Say two people go on holiday and want to equally contribute to the costs e.g. food, car rental, accommodation etc. They do not have any joint credit cards, therefore they decide to pay for stuff alternately and somehow account/balance their contributions so that at the end of the trip they would have contributed as close to 50/50 as possible.
I am wondering if there is a software/website/app that would allow that. It would keep payment transactions recorded showing who paid, how much, in what currency and ideally it will show who has currently paid more and so who is the next one to pay.