Test your monitor, mouse & keyboard

Measure how many frames per second your browser is actually rendering in real time, with a live graph and min/avg/max readout.

Detect your monitor's true refresh rate (60Hz, 120Hz, 144Hz, 240Hz…) directly in the browser using the animation frame clock.

Instantly see your screen resolution, browser viewport, device pixel ratio, aspect ratio, and color depth — detected live. Plus measure your screen's true physical size in inches with a quick credit-card calibration.

Flood your screen with full-screen solid colors to spot dead, stuck, and hot pixels, plus backlight bleed — cycle red, green, blue, white, black and more.

Check that every button and the scroll wheel on your mouse works. Click left, right, middle, and side buttons to see them light up on a mouse diagram, scroll up and down to test the wheel, and catch double-click misfires from a worn switch.

Work out your effective sensitivity from your mouse DPI and in-game sensitivity — eDPI and cm/360 for consistent aim across setups.

Test your mouse's polling rate in hertz — how often it reports its position to your computer — with a live meter showing your current, peak, and average rate.

Test your mouse aim and precision — click targets as they appear and get your accuracy, hits, misses, and reaction time.

Press each key and watch it light up on a full virtual keyboard. Find dead, stuck, and chattering keys, check ghosting and key rollover, and see each key's code — with Windows and Mac layouts.

Test your typing speed in words per minute (WPM) and accuracy. Type the passage as fast as you can before the timer runs out, with live WPM, accuracy, a rank, and a speed-over-time graph. Pick 15, 30, 60, or 120 seconds.

See how many times you can hit the spacebar in clicks per second (CPS) — the spacebar challenge. Tap space as fast as you can before the timer runs out, with live CPS, a rank, a press counter, and an over-time graph. Pick 1 to 100 seconds.

Measure your keyboard speed in keys per second (KPS). Press any key as fast as you can before the timer runs out — works as a spacebar counter too, with live KPS, a rank, and an over-time graph. Pick 1, 5, 10, 30, 60, or 100 seconds.

Test a gamepad or controller in the browser — every button, trigger, and stick visualized live, with per-axis drift readouts and a rumble test. Works with Xbox, PlayStation, Switch Pro, and most third-party pads.

Measure your click speed in clicks per second (CPS). Click as fast as you can before the timer runs out — pick 1, 5, 10, 30, 60, or 100 seconds, including the Kohi 10-second test.

Measure how fast your reflexes are in milliseconds. Wait for the screen to turn green, then click as fast as you can — five attempts are averaged, with your last, average, and best times and a rank against the human average.

Take the classic Kohi click test from the Minecraft PvP server of the same name. Click as fast as you can for exactly 10 seconds — the clock starts on your first click — and get your CPS, a rank, and a second-by-second breakdown of the run.

Train your aim with three FPS-style drills — flick to shrinking targets, clear a grid shot of three at once, or track a moving target — with accuracy, targets per second, and a rank after every run.

Test your webcam in the browser — a live preview with the camera's real resolution, frame rate, megapixels, and brightness, plus a snapshot to check framing. Nothing is recorded or uploaded.

Test the touchscreen of a phone, tablet, or touch laptop for dead zones. Slide a finger across a full-screen grid — every square you touch lights up, and any that stay dark map exactly where the screen is not responding.

Test the gyroscope of a phone or tablet in the browser. Rotate the device and watch the live alpha, beta, and gamma readings — each axis is checked off once the sensor clearly responds, so a dead or drifting sensor shows up in seconds.

Test your microphone in the browser — speak and watch the live waveform and dB level meter, check your peak level and noise floor, and record a short clip to hear exactly what your mic picks up. Nothing is uploaded.

Test your speakers, headphones, or earbuds in the browser. Play a tone through the left, right, or both channels, sweep across the stereo field, and find out in seconds whether a channel is silent.

Measure sound levels with your microphone, right in the browser. A live decibel readout in estimated dB SPL or exact dBFS, peak, average, and minimum stats, and a reference chart of everyday sounds — nothing is recorded or uploaded.

Test your headphones or headset in the browser — play a tone through the left, right, or both channels, sweep the stereo field, check the balance and wiring polarity, and quiz yourself on which ear is which.

Stress test your CPU in the browser. One Web Worker per core loads the processor to 100% — watch live operations per second and per-thread activity, and get a score you can compare between devices.

Stress test your graphics card with WebGL. Render up to 10,000 rotating 3D cubes with heavy shaders, watch the live frame rate, and get a benchmark score with average, minimum, and 1% low FPS.

Test your RAM speed in the browser. Four passes — sequential write, sequential read, random access, and memory copy — measure how fast your machine moves data, with a GB/s score you can compare between devices.