Screenshot-first review
Drop in a screenshot or design export. Apple Vision locates text while ContrastRadar estimates foreground and background colors.
ContrastRadar for macOS
macOS 14 or later
Find hard-to-read text before users do.
ContrastRadar recognizes text in screenshots, mockups, and exported images, estimates text-to-background contrast, and brings WCAG 2.2 checks and APCA guidance into one on-device workflow.
Unlimited single-image checks are free · Pro is a one-time purchase
Built for visual review
A number, its location, and the context around it.
Two useful perspectives
Use WCAG 2.2 ratios for established conformance checks and APCA Lc values as polarity-aware perceptual guidance.
Results you can locate
Select a result to find its rectangle in the image, or select a highlighted region to return to the matching result.
Entirely on-device
OCR, color sampling, and contrast calculations run on your Mac. Images are never uploaded for analysis.
Recognize, estimate, review
Move from the whole interface to each text region.
Filter passing, failing, or all results, then use analysis confidence to prioritize manual review. Pro adds sequential batch analysis and PDF or CSV report export.
The details that matter
Standards, confidence, and limitations—made explicit.
- WCAG 2.2 AA thresholds for normal and large text
- APCA Lc values, polarity, and risk guidance
- Recognized text, sampled colors, and worst-case contrast
- Passing, failing, and high-confidence issue filters
- PNG, JPEG, and HEIC images with drag and drop
- Proportional downsampling above a 4096-pixel edge
A transparent method
Know which standards are used—and where judgment still matters.
Your images stay on your Mac
Recognition and calculations happen locally.
No account, advertising, analytics, or tracking. Only the optional Pro purchase is processed by Apple through StoreKit.
Read the privacy policy →