Guides
Practical device-test how-tos, no fluff.
Clear, step-by-step guides to checking your gear: a webcam, microphone, speakers, keyboard, mouse, screen and connection. Each one is backed by a free test that runs entirely in your browser.
How to Test a Monitor for Dead and Stuck Pixels
Find dead and stuck pixels with full-screen colours, tell the two apart, and try to revive a stuck one.
Read guideHow to Test and Improve Your Click Speed (CPS)
Measure your clicks per second, see what counts as a good score, and learn how to click faster safely.
Read guideHow to Test Your Internet Speed Properly
Measure download speed and latency, and learn why real-world speed falls short of the plan and how to test fairly.
Read guideHow to Test Your Keyboard for Dead or Stuck Keys
Press keys and watch them light up on screen, read the key code, and test for stuck keys and ghosting.
Read guideHow to Test Your Microphone in the Browser
Watch a live level meter, record a clip to play back, and fix the usual reasons a microphone picks up nothing.
Read guideHow to Test Your Mouse for Double-Click and Button Faults
Check every button and the scroll wheel, and confirm whether a mouse that clicks twice has a failing switch.
Read guideHow to Test Your Speakers and Headphones
Play left, right and both-side test tones, run a frequency sweep, and pin down a dead, quiet or swapped channel.
Read guideHow to Test Your Webcam Before a Call
See your live picture, confirm the resolution, and fix the common reasons a webcam shows a black screen, in your browser.
Read guideSkip the reading — just use the tools
Every guide is backed by a free, in-browser test. Browse them all.
See all device tests