Pixel Contrast Checker

calculation contrast ratio

Free · Designed for iPad

Change the initial selection on the check screen. Compatible with iPad (full screen only). Ensure your designs are accessible and legible for everyone. You can analyze images and URLs.Evaluate the color contrast of your web designs, app UIs, and presentation slides based on the WCAG 2.1 international standards. This app provides instant accessibility checks for Standard Text, Large Text, and UI components. You can analyze images and URLs. ■ Key Features Simple Tap-to-Check Just upload an image and tap two points—the background and the text—to instantly calculate the contrast ratio. You can save up to 5 images within the app for quick reference without re-uploading. You can now display a web page by entering a URL and compare by tapping on the page. 300% Zoom Function Magnify your designs up to 300%. Even on a smartphone screen, you can examine fine details and ensure your work is perfect. Precision Magnifying Glass (Loupe) The built-in magnifying glass appears when you tap, allowing you to target and select specific pixels with pinpoint accuracy—ideal for complex designs or gradients. You can set the magnification of the loupe from 2x to 5x. History Management Save your results with a single tap. View your history of contrast ratios and HEX color codes at a glance. (Note: History is maintained during the current session and resets when the app is closed or a new image is selected.) Full WCAG 2.1 Compliance The app automatically determines if your colors meet the 4.5:1 ratio required for accessibility, making it easy to see if your content is truly readable. ■ Who It’s For Web, UI, and UX Designers App Developers & Front-end Engineers Business professionals creating presentations or flyers Any creator focused on inclusive, accessible design ■ Supported Formats JPEG, PNG, and HEIC High-resolution images up to 4000px Import directly from your Photo Library or Files app ■ Privacy First Your privacy is our priority. All image analysis is performed locally on your device. No data is ever uploaded to external servers.

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Change the initial selection on the check screen. Compatible with iPad (full screen only).

Version 1.4

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

  • Data Used to Track You

    The following data may be used to track you across apps and websites owned by other companies:

    • Identifiers
    • Usage Data
    • Diagnostics

  • Data Linked to You

    The following data may be collected and linked to your identity:

    • Identifiers
    • Usage Data
    • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

  • Seller
    • YONEMASU, K.K.
  • Size
    • 12.2 MB
  • Category
    • Developer Tools
  • Compatibility
    Requires iOS 18.3 or later.
    • iPhone
      Requires iOS 18.3 or later.
    • iPad
      Requires iPadOS 18.3 or later.
    • Mac
      Requires macOS 15.3 or later and a Mac with Apple M1 chip or later.
  • Languages
    • English and Japanese
  • Age Rating
    16+
    • 16+
    • Learn More
    • Contains
      Unrestricted Web Access
      Advertising
  • Copyright
    • © YONEMASU, K.K
  • Developer Website
  • Privacy Policy

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