Switch Hitter is a keyboard diagnostic program that allows for key actuation testing and aims to alleviate difficulty in switch bounce/chatter diagnosis.

Different keyboard layouts can be selected from a simple drop-down list. Layout files are customizable, and any number of layout files can be added and easily selected.

Key switch "chattering," aka "contact bouncing," is a natural occurrence in mechanical switches that can cause one switch press to be detected as multiple presses. Digital electronics in a keyboard normally filter out the chatter and handle a small deviation in chatter in a properly performing key switch; however, if a switch is damaged or defective, the amount of chatter can become too large to be filtered. The result is a repetition of key input seen on your computer screen for only one intended key press.

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