What are some alternatives?
When comparing SplittyPie and WieBetaaltWat, you can also consider the following products
Splitwise - Splitwise is a free tool for friends and roommates to track bills and other shared expenses, so that everyone gets paid back. On the web, iPhone, and Android!
Kittysplit - The easiest way of sharing costs with a group of friends
ihatemoney - Manage your shared expenses, easily
Tricount - Manage and share expenses with friends
Splid - Splid helps friends manage their money.
Splittr - Splittr helps you to split group expenses and is so easy to use.