Thanks for the suggestion! We currently support adding dummy users to a group on the web only. When you create a new group (or go to an existing group’s settings page), you should be able to add group members that have a name, but no email address. Hope that helps!
Updating since it’s been a while. Currently Square Cash does not have an API that we can use to integrate. At this point we would need Square Cash to change in order for us to do the integration.
Splitwise has some basic support for this now, depending on what you’re looking for. We now support multiple email addresses for a single account, so you can more easily share one account with multiple people.
However, we won’t automatically adjust how much you should owe as a “couple”. For example, if “Bob” adds an expense with “Sue and John’s Couple Account”, then the bill will be split 50/50 between those two Splitwise accounts. I can definitely see how it would be useful to automatically make Sue and John pay for 2 shares, but we’re unlikely to add that feature in the near future. For now, you can still work around this by manually using the “Split by shares” option when adding a bill, and assigning 2 shares to the relevant account.Julie Nguyen commented
It would be great if there was an option to add “family members” or “group members” in addition to just individuals. For example, you could add a contact with a phone number or email who would act as the “head of household” but also be able to add additional family members under the “head of household.” For example, we are currently planning a trip and want to split costs equally among 18 people. However, several of the attendees are young children who don’t have emails/phone numbers and wouldn’t even be responsible for settling up their bills. Instead of making dummy placeholders for all these children, it would be nice to be able to add “child accounts” under their parents’ account.