What are some alternatives?
When comparing Tabbt and Splitwise, you can also consider the following products
Kittysplit - The easiest way of sharing costs with a group of friends
SplittyPie - Create event, add users and their expenses.
WieBetaaltWat - With WieBetaaltWat you can manage a list with your shared expenses.
ihatemoney - Manage your shared expenses, easily
Tricount - Manage and share expenses with friends
Splid - Splid helps friends manage their money.