Screenshot contrast
Inspect the interface users actually see, even when the source design or CSS is unavailable.
ContrastRadar · Guides
ContrastRadar Guides
Guides for finding text in screenshots and reviewing rendered contrast with WCAG 2.2 and APCA on Mac.
WCAG and APCA
Understand what each contrast measure says, where it helps, and where judgment is still required.
OCR and evidence
Locate recognized text, review the sampled region, and use confidence information in the final decision.
Latest
Latest articles
Screenshot workflow
How to Check Text Contrast in a Screenshot on Mac
A practical screenshot-review workflow for locating rendered text, checking WCAG contrast, and deciding which results need manual verification.
Read articleContrast standards
WCAG Contrast Ratio vs. APCA: What Changes in a Screenshot Review?
Compare WCAG 2.2 ratios with APCA Lc values, including polarity, text-size assumptions, and what a screenshot cannot establish.
Read articleTroubleshooting
Why Screenshot Contrast Measurements Change Around the Same Text
See how antialiasing, scaling, compression, OCR bounds, and mixed backgrounds can change a contrast estimate without changing the intended design colors.
Read articleComplex backgrounds
How to Review Text Contrast on Image and Gradient Backgrounds
Review text that crosses photographs, gradients, transparency, or shadows without reducing the whole region to one misleading color pair.
Read articleTool comparison
Screenshot Contrast Checker vs. Browser DevTools: Which Should You Use?
Choose a pixel-based screenshot review or a source-aware browser inspection based on the artifact you have and the decision you need to make.
Read article