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.

Detect your display's native resolution, pixel ratio, aspect ratio, and color depth, then run a fullscreen 1-pixel test pattern to spot scaling, blur, and non-native output.

Test your monitor for ghosting, inverse ghosting, and motion blur. Follow the moving object with your eyes to reveal trailing and coronas, with an adjustable speed and background.

Detect dropped or skipped frames on your monitor. The test times every animation frame, measures your true refresh rate, and flags each missed frame live with a running skip count.

Check your monitor's gamma with a visual calibration chart. Match the gray squares to read your display gamma, confirm the sRGB 2.2 target, and spot banding or black crush.

Step through full-screen solid colors, grayscale ramps, color bars, sharpness, geometry, and contrast patterns to check your monitor for dead pixels, banding, uniformity, and more.

Set and check your monitor's brightness with a full-screen shadow-detail test, luminance gradient, grayscale bar, and solid fields — dial in the black level and backlight.

Set and check your monitor's contrast with a full-screen highlight-detail pattern, a black-to-white gradient, and a dynamic-range check — dial in the white level without clipping.

Reveal raised or crushed blacks with full-screen pure-black, near-black step, and gradient patterns — check your monitor's black level and shadow detail in a dark room.

Check your monitor's white level, peak white, and highlight detail with full-screen white, near-white step, and grey-to-white gradient patterns that reveal tint and clipping.

Cycle per-channel gradients, a hue sweep, grayscale, and solid color fields in full screen to spot color banding, color cast, and your monitor's true bit depth.

Fill the screen with grey, white, and RGB fields to reveal clouding, mura, tint shifts, and dim edges — check your monitor's brightness and color uniformity corner to corner.

Test an OLED, AMOLED, or LCD screen for burn-in and image retention with full-screen solid colors, then run a pixel refresher to help reduce temporary retention.

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.

Drag a patch of fast-flashing color noise over a stuck pixel to exercise it back to life — the browser-based pixel-repair method, no install required.

Fill your screen with pure black to reveal backlight bleed, corner glow, IPS glow, and clouding around the edges of an LCD panel. Best in a dark room.

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.

Mark the exact center of your screen with a full-screen crosshair, center lines, corner-to-corner diagonals, and a rule-of-thirds grid — for webcam alignment, mounting, and crosshair reference.

Fill your whole screen with any solid color — presets or a custom hex — for spotting dead and stuck pixels, checking backlight bleed, screen cleaning, bias lighting, and photo backgrounds.

See your browser's live viewport size in CSS pixels, plus device pixel ratio, orientation, and the active responsive breakpoint — resize and watch it update, with a draggable test panel.

Calculate the aspect ratio from any width and height, or lock a ratio like 16:9, 4:3, or 21:9 and solve the missing dimension, with a live preview.

Calculate pixel density (PPI), dot pitch, aspect ratio, and physical screen size from your resolution and diagonal, with presets for common displays.

Find out whether a display is 'retina' for a given size, resolution, and viewing distance — the pixels per degree your eye can resolve, plus the PPI needed at your distance.

Find the ideal viewing distance for your screen size and resolution — where you stop seeing pixels and get full detail, with a recommended range and field of view.

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.

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.

Diagnose scroll wheel jitter, reverse scrolling, and skipping. Scroll one direction for a timed run and get your scroll speed, up/down counts, reverse-jitter detection, and a wheel-health verdict.

Measure your mouse's real DPI in the browser. Enter your configured DPI and a distance, slide your mouse that far along a ruler, and get your true DPI, the pixel counts, and the deviation from the box claim.

Test your mouse for double-click misfires from a worn switch — click and see the interval between clicks, with unintended double-clicks flagged and counted.

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

Test your mouse for drag interruptions — hold and drag across the pad and catch any button drops mid-drag from a failing switch, with the drag path drawn live.

Check your mouse for sensor drift and jitter — hold the mouse still and see whether the pointer reports movement it shouldn't, with any stray motion measured.

Measure your mouse and system input latency — react to an on-screen change and see the delay in milliseconds, averaged over several tries.

Measure your pointer speed and detect mouse acceleration — move the mouse and see whether the same physical motion travels different on-screen distances at different speeds.

Spin your mouse in circles and count full rotations and spin speed — the mouse spinner challenge, measured live.

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

Calculate your eDPI (effective DPI) from your mouse DPI and in-game sensitivity, and compare it across games and pro players.

Convert your mouse sensitivity between games — keep the same cm/360 from CS to Valorant, Apex, Fortnite, and more, using your DPI.

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.

Count every key you press with no time limit — an online keystroke counter that shows your total keys, the last key pressed, and your keys per second (KPS) live, peak, and average. Pause any time and reset for a fresh count.

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.

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.

Measure your keyboard latency in milliseconds. Press keys and see how fast each keystroke reaches the browser, with a live readout, best, average, max, jitter, and a latency histogram.

Test your keyboard for ghosting and check its key rollover (NKRO). Press and hold several keys at once — every key that registers lights up, and the highest simultaneous count is your effective rollover. Windows and Mac layouts.

Test your keyboard for chattering keys that type one press twice. Press a suspect key and see the interval between repeats, with misfires too fast to be human flagged and counted per key.

Test your keyboard's repeat rate in hertz — hold any key and a live meter times the auto-repeat stream, with your max and average rate, the repeat interval, and the initial delay before repeating starts.

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.

Test the combined latency of your display, input device, and reaction time with a simple click-on-change test.

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 you can right-click in clicks per second (CPS). Same timed test as the CPS test, but it counts only right mouse button clicks — pick 1 to 100 seconds.

Measure your actions per minute with a reflex grid — hit each tile the moment it lights up. The RTS benchmark for mechanical speed, with live, peak, and average APM plus accuracy across 3×3, 4×4, and 5×5 grids.

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.

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 how many simultaneous touch points your phone or tablet screen can track. Each finger gets a numbered circle, with live and peak counters — most modern screens track 10.

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 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 accelerometer of a phone or tablet in the browser. Live X, Y and Z readings in m/s², a g-force meter, and a shake counter show whether the motion sensor responds on every axis.

Test the vibration motor of an Android phone or tablet in the browser. Trigger a single buzz, play patterns like pulse, heartbeat, and SOS, or build a custom rhythm — if the phone buzzes along, the motor works.

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.

Test your headphones or speakers across the full audio spectrum. Play pure sine tones from 20 Hz to 20 kHz with a slider, presets, and a full sweep — hear exactly where your gear rolls off, distorts, or goes silent.

Test how deep your subwoofer, speakers, or headphones really go. Play pure sine tones from 20 to 200 Hz — tap a preset, fine-tune with the slider, or sweep the whole bass range and note exactly where your low end stops.

Test every speaker in a stereo, 5.1, or 7.1 setup. Click a speaker on the room map to play a tone on that channel alone, sweep through all channels automatically, and check the subwoofer with a 30–120 Hz bass sweep.

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.

Convert RAM speed and CAS latency into true latency in nanoseconds — compare DDR4 and DDR5 kits fairly, see bandwidth and cycle time, and check whether a memory upgrade is actually faster.