Rachel's Tip Calculator
Tells you what to write on each line of the credit card receipt. Round the total, split the check, done.
A tip calculator that answers the question you actually have with the pen in your hand: what do I write on the tip line, and what do I write on the total line? Round the total up or down to something tidy, or split the check, and it works the arithmetic backwards. v2 is close.
Built for Rachel
This one started as an audience of one. My wife, Rachel, used to juggle two or three tip apps at the table, one of which ran a full-screen ad on launch and made her wait before she could even start. I figured I could do better than that for her, so I did. If it's useful to you too, that's a bonus.
The exact figures to write on the tip line and the total line. No mental arithmetic at the table.
Nudge the total up or down to a clean number and it back-solves the tip for you.
Divide by however many people, including the tip, with the remainder handled sensibly.
No account, no receipts stored anywhere — the one exception is your advertiser ID, and only if you allow it.