I believe (might be wrong!) there was literally one guy working on it so anything in their personal situation could be the reason

It’s hard enough to find a good alternative, let alone a FOSS one… So sad to see KC and SUMO go…

Oh, my bad, somehow missed we’re on the foss community. No, I don’t know any foss alternative

Why not stay with Splitwise? The free version I’ve got allows to set multiple unequal payers and split (un)equally…

Would you say it makes sense to have accounts on the 2-3 instances that you’re most interested in rather than 2 account and being dependent on federation?