Design Inspection
Check whether your primary CTA is visible from likely fixation points. Verify that visual hierarchy survives peripheral degradation — if users have to foveate every element to find what they need, the layout isn't working.
How It Works
Scrutinizer models how spatial resolution, color sensitivity, and visual crowding change with distance from where you're looking.
Cortical magnification
Half the visual cortex processes the central 2° of vision. Resolution drops off with eccentricity following a log-polar mapping. Scrutinizer renders this falloff using hardware MIP-chain pooling — each MIP level halves spatial resolution, approximating how receptive fields grow with distance from fixation.
Chromatic pooling
Color perception narrows in the periphery. S-cones (blue) are sparse outside the fovea, and the parvocellular pathway that carries fine color information loses resolution with eccentricity. Scrutinizer models this as selective chrominance pooling in Oklab color space, preserving luminance structure while color bleeds and shifts.
Visual crowding
In the periphery, objects aren't invisible — they're unidentifiable. Flanking elements merge with targets, making it impossible to isolate individual items. Scrutinizer renders this as position jitter scaled to integration field size, following the Texture Tiling Model (Rosenholtz et al.).
