Hardware checks · in the browser

Check your hardware in the browser.

Check a key that is not registering, listen to your microphone, or preview your camera before a call. The tests run on your device without downloads, uploads or accounts, and each tool explains how it works.

Your display— Pixel ratio— Pointer— Reading this locallyyes

Input
Keyboard Tester
See which key events reach the browser, check for repeated presses, and measure how many keys register together.
Call check
Microphone Test
Watch the level and waveform, record a sample for local playback, and compare speech with background noise.
Display
Dead Pixel Test
Inspect solid colors for dead, stuck, or hot pixels. An optional flashing mode attempts to free stuck pixels; it is not a guaranteed repair.
Call check
Webcam Test
Preview your camera stream with resolution and frame-rate readings. Mirror the image or freeze a frame to inspect it.
Call check
Video Call Test
Check camera, microphone and playback before a meeting. Measure speaker-to-mic bleed and see whether each result is reported, measured or confirmed by you.
Input
Gamepad Tester
Check live button, trigger and axis values. Move the sticks, then release them to inspect drift.
Display
Screen Resolution Test
Read the pixel count reported by your browser. Calibrate with a bank card to estimate pixel density in ppi and the display's physical size.
Input
Click Speed Test
Count clicks during a timed run and see your CPS, or clicks per second, both live and at the finish.
Input
Mouse Test
See which mouse buttons and wheel movements reach the browser, and check for unintended double-clicks.
Input
Mouse Sensitivity Converter
Convert mouse sensitivity between titles, with eDPI, cm per 360 degrees and the formulas used.
Input
Reaction Time Test
Wait for green, then click. Compare five trials and their spread alongside the browser's measured frame interval.
Input
Spacebar Counter
Count spacebar presses, measure your rate, and check for chatter when one press registers more than once.
Input
Typing Test
Compare words per minute based on matching characters with raw speed based on everything typed. Accuracy, consistency and each formula are shown too.
Audio
Sound Test
Play left, right, both channels or a stereo sweep, then confirm what you hear on each side.
Audio
Headphone Test
Six channel trials use your answers to check for matching channels, swapped sides, a silent side or mono output.
Audio
Perfect Pitch Test
Name tones without a reference, or estimate the pitch difference you can distinguish in this session, measured in cents.
Audio
Water Eject
Play a low sweeping tone intended to move water from a speaker grille. The readout shows a calculated cone-travel ratio, not a measurement of your speaker.
Audio
Tone Generator
Generate a test tone from 20 Hz to 20 kHz, choose from four waveforms, and adjust the frequency while it plays.
Audio
Pitch Detector
Estimate a note's name, frequency in Hz and offset in cents against A4 = 440. The microphone readout includes signal clarity and messages when no result is available.
Audio
Vocal Range Test
Sing down, then up within a comfortable range. See the lowest and highest notes accepted during this run, their supporting readings, and the span in semitones and octaves. No voice type or score.
Timers
Classroom Timer
A fullscreen countdown with large digits, quick presets and an end chime, sized for projector use.
Timers
Interval Timer
Run Tabata at 20/10/8, choose EMOM, or set your own work and rest periods. Clock-based timing catches up after a background tab is delayed.
Display
White Screen
Show a white field for call lighting, tracing or a plain backdrop. Six other static colors are available.
Display
Black Screen Test
Use a black screen to inspect backlight bleed, stuck pixels and dust. Room lighting and panel type affect what you can see.
Display
Red Screen
Inspect a solid red field for stuck subpixels and uneven color, or lower your display brightness to use it as a dim red light.
Display
Grey Screen
Look for blotches, banding and color casts against a neutral mid-grey field, including dirty screen effect and mura.
Display
Refresh Rate Test
Measure browser frame delivery with its jitter and range. It usually follows display refresh rate, but is not a direct hardware reading.
Display
Touch Screen Test
Drag a finger across the grid to check which touches register. Numbered markers track multiple contacts and help you inspect missed or unexpected touches.

Test a whole device class

Guides

Read the guides for explanations of the measurements, common causes of faults, and practical troubleshooting steps:

Why these tests run locally

Your browser can read key events, analyze microphone samples, and display test patterns without uploading those test inputs to a server. These tools process inputs and results in the page, on your device. Loading the site still requires ordinary page requests; your test data stays local.

Each tool explains what it measures, how it calculates the result, and where its limits are. Read the site-wide methodology for the distinction between reported, measured and user-confirmed values, when a result is refused, and how privacy, sources and corrections are handled.