Contrasta

WCAG & APCA, fully offline

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

Contrasta checks color contrast the moment you pick a color — no account, no internet, no waiting for a web tool to load. Pick a foreground and background with the color picker, hex entry, or a built-in eyedropper that samples a color straight from any photo in your library. Contrasta instantly shows the WCAG 2.x contrast ratio with AA/AAA pass badges for normal text, large text, and UI components, plus a live text preview so you can see exactly how legible your pairing really is. Designers and developers use Contrasta to sanity-check a brand palette before it ships, catch a low-contrast button during a design review, or verify a color pairing meets accessibility guidelines without leaving their phone. Included • Foreground/background color picker, hex entry & photo eyedropper • WCAG contrast ratio with AA/AAA/UI component pass badges • Live text preview at multiple sizes • Swap & shuffle colors • Save up to 3 color pairs Pro (one-time unlock) • APCA Lc score — the modern perceptual contrast metric proposed for WCAG 3 • Simulate protanopia, deuteranopia, tritanopia & achromatopsia • Batch