How often after a meeting with friends have you tried to decide who owes money to whom?
Should vegetarians pay for everyones meat, and all the rest pay for soy sausages? Or how much do friends owe for a pizza, if one of them ate 3 slices, and all other ate 2 slices each?
If the party was a success, then it's unlikely that you will be able to solve it right away. And even if you do, everyone will ask: why should I pay so much money if I did not eat almost anything? Nothing spoils a good party so much, like mutual financial claims.

2Split - Your personal assistant in solving all these problems!

— Create meetings, add participants and their purchases during the meeting
— Check who participated in the consumption of certain products and in what proportions
— Add time-based purchases (house rental, etc)
— Track money transfers between participants