The math of splitting a dinner bill is trivial. So why does it ruin the end of a good night?
The friction was never the arithmetic
It's the awkwardness. Who owes whom, who forgot their wallet, who "I'll get you next time"-d their way out of it three times running. The numbers were never the hard part. The feelings were.
Design the awkward away
The best split-the-bill experience isn't the one with the most features. It's the one that makes nobody feel like the unpaid accountant of the friend group.
Great friendships don't stop at the bill.
That single idea became WhatsYourShare — settling up so frictionless the money part disappears and the evening doesn't.
The best software doesn't solve the equation. It removes the reason you were dreading it.