Split a bill unevenly
For the moment at the table, when you didn't all eat the same. If you did, split a bill is quicker. If several of you paid for different things over a trip, use who owes whom.
One of you had the steak and two glasses of wine. One had a salad and tap water. Dividing it four ways isn't fair. Put the bill in line by line and tap who had what.
Pick whoever's card went down and this works out who pays whom.
Both are spread in proportion to what each person ate — not divided flat. The steak carries more of the service charge than the salad does.
Split evenly, everyone would pay $50.61. The gap between the biggest and smallest share here is $57.96.
Tax and tip don't split evenly either
This is the bit almost every bill-splitter gets wrong. You carefully work out that one person had $42 of food and another had $14 — then divide the 20% service charge equally between them and undo your own arithmetic.
A service charge is a percentage of what was ordered. If your share of the food is three times mine, your share of the service is three times mine too. Divide it flat and the light eater at the table subsidises the heavy one all over again.
So tax and tip here are apportioned in proportion to each person's subtotal. The person who ordered the steak carries more of it, because they caused more of it.
Sharing a single item
A bottle of wine between three of you, a starter for the table, one dessert with four spoons in it — tap everyone who had a go and the line divides between just those people.
When it won't divide cleanly, the remaining pennies are handed out one at a time rather than rounded away, so the lines always add back to the exact bill. You will never close this page with a total that doesn't match the paper in your hand.
And if a line has nobody on it, the calculator says so rather than silently dropping it.
You just typed out a whole receipt.
Stub reads it off a photo instead — every line, the tax, the service — and hands each item to whoever had it. Then it remembers, and asks the people who owe you. Free, with no daily limit.
Nothing you type here is sent anywhere or stored. Stub records what people owe each other; it never holds or moves money.