LetsPayTheBill.com is described as 'The goal is to automatically calculate cost allocations at a group event, by simply entering the spending paid by each person and the list of participants. In a few seconds the tool tells you who has to pay back how much to whom. You can send a link to the result by email' and is an website. There are more than 25 alternatives to LetsPayTheBill.com, not only websites but also apps for a variety of platforms, including iPhone, Android, Android Tablet and iPad apps. The best LetsPayTheBill.com alternative is Spliit, which is both free and Open Source. Other great sites and apps similar to LetsPayTheBill.com are Splitwise, Purrse, SplitBills and OneSplit.