Hardware Tester is a growing collection of free, browser-based tools for checking that your computer's hardware actually works. Most people arrive for one of a few reasons: a video call starts in five minutes, a device is playing up and the warranty window is closing, or a second-hand laptop needs looking over before money changes hands. Each check runs in seconds, with nothing to install.
Every test runs entirely in your browser using standard web APIs. The same ones your apps already use to reach your camera, microphone and controllers. That means results are instant, work on phones and desktops alike, and nothing you test is uploaded or stored. Pick a test above to get started; more are on the way.