Display diagnostics
Fullscreen any color (gray, black, white, or a primary) at any brightness, then look for dark corners, clouded patches, or tint drift across your monitor. Good panels are perfectly even. Poor uniformity shows up instantly at mid gray or near-black.
Primary tool
Pick a color and brightness level, enter fullscreen, and look for dark corners, brighter edges, clouds, or IPS glow on your monitor. Different colors reveal different uniformity issues.
Search Intent Cluster
The same full-screen tester can be used for black-screen, white-screen, dead-pixel, stuck-pixel, and general monitor inspection.
Run the complete browser-based monitor test with full-screen colors and quick inspection tips.
Open pageOpen a clean black screen to inspect backlight bleed, glow, and bright defects.
Open pageUse a full white screen to spot stuck pixels, dust, tint, and uniformity issues.
Open pageUse black, white, and color screens to spot pixels that stay permanently dark.
Open pageCheck for red, green, or blue pixels that stay lit on every screen.
Open pageUse a full-screen dark display with adjustable brightness to inspect for backlight bleed, IPS glow, and clouding.
Open pageCycle full-screen color panels and gradients to check banding, tint, and uniformity.
Open pageDetect limited-vs-full RGB range mistakes that crush shadows or clip highlights.
Open pageMeasure the real browser-visible refresh rate of a monitor in hertz.
Open pageExplore the full suite for keyboard, mouse, audio, and utilities.
Language support: All major tools are available in 8 languages - Arabic, Russian, Spanish, French, Portuguese, Japanese, German, and Korean. Select your language from the header menu to switch.
Test keyboard functionality, detect ghosting, measure latency, check for stuck keys
Test your keyboard Arabic Keyboard TesterTest Arabic keyboard layout and key response in an Arabic-first interface
Test Arabic layout Typing Speed TestMeasure WPM, accuracy, and typing consistency
Check typing speed Latency CheckerTest device and input latency in your browser
Measure latency Spacebar Speed TestCount how many spacebar presses you can make in 5, 10, or 30 seconds
Test your spacebar Key Repeat Rate TesterMeasure your keyboard key repeat rate (Hz) and initial delay (ms) in your browser
Test repeat rate Typing Rhythm FingerprintVisualize your inter-keystroke timing patterns and get a rhythm consistency score
Analyze rhythm Keyboard Switch Sound AnalyzerClassify your mechanical keyboard switches as linear, tactile, or clicky using mic FFT analysis
Analyze sound Keyboard Chatter DetectorFind keys that register twice from a single press with configurable threshold and per-key stats
Detect chatter Keyboard Polling Rate TestEstimate keyboard Hz using browser auto-repeat timing measurement
Test polling rate Keyboard Shortcut IdentifierPress any key combination and instantly see what it does on Windows, macOS and Linux
Try a shortcut Mouse TesterCheck mouse buttons, scroll wheel, cursor movement, and responsiveness
Test your mouse Mouse Speed TesterMeasure your click speed (CPM or CPS) with timed tests
Check click speed Mouse Sensitivity / DPITest DPI, sensitivity, and tracking accuracy
Test DPI settings Mouse TrailVisualize mouse movement trails and precision
View mouse trails Ghost Click DetectorDetect unintended or phantom clicks
Detect ghost clicks Mouse Polling Rate TestCheck if your gaming mouse runs at 125Hz, 500Hz, 1000Hz or higher
Test polling rate Mouse LOD TesterMeasure your gaming mouse lift-off distance to optimize sensor performance
Test LOD Mouse Accuracy TestAim trainer benchmark — measure hit percentage, average pixel error, and reaction time per target
Test your aim Mouse Drag Click TestMeasure drag-click CPS, peak burst rate, and total clicks with live timeline graph
Test drag clicks Right Click CPS TestMeasure right-mouse-button CPS with browser context menu suppressed
Test right CPS Mouse DPI CalculatorMeasure true mouse DPI by dragging a known distance or entering pixel and inch values manually
Measure DPI eDPI CalculatorCalculate effective DPI (DPI x sensitivity) and cm/360 for CS2, Valorant, Apex and other FPS games
Calculate eDPI Mouse Drift TestDetect idle cursor drift and sensor jitter with a 10s-3min pointer-event sampler and pass/fail verdict
Test drift Mouse Acceleration TestCompare slow vs fast swipe pixels to catch Windows pointer acceleration or firmware-level sensor acceleration
Test acceleration Mouse Spin TestCounts full 360° mouse rotations over 15/30/60 s with peak spins-per-second and direction indicator
