Why does the 1px pixel grid look like wavy bands instead of solid grey?

You are not running at the panel native resolution, your OS scaling is set to a fractional value (125% or 150%), or your browser zoom is not 100%. Each of those breaks the 1:1 mapping between drawn pixels and physical pixels, which is why the grid moires. Set browser zoom to 100% (Ctrl+0), use a round OS scaling value (100% or 200%), and confirm you are at native resolution.

What is the correct "Sharpness" setting on my monitor?

Neutral. Most monitors have a 0-100 sharpness slider where 0 or 5 is the neutral pass-through value and anything higher applies edge enhancement that creates halos around text. Use this test to find the value where the 1px checker patterns look uniform mid-grey at arm length and text edges have no halo - that is neutral.

Why do I see red and blue halos around text on my OLED monitor?

OLEDs often use a non-standard sub-pixel layout (PenTile, RWBG, or QD-OLED triangular) instead of the RGB stripe LCDs use. Sub-pixel font anti-aliasing (ClearType on Windows, sub-pixel rendering on Linux) is tuned for RGB stripe and produces visible color fringing on these panels. The fix is to disable sub-pixel rendering and use grayscale anti-aliasing only - macOS does this automatically on Retina, Windows requires re-tuning ClearType.

Does this replace the Lagom LCD sharpness test?

It serves the same purpose. Lagom is a static image with a single sharpness pattern; this tool draws the patterns dynamically at your device pixel ratio so they remain pixel-perfect on HiDPI displays where a static image would be upscaled. It also adds multi-size text samples, color fringing blocks, and a sub-pixel ruler that the original Lagom page does not include.

تشخيص الشاشة

اختبار حدة الشاشة المجاني - وضوح النص عبر الانترنت

يعرض شبكة 1 بكسل بأسلوب Lagom وعينات نصية بخطوط مختلفة وكتل تحلل الالوان ومسطرة RGB للبكسلات الفرعية لتقييم حدة شاشتك.

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اختبار حدة الشاشة

Lagom-style sharpness patterns

Each block is a 1px alternating black/white grid drawn at the device pixel ratio. On a correctly-scaled monitor with neutral sharpness, every block should look like a uniform mid-grey at arm's length. Visible banding, moire, or shimmer means OS scaling, monitor over-sharpening, or a non-native resolution is interfering with pixel-perfect rendering.

Text clarity at 8 sizes × 3 fonts

Read each block. Small text should remain crisp, not fuzzy. The same paragraph is rendered in serif, sans, and monospace at 12-64 px so you can compare hinting, stem thickness, and grayscale anti-aliasing.

Color fringing detection

Look at the edges of each character. If you see thin red, green, or blue halos along letter strokes, that is chromatic aberration from sub-pixel anti-aliasing on a non-RGB-stripe panel (e.g. RWBG, BGR, OLED PenTile). Black-on-white and white-on-black often render with different sub-pixel hinting.

16px black on white

The quick brown fox jumps over the lazy dog. 0123456789

Sharpness

16px white on black

The quick brown fox jumps over the lazy dog. 0123456789

Sharpness

Aa Bb 0123

Sub-pixel layout ruler

A 1px wide repeating pattern of pure red, green, blue, and black columns. Lean in close (or use a phone camera macro). On a standard RGB-stripe LCD you should see a clean R-G-B-K stripe; on a BGR panel the order reverses; OLEDs with PenTile arrangement will look mottled. This tells you the pixel layout your monitor uses for sub-pixel anti-aliasing.

Denser RGB+black:

Solid R/G/B reference (helps identify a stuck pixel within a column):

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اختبار حدة الشاشة المجاني - وضوح النص عبر الانترنت

اختبار حدة الشاشة

Lagom-style sharpness patterns

Text clarity at 8 sizes × 3 fonts

Color fringing detection

Sub-pixel layout ruler

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