBill has arrived intent on becoming the standard way for people to track their every IOU from now on. This new web service can take care of tracking all that is owed, offsetting payments against each other and then settling everything up when the time comes. All that users have to do is to input what they’re paying on behalf of friends for the application to remember it all for them. The idea is that their friends will be doing exactly the same thing. WhoseBill is taking care of totaling everything up.
Moreover, users of WhoseBill can create pools with specific groups of friends, and have traditionally complex expenses (EG, arranging a club or a group holidays) dealt with in an almost instant way.
WhoseBill is going up against services like Expensure and What.io. They mostly do the same thing, and WhoseBill might be able to claim some higher ground when the iPhone app which is being developed right now sees release.
WhoseBill.com In Their Own Words
WhoseBill is the easiest way to take care of IOUs and shared bills with friends
Some Questions About WhoseBill.com
Will smartphones other than iPhones be supported one day? 
