Test your computer, one part at a time
Pick the part that is giving you trouble, or run the whole check. Every test runs inside this page — nothing is uploaded, nothing is installed.
Start the full checkRuns entirely in your browser
Nothing checked yet
Monitor
- Screen resolution and display detailsSee your real screen resolution, pixel ratio, aspect ratio, colour depth and colour gamut. No install, nothing uploaded.
- Dead pixel testFill your screen with solid colours and find dead, stuck or hot pixels. Runs in the browser, nothing to install.
- Backlight bleed testFill the screen with black and check the edges and corners for light leaking through. Tells backlight bleed apart from normal IPS glow.
- Contrast testTwo ladders of near-black and near-white patches show whether your monitor is crushing shadows or clipping highlights. Free, runs in the browser.
- Colour testSolid colours, stepped grey and RGB ramps to reveal banding, tinting and uneven colour on any screen. Runs in the browser.
- Refresh rate testMeasure the refresh rate your monitor is really running at, plus frame time and skipped frames. No install, results in three seconds.
- Motion blur testA moving pattern at four speeds reveals ghosting, trailing and overshoot on any monitor. Runs in the browser, nothing to install.
- Flicker testFind out whether your monitor backlight is strobing. PWM flicker causes eye strain and headaches long before anyone notices it visually.
- Stuck pixel fixerFlash a movable square of rapidly changing colour over a stuck pixel to try to bring it back. Free, runs in the browser, nothing to install.
Coming soon
- Keyboard
- Mouse
- Microphone
- Headphones and speakers
- Webcam
- System and browser
- Network
- Phone