The best alternatives to FairPay are Splitwise, Wrekt, and Poool Party. If these 3 options don't work for you, we've listed a few more alternatives below.
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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 & Android!
Poool Party lets you split shared expenses through Venmo without requiring your friends to sign up! Setup recurring Venmo requests or seamlessly split your dinner bill.
The utility for quick and fair bill splitting. Just scan bill items (or enter manually) and assign them to persons. After choosing who paid the bill, you will see a list of settlements — how much who owes to whom — you can share it.