ContrastRadar - Contrast Check

WCAG & APCA for Images

Only for Mac

Free · In‑App Purchases

Mac

Find hard-to-read text in images with local OCR, WCAG 2.2 contrast checks, and APCA guidance—without uploading your files. ContrastRadar helps designers, developers, accessibility specialists, and QA teams review text contrast directly from images. Drop in a screenshot, mockup, or exported design. ContrastRadar recognizes text with Apple Vision, estimates foreground and background colors, and highlights areas that may be difficult to read. KEY FEATURES • WCAG 2.2 contrast evaluation Review normal text against the WCAG AA 4.5:1 threshold and inspect estimated minimum contrast and passing coverage. • APCA guidance See polarity-aware APCA Lc values and perceptual contrast guidance alongside WCAG results. • Fully local processing Images, recognized text, sampled colors, and results stay on your Mac. No account or server upload is required. • Visual review workflow Select a result in the sidebar to locate it in the image, or select a highlighted text region to find its result. • Confidence-aware results Use confidence levels to prioritize manual review when antialiasing, gradients, transparency, compression, or photographic backgrounds affect estimates. • Flexible reporting Filter passing and failing results. ContrastRadar Pro unlocks unlimited sequential batch analysis and PDF/CSV report export with a one-time purchase. ContrastRadar supports PNG, JPEG, HEIC, and other image formats available through macOS. IMPORTANT Image-based contrast analysis is an estimate. OCR boundaries, text size and weight, antialiasing, transparency, gradients, scaling, compression, and complex backgrounds can affect results. APCA is presented as guidance when text size and weight cannot be determined reliably. Review low-confidence results manually.

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The developer, 龙威 刘, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

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    Accessibility

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    Information

    Seller
    • 龙威 刘
    Size
    • 1.6 MB
    Category
    • Utilities
    Compatibility
    Requires macOS 14.0 or later.
    • Mac
      Requires macOS 14.0 or later.
    Languages
    • English and Simplified Chinese
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • © 2026 Longwei Liu
  • Developer Website
  • Privacy Policy