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Gamepad Tester and Debugger. When connected, this tool displays the current state of your gamepads, inputs, joysticks, and anything else that can be reported by the HTML5 Gamepad Api. This is also useful for debugging drifting joycons, broken controllers, experimental hardware, and more.
Microphone Tester. Quickly check if your microphone is working, or diagnose possible problems with your audio hardware. It shows a realtime spectrum of frequencies, and a spectrogram of the frequencies over time.
Gamepad Tester. Displays info about all gamepads connected to your computer. Check buttons, joystick axes, drift, and more. Works with all controllers and joysticks in a modern browser.
How much memory your GPU has. Measured (in 2024) in gigabytes, or billions of bytes. More RAM means more space to store textures and 3d models. More is better. Memory Bandwidth. How quickly your GPU can move data (textures and geometry) between the main chip (where work is done) and the memory (where data is stored).
Using the HTML5 gamepad api in your own apps.
This is a midi keyboard tester. It shows you which keys are pressed, and the midi events that are being sent by your keyboard. It's useful for debugging keyboards, or for learning about the midi protocol.