Measurements first.

CTRLCHK is a browser-based diagnostic workspace built to make controller behavior understandable. It keeps observed measurements separate from product guidance, so you can always inspect the underlying signal.

Health classifications are versioned guidance, not universal hardware specifications. Confidence reflects mapping support, sample sufficiency, stage completion, and browser capabilities.

No controller input needs to leave your device. The Gamepad API is polled locally and reports are generated in your browser.