It is customary to pay a 15% service fee. That's a math problem. Got some friends to divide up the bill? another math problem. Division, subtraction, percentage, more math problems - way too much work. This app is the most intuitive tip calculator, just type in the amount, don't even need to bother with the decimal. Pay with the credit card and just fill in the blank and sign. Done. New for version 1.1 is dark mode, perfect to use in restaurants. Free and no ads.