Bench-grade checks · in the browser

Test your hardware in seconds.

Something acting up before a call, after a spill, or on a brand-new machine? Run the check right here. No downloads, no uploads, no accounts — every test executes on your device, and every tool publishes exactly how it works.

Your display— Pixel ratio— Pointer— Reading this locallyyes

Input
Keyboard Tester
Press every key and watch it register. Find dead keys, chattering switches, and measure rollover.
Call check
Microphone Test
Live level meter and waveform, record-and-playback so you hear what a call hears, and a noise-floor to speech signal-to-noise measurement.
Display
Dead Pixel Test
Cycle solid colors to spot dead, stuck, or hot pixels — with a stuck-pixel fixer mode.
Call check
Webcam Test
See what your camera sees: live preview with resolution and frame-rate readout, mirror toggle, and a freeze-frame check.
Call check
Video Call Test
Camera, microphone and playback in one pass before a meeting, plus a speaker-to-mic bleed measurement — and a summary that says how it knows each row.
Input
Gamepad Tester
Press every button and work both sticks — live button, trigger, and axis readout that also catches drift.
Display
Screen Resolution Test
What this display is: the pixel count your browser reports, its pixel density in ppi, and the physical size of the glass — measured with a bank card.
Input
Click Speed Test
Click as fast as you can in timed runs and get your CPS — clicks per second, live and at the finish.
Input
Mouse Test
Light up every button and the wheel, and catch double-click misfires from a worn switch.
Input
Mouse Sensitivity Converter
Move one aim between titles — eDPI, cm per 360 degrees, and every formula printed.
Input
Reaction Time Test
Wait for green and click. Five trials, the spread that matters, and your display's share of it.
Input
Spacebar Counter
Count spacebar presses, measure your rate, and spot chatter — a spacebar that double-registers.
Input
Typing Test
Words per minute over the characters that matched, raw speed over every character you typed, accuracy and consistency — with the formula behind each printed on the page.
Audio
Sound Test
Left, right, both, and a stereo sweep — confirm each channel plays and lands on the correct side.
Audio
Headphone Test
Six randomised trials and a computed verdict — correctly wired, channels swapped, one side dead, or mono.
Audio
Perfect Pitch Test
Name tones with no reference, or measure the smallest pitch difference you can reliably hear, in cents.
Audio
Water Eject
A low sweeping tone to push water out of a speaker grille, showing the cone travel it asks for.
Audio
Tone Generator
A precise test tone from 20 Hz to 20 kHz in four waveforms, with live frequency control.
Audio
Pitch Detector
The note in the room as an estimate the page can stand behind — name, Hz and cents against A4 = 440, from your microphone, with a clarity figure and honest refusals.
Audio
Vocal Range Test
Sing down, then up: the lowest and highest note it could stand behind, the span in semitones and octaves, and the evidence for each end. No voice type, no score.
Timers
Classroom Timer
A fullscreen countdown with huge digits, quick presets, and a gentle chime — built for projectors.
Timers
Interval Timer
Tabata at its real 20/10/8, EMOM, or your own work and rest — accurate even in a background tab.
Display
White Screen
One click fills the screen with pure white — a soft light for calls, a lightbox for tracing, a clean backdrop. Six more colors included.
Display
Black Screen Test
Pure black across the whole panel exposes backlight bleed, stuck pixels, and every speck of dust before cleaning.
Display
Red Screen
A solid red field that lights only the red subpixels — catch stuck pixels, or dim it into a night-friendly work light.
Display
Grey Screen
Neutral mid-grey — the field that shows dirty screen effect, mura and colour cast that white washes out.
Display
Refresh Rate Test
Measure how often the browser draws a frame — normally your display's Hz — with the jitter and range shown, not just a rounded number.
Display
Touch Screen Test
Drag a finger across a grid that paints every registered touch — dead zones and ghost touches have nowhere to hide, and multi-touch is tracked with numbered markers.

Test a whole device class

Guides

The deep dives behind the tools — what the numbers mean, what causes the faults, and which fixes actually last:

Why these tests run locally

Hardware diagnostics don't need a server. Your browser can already read key events, meter a microphone, and paint a screen — so that's all these tools do, with the code running on your machine and nothing sent anywhere. It's faster, it works on a flaky connection, and it means testing a microphone doesn't require trusting a stranger with your audio.

Each tool's page explains its method — what's being measured, how, and where the limits are. Read the site-wide methodology for the evidence states, refusal rules, browser limits, privacy enforcement, sources, and correction process behind those page-level explanations.