When it comes to enterting new bills, WhoseBill and BillMonk have fairly similar terminology. In WhoseBill, Joint Bills are the equivalent of BillMonk's Shared Bills and Itermised Bills - the feature sets aren't identical, but WhoseBill's Joint Bills allow you to add simple or complex bills shared between multiple people. We're always looking to add new features, so if you've just moved to WhoseBill and are missing a feature from BillMonk, please email us at firstname.lastname@example.org and we'll put in on the list for future development.
Loans and debts work very similar between the systems, and Repayments in WhoseBill are the rough equivalent of Payments in BillMonk. In WhoseBill, we also have the concept of Settlements which automatically generate the most efficient set of repayments based on all the outstanding debts, in any currency!
One thing that may be new for previous BillMonk users, is that in WhoseBill bills can be entered before they have actually been paid. This helps to keep track of the household bills that need to be paid by someone in the house, or to make requests for loans or repayments. When entering a bill, you can choose who paid (single person or multiple), or leave it unpaid to put it in everyone's inbox for attention.
Another useful feature in WhoseBill is the ability to approve and contest bills from within the system. This means that WhoseBill is open enough to allow anyone to add bills involving others, but gives you the power to contest or block bills that you don't agree with
WhoseBill and BillMonk allow you to invite your friends to join by email so that you can start tracking debts between you. However, WhoseBill also lets you add friends without actually inviting them straight away.
This can be really useful if you paid for something with a group of friends, but there were some friends of friends present for whom you don't yet have an email address. WhoseBill lets you add the bill straight away, creating a new friend with just a name, and you can return later to invite that person to signup, or connect with them using their email address.