计算轻松秘诀！一个简单的和开源小费计算器。
A simple and open source Tip Calculator.
* Enter bill via custom keypad
* Select tip by slider or three configurable buttons
* Round up/down by tip/total
* Split bill
* Exclude tax rate
I welcome patches!
This is the donate version. It is exactly the same as the free version. Purchase this version to support the dev.