Paul Evangelista
Paul Evangelista. Multifaceted designer.
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Perculate

This utility enables you to quickly find the percentage of or percentage off an amount using a playful interface and intuitive slider.

 
 the top half allows the user to input a new value. the bottom half toggles the calculation from percentage of (for tips) and percentage off (for discounts).
 

designer Paul Evangelista • developer Tomas Bulva
Created and funded as an internal project at c|change