Compare · Observe · Record

Find what changes on your screen

Start with a symptom, compare one change, and keep a record you can explain. Use the patterns below, then bring your observations, settings, and photos together in a private support report.

No install or account. Saved observations stay in this browser; you choose what to export.

Not sure whether the monitor or computer is responsible?

Common display problems

What are you seeing?

Choose a comparison that can change your next step. You do not need to complete every test.

A dot stays in one place

Change solid colors, then move the content. Record the location and backgrounds that reveal the point.

Compare colors and position

A corner glows in dark scenes

Compare the centered view with a small change in head position at the same brightness. Check ordinary content too.

Compare position and lighting

Letters are soft or have colored edges

Keep one text reference fixed while changing app, zoom, or scale. Find which change actually follows the blur.

Compare the same text

Moving objects leave a trail

Keep pattern speed and refresh rate fixed while comparing overdrive settings. Record a dark trail, bright halo, or blur.

Compare motion settings

An old shape remains visible

Look on plain backgrounds and then normal content. Record where the shape persists without calling it permanent.

Compare plain backgrounds

A smooth shade breaks into bands

Compare a 256-value reference with deliberately stepped source images. Download the same PNG to check another viewer.

Separate source steps from screen behavior

Browse all screen checks and references

Full screen-check directory

For a specific setup question, choose a tool below. The inspection guide explains how to compare and interpret a finding.

HDR and color behavior

HDR Capability Check

Check browser HDR capability, verify your setup, and optionally compare SDR patterns.

Gradient Banding Test

Compare known gray values and download the same source image for another viewer.

Gamma Test

Compare browser gamma patterns before changing display settings.

Black and White Detail Check

Inspect shadow detail, highlight detail, and visible clipping.

Color Temperature Test

Keep the same white reference while comparing one display setting and returning to baseline.

Pixels, uniformity, and panel defects

Dead Pixel Test

Use solid colors to locate pixels that remain dark, bright, or fixed.

Touch Screen Test

Trace the display to reveal areas where pointer input repeatedly drops out.

Uniformity Test

Compare visible brightness and color consistency across the panel.

Burn-in Test

Inspect solid colors and patterns for retention-like artifacts.

Backlight Bleed Test

Observe edge light and corner glow on a dark fullscreen pattern.

Viewing Angle Test

Observe color and contrast changes from off-center positions.

Motion, frame timing, and interaction

Response Time Test

Look for ghosting, overshoot, and motion blur in moving patterns.

Refresh Rate Test

Record browser frame cadence and compare it with the configured refresh rate.

Frame Skipping Test

Photograph a short numbered trail and compare repeated internal gaps without wrapping the sequence.

Browser Reaction Time Check

Compare browser reaction timing across repeated pointer or keyboard trials.

Flicker Test

Use a phone camera to compare visible bands or pulsing.

Text and viewing comfort

Text Clarity Test

Compare font readability, fringing, and stroke appearance.

Viewing Distance Calculator

Compare desk distance and viewing angle with a transparent screen-geometry calculation.

Screen information and multi-display setup

Screen Info

Read browser-visible resolution, pixel ratio, and display capability signals.

Multi-Screen Alignment

Compare visible alignment and relative color across displays.

Worked explanations

Three differences worth checking

More pixels, same workspace. 3840 × 2160 at 150% scaling works out to the same 2560 × 1440 logical area as QHD at 100%. Density and room for windows answer different questions. Compare all four setups and download the calculations.

Same average fps, different gaps. Twelve new frames in 200 ms averages 60 fps whether intervals are even or include two 50 ms waits. Read the authored timing diagram before treating a delivery hitch as a pixel-response problem.

Same words, different source detail. Enlarging a 120 × 40 image to 360 × 120 CSS pixels gives existing samples more space; it does not add the missing letter detail. Compare the raster with live text to see why changing the monitor may not address a soft source.

These are calculations and constructed examples, not measurements of your display. For physical observations, keep conditions fixed and use the inspection workflow.

Practical guides

Turn an observation into a next step

Browse all guides