Know what your devices can do.

Check colors, contrast, gradients and fullscreen patterns.

Use clean color fields to inspect your display for stuck pixels.

Review gradients, color separation and contrast patterns.

Estimate the refresh cadence your browser can observe.

Measure latency, download, upload and jitter from your browser.

Preview your camera without uploading any video.

Check microphone access and live input level locally.

Play a short local test tone through your selected output.

Press keys to verify your keyboard is detected.

Check pointer movement, clicks and wheel input.

See active touch points on supported devices.

View viewport size, display resolution and pixel ratio.

Inspect browser capabilities and safe device details.

Check browser location permission without saving coordinates.

Test orientation and motion sensors on compatible devices.

Verify hardware-accelerated graphics support.