UsefulTab
Hardware Test
Test your keyboard, mouse, mic, webcam, speakers, and screen — right in the browser.
15 tools in this category, all running locally in your browser.
Check that your computer's hardware actually works, without installing anything. This category puts your keyboard, mouse, microphone, webcam, speakers and headphones, and display through quick, visual tests: press keys and watch them light up, trace mouse movement and clicks, measure your mouse polling rate, see your microphone level move, preview your webcam, play left and right channel tones, hunt for dead or stuck pixels, gauge your screen's refresh rate, and confirm your resolution and color output. Every test runs entirely in your browser using standard web APIs, so your camera and microphone feeds are shown to you and never uploaded or recorded — nothing leaves your device.
Keyboard Tester
Test every key on your keyboard — pressed keys light up on a live layout, with key names and codes.
Mouse Tester
Test your mouse: left, right, middle, and side buttons light up, movement is traced, and scroll direction is shown.
Double-click Tester
Test whether your mouse registers accidental double-clicks — see the gap between clicks in milliseconds.
Mouse Polling Rate
Move your mouse to measure its polling rate in Hz — how often it reports position (125, 500, 1000 Hz).
Microphone Test
Test your microphone: see a live input-level meter and waveform, pick a device, and confirm it picks up sound.
Webcam Test
Test your webcam: see a live preview, pick a camera, and read its resolution and frame rate.
Speaker Test
Test your speakers: play a tone to the left channel, right channel, or both, and confirm each side works.
Headphone Left/Right Test
Test headphone channels: play left and right tones on demand or run an automatic left-right sequence.
Screen Test
Test your monitor with full-screen solid colors and patterns to spot dead pixels, backlight bleed, and uniformity issues.
Dead Pixel Test
Find dead and stuck pixels: cycle solid red, green, blue, white, and black full-screen and inspect for off or wrong-color dots.
Refresh Rate Test
Measure your monitor's refresh rate (60, 120, 144 Hz) by timing browser animation frames — with current, average, and peak.
Touchscreen Test
Test your touchscreen: draw with your finger, see each touch point tracked, and check multi-touch support.
Browser Permissions Test
Check browser permissions: see the granted, denied, or prompt state for camera, mic, location, notifications, and more.
Display Resolution
Show your display info: screen resolution, browser viewport size, device pixel ratio, color depth, and orientation.
Color Test
Test your screen's color: full-screen solid RGB and CMYK fills, smooth gradients, and grayscale ramps to check color accuracy and banding.
Common questions
Do the webcam and microphone tests upload anything?
No. The camera preview and microphone level meter run entirely in your browser using the getUserMedia API. The video and audio are shown to you live and are never recorded, saved, or sent to any server — the moment you close the tab, access ends.
Why does a test ask for permission?
The webcam, microphone, and some other tests need your explicit browser permission to access that device — that is the browser protecting you. You can grant it for the test and revoke it anytime; UsefulTab only uses the access while the test page is open, locally.
Are these tests as accurate as native diagnostics?
They are a fast, no-install first check that catches the common problems — a dead key, a stuck mouse button, a silent channel, a dead pixel, a low refresh rate. For a definitive hardware fault diagnosis, a manufacturer's dedicated utility may measure more, but for confirming whether something works these browser tests are reliable and immediate.