IconVault's Device Sensors playground listens to the real `DeviceOrientationEvent` and `DeviceMotionEvent` streams: a 3D cube rotates as you tilt your phone, with live alpha, beta and gamma readouts, accelerometer and gyroscope values, and the iOS permission flow handled the way production apps must handle it. It is free and runs fully in your browser.

You will learn the Euler angle conventions (which axis is which, and where gimbal lock bites), why iOS 13 and later needs an explicit permission tap from a user gesture, how a low-pass filter smooths jittery sensor data, and why desktops honestly show no data: without motion hardware there is nothing to read, and this tool says so instead of faking numbers.