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Pros
Pro Free to use
Pro Simplifies debts in a group
If A owes B $10, and B owes C $10, then the app simplifies that to A owes C $10.
Pro Integrates with 3rd party payment providers
When you want to settle up the differences, you can do so from the app.
Pro Simple to use and intuitive
It has a nice and straightforward interface that can nevertheless surprise you with the wealth of options it supports.