Start spinning Screen TesterDetect dead, stuck, or hot pixels on screens
Test your screen Monitor Refresh Rate TestDetect if your display runs at 60Hz, 144Hz, 240Hz or higher
Test refresh rate Monitor Color TestCheck color accuracy, gradient banding and backlight uniformity
Test colors Backlight Bleed TestCheck your LCD monitor for backlight bleed, IPS glow, and clouding
Test for bleed Touch Screen TestTest for dead zones, ghost touches and multi-touch on phone or tablet
Test touch screen PWM Flicker TestCheck if your monitor uses PWM backlight dimming that can cause eye strain
Test for flicker Monitor Gamma TestVisual gamma calibration check using stripe-blend pattern, target sRGB 2.2
Test gamma Monitor Ghosting TestDetect pixel response time issues with adjustable-speed moving box on color backgrounds
Test ghosting Black Level TestCheck shadow detail with 32 near-black patches, detect crushed blacks
Test black level White Level TestCheck highlight detail with 32 near-white patches, detect clipped whites
Test white level Brightness Test11-step grayscale ladder to verify brightness, contrast, and gamma calibration
Test brightness Contrast TestCheckerboard vs 50% gray squint test for contrast and gamma calibration
Test contrast PPI CalculatorCompute pixels per inch, dot pitch, aspect ratio and megapixels for any display from resolution + diagonal
Calculate PPI Aspect Ratio CalculatorType any two of width, height, or ratio. Auto-simplifies to lowest integer terms and renders a live preview
Open calculator Screen Size CalculatorCompute diagonal, width, height and visible area from aspect ratio plus any one dimension — in inches and cm
Calculate size Viewing Distance CalculatorOptimal TV/monitor viewing distance by THX (36° FoV), SMPTE (30° FoV), and the 4K/8K resolving-limit
Find distance FPS TestLive frame rate measurement with avg/min/max/1%-low plus 60/120/144/165/240Hz detection
Start FPS test Screen Resolution TestLive readout of screen resolution, native pixels, device pixel ratio, color depth, and gamut
See resolution OLED Burn-In TestCycle 8 solid colors, fine checkerboard, and scrolling refresher fullscreen to detect OLED burn-in
Test burn-in Color Range TestDetect Full RGB (0-255) vs Limited (16-235) via near-black and near-white patch grids
Test RGB range Screen Uniformity TestFullscreen gray/black/white/RGB at any brightness to spot clouding, IPS glow, and backlight bleed
Test uniformity Frame Skipping TestDetects dropped or skipped frames at your refresh rate with rAF timestamp analysis and a visual reference bar
Detect skipped frames Monitor Sharpness TestLagom-style 1px pixel grid, multi-size text samples, color-fringing blocks, and an RGB sub-pixel ruler to evaluate display sharpness
Test sharpness Webcam TesterCheck webcam quality, resolution, and snapshots
Test your webcam Webcam MirrorUse your webcam as a real-time virtual mirror with horizontal flip, brightness/contrast, grid, and snapshot
Open mirror Mic TesterVerify microphone input and audio levels
Test your microphone Headphone / Speaker TesterTest stereo channels and sound output
Test audio output Decibel MeterLive dB SPL measurement using your microphone with peak and rolling average
Open meter Sound TestSpeaker and headphone channel verifier plus 100 Hz → 10 kHz frequency sweep
Test sound Bass TestSubwoofer and low-frequency sweep (20 Hz → 200 Hz) with ISO 1/3-octave bass presets
Test bass Frequency Response TestFull-range 20 Hz → 20 kHz log sweep with hearing-limit logging and manual tone slider
Start hearing test Auditory Reaction Time TestMeasure how fast you respond to a sound cue in milliseconds using the Web Audio API
Start sound test Surround Sound Test5.1 and 7.1 channel walk-around to verify speaker wiring, with stereo panning fallback for headphones
Test surround Pitch DetectorSing or play any note. Get live Hz, nearest note (C0-C8), octave, and cents off perfect pitch
Open pitch detector Hearing Age TestMosquito tone hearing test - 12 frequencies from 8 kHz to 22 kHz to estimate your hearing age
Test hearing age OCR ToolExtract text from images quickly
Extract text now QR Code ReaderScan QR codes with camera or image upload
Scan QR codes QR Code GeneratorCreate custom QR codes instantly
Create QR code Password GeneratorCreate strong, secure passwords instantly
Generate password WhatsApp Link GeneratorCreate clickable WhatsApp chat links
Generate chat link WhatsApp Brand LinksCreate branded WhatsApp links and QR codes
