Monitor pattern suite
Inspect gradients, color fields, uniformity and backlight behavior in one workspace.
Use normal brightness for colors; dim room lighting for black and low-gray fields.
Enable JavaScript to run this interactive test. The guide and methodology below remain available.
How to run this check
Use normal brightness for colors; dim room lighting for black and low-gray fields.
Understand the result
PASS describes a received signal or your recorded observation. WARNING calls for another check. USER REVIEW REQUIRED means a measurement alone cannot decide. An unavailable API or denied permission does not establish hardware failure.
What this cannot tell you
No browser pattern measures calibrated color accuracy, panel luminance or contrast ratio.
If something seems wrong
Disable night-light filters and check the native display mode before comparing patterns.
Find troubleshooting help →Good to know
Is anything uploaded?
Raw diagnostic input and media are processed locally. Results remain in this page’s memory until you download a report or leave. Hosting requests still reach the site host. See the privacy policy.
Does a pass guarantee my hardware is healthy?
No. It records behavior observed in this browser session. Intermittent faults, internal components and operating-system restrictions need further investigation. See our methodology.