Testing methodology
Last updated: June 5, 2026
Overview: screenres.app provides browser-based diagnostic utilities and display testing guidelines. All measurements operate completely client-side to ensure user privacy and immediate processing.
What our diagnostic tools measure
Our utilities inspect display properties that are visible to browser engines. These measurements include layout viewports, browser window dimensions, device pixel ratios (DPR), and basic refresh rate intervals. The tools also render solid color blocks and grid lines to help you manually inspect physical panel uniformity, backlight leaks, and stuck pixels.
Capabilities of browser APIs
Browser diagnostic tools rely entirely on client-side JavaScript APIs to query screen properties. We use standard web properties like window.devicePixelRatio and screen.width to fetch your configuration. Frame rate performance checks evaluate rendering times using browser animation timestamps to estimate active display refresh rates.
Limitations of web-based diagnostics
Web-based tools operate in sandboxed browser environments and cannot directly query your monitor hardware or graphics driver settings. For example, our tests cannot verify physical panel response times, color gamut percentages, or backlight bleed levels with absolute certainty. Visual diagnostics depend on the user's eyes to spot physical defects like stuck sub-pixels or panel dust.
Guidelines for safe display testing
Our tools are designed to be safe for display hardware. When testing for stuck pixels or screen uniformity, do not apply physical pressure to the display panel, as this can bruise the liquid crystals. Wipe the monitor surface with a dry microfiber cloth before testing to ensure you do not mistake dust for dead sub-pixels.
Review and updates process
Our editorial team reviews all diagnostic pages, formulas, and guides quarterly. We update our database specifications and tools to reflect recent device releases and web API updates. This validation process ensures that our tools provide reliable estimations according to our editorial policy and tool accuracy and privacy guidelines.