I and a friend started to develop a mobile application to tip. The idea is to not use an alphanumeric keyboard but instead mobile-friendly gestures (swipe, pan). Experimentations and work in progress as product gets build.
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Swipe up/down to set bill amount.
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Swipe left and right to change tip percentage.*
*This is slow because I really wanted to dive in into some details. This however needs tweaking to work well when faster input.
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Long press to make total amount more accurate.
