Honest, technical answers explaining what browser-based tests can inspect, what they cannot measure, and how to get the most accurate results.
No. A web browser has no optical sensor or camera to inspect physical hardware subpixels. Instead, Monitor Tester renders edge-to-edge, single-wavelength primary color fields (red, green, blue, black, white, magenta, cyan, yellow) allowing the human eye to immediately identify dark (dead) or permanently bright (stuck) subpixels with 100% precision.
Yes. Monitor Tester is built entirely on standard Web APIs (Canvas, requestAnimationFrame, Fullscreen API, MatchMedia) and runs in any modern HTML5 browser on Windows, macOS, ChromeOS, Linux, Android, and iOS. When testing TVs via HDMI, ensure your TV's picture aspect ratio is set to 'Just Scan' / 1:1 and picture mode is set to 'PC' or 'Game' to avoid overscan cropping or heavy sharpening post-processing.
