Accessibility, anywhere on your screen
TheWCAG is a free desktop app for macOS and Windows that checks WCAG color contrast, simulates color blindness, and turns annotated screenshots into shareable accessibility reports.
Contrast anywhere on screen
Pick any two pixels and read the exact WCAG 2.2 ratio, AA/AAA verdict, and APCA - in any app, not just the browser.
Contrast checker →Color-blindness lens
View your UI through protanopia, deuteranopia, tritanopia, and low-acuity vision, live over any window.
Color blindness simulator →Annotate & share
Capture a region, flag issues against WCAG success criteria, and publish an annotated report to a shareable link.
Screenshot tool guide →