Create brand link WhatsApp Sentiment AnalyzerAnalyze chat sentiment and tone
Analyze sentiment All ToolsBrowse all hardware testing tools in one place
View all tools WebRTC Leak TestDetect IP address leaks through your browser even when using a VPN, IPv4 + IPv6 + local
Check IP leak Accelerometer TestLive X/Y/Z acceleration readout in m/s² with tilt ball, shake counter, and peak-g tracking
Test motion sensor Gyroscope TestLive alpha/beta/gamma rotation readout with 3D cube, compass ring, and calibrate-to-zero
Test rotation sensor Vibration TestPhone haptics patterns (Vibration API) and gamepad rumble per-motor intensity in one tool
Test vibration CPU Stress TestMulti-threaded WebWorker SHA-256 busy loop to load every logical core and report ops per second
Stress the CPU AI GPU TestCheck WebGPU, WebGL2, WebNN and browser AI readiness with a safe matrix compute benchmark
Test AI GPU readiness GPU Stress TestWebGL2 Mandelbrot fragment shader benchmark that pushes any GPU and reports FPS, minimum FPS, and software-rendering fallback
Stress the GPU Memory TestBrowser heap monitor with live performance.memory readout, allocation stressor, and safe auto-abort
Open memory test RAM Latency CalculatorConvert CAS latency (CL) and memory speed (MT/s) to real nanoseconds, compare DDR4 vs DDR5 kits side by side
Calculate RAM latency Bandwidth CalculatorSolve for transfer time, file size, or required speed - handles bits vs bytes math automatically
Open bandwidth calc Download Time CalculatorEstimate download duration for games, movies, and backups at your connection speed with realistic overhead
Estimate download time RAID CalculatorUsable capacity and fault tolerance for RAID 0/1/5/6/10/50/60 with side-by-side level comparison
Calculate RAID Online RulerActual-size cm and inch ruler on screen with credit-card calibration (ISO ID-1) and DPI presets
Open ruler AI AssistantChat with the site's AI helper — it picks the right hardware test, links you to it, and explains the result in 8 languages
Open AI chat Gamepad TesterTest PS5, Xbox, Switch and PC controller buttons, stick drift and triggers
Test controller Reaction Time TestMeasure how fast you react with a browser-based millisecond reflex test
Test reaction time FoV CalculatorConvert field of view across aspect ratios and games with presets for CS2, Valorant, Apex, CoD and Fortnite
Convert FoV Crosshair GeneratorDesign a custom crosshair with live preview, PNG export, CS2 console command, and Valorant settings values
Open generator APM TestActions-per-minute counter for RTS & MOBA players — live APM, peak, and session average
Measure APM Gamertag GeneratorRandom gamer names across 6 styles with length limits for Xbox, PSN, Steam, and Discord
Generate names Guild Name GeneratorRandom MMO guild and clan names across 6 themes and 5 templates, with WoW/FFXIV/Destiny length limits
Generate guild names TTK CalculatorTime-to-kill math for FPS games with body vs head comparison, armor handling, and CS2/Valorant/Apex/CoD presets
Calculate TTK Minecraft Circle GeneratorPixel circle, filled disc, thick ring, and 3D sphere layer plotter for Minecraft builders, radius 1-256
Plot a circleNo tools match that category yet.
A "uniform" display shows the exact same color and brightness across every region of the panel. Real-world LCD and OLED monitors are never perfectly uniform — the backlight (LCD) or pixel-aging pattern (OLED) inevitably introduces small variations. The question for buyers and QC is how big those variations are. Professional color-critical work (photo editing, video grading) demands tight uniformity; gaming and general use tolerates more.
Clouding looks exactly like its name — milky, cloud-shaped patches of brighter or slightly tinted gray visible when displaying a solid mid-gray or dark color. It's most common on VA panels, where slight LCD alignment variations across the panel area produce uneven light transmission. Minor clouding is considered normal; severe clouding is usually a warranty-able defect.
These are different, despite being often confused:
Set a uniform fullscreen color and look carefully. Mid-gray reveals clouding best because grays show the slightest luminance shifts. Near-black reveals bleed and glow because any stray light stands out. Solid primary colors (red, green, blue) reveal subpixel-level issues — a weak blue subpixel cluster, for example, will show as a purple patch on a solid blue field. Testing at multiple brightness levels is important since some issues only appear in specific bands.
How to use each color to find specific panel issues.
