the fourth wing
Critique
the textbook turns diagnostic
Drop a screenshot. The browser reads it back through every pixel-level principle it can measure — contrast ratios, color independence under simulated color vision deficiency, information density, element count, banner-shaped regions that users will skip reflexively. Five lenses run in the browser without leaving the page. The native app adds nineteen more through Apple Vision and a local LLM. Your image never leaves the device — not the browser tab, not the machine.
Phone edition: same five lenses, same local analysis. Nothing uploaded.
Drop a screenshot to critique.
PNG, JPEG, or WebP. Analyzed in-browser — nothing leaves this tab.
Five pixel-level lenses: Contrast, Color Independence, Information Density, Occam's count, Banner Blindness. The native Mac app runs twenty-four.