A tool to test your keyboard keys for Ghosting and X-Key-Rollover. This might be especially useful for gamers.

Ghosting is the problem that some keyboard keys don’t work when multiple keys are pressed simultaneously. The key presses that don’t show up on the computer or seem to have disappeared are said to have been “ghosted”. On most keyboards this happens with many three key combinations. Imagine playing your video game and not being able to, say, run diagonally and fire your weapon at the same time; say pressing a, w, and g simultaneously. This is a result of the internal design of most existing keyboards.

Use this tool to see how ghosting affects your keyboard, and calculate the maximum simultaneously pressed keys possible.

Open the tool, and start to press the keys you want to test for ghosting. Simultaneously pressed keys will be enumerated and shown in the bottom of the program.

You can also change the way the keyboard keys are displayed.

Read the program’s help if you have any further questions.