I made this lightweight Flask app designed to make checkout math faster, clearer, and more accurate. It helps users calculate the discount amount and final price before making a purchase or a cashiers who have to do coupons manually (like me), while keeping the logic strict enough to prevent bad input and messy rounding. [The link to the live app is below:] Open Coupon Calculator Why I built it I’ve been working toward becoming a better developer and engineer, and one of th...