A seven segment display, as its name indicates, is composed of seven elements. Individually on or off, they can be combined to produce simplified representations of the Arabic numerals.
This app takes four bits in form of checkboxes as input and illustrates this dual number according the rules of Boolean algebra as a hexadecimal output value. The input can be changed manually by clicking one of the Checkboxes or automatically by clicking the "Demo"-Button, which varies the input from 0 to 15. The app works with two different layouts for portrait- or landscape-mode and supports several languages, currently English and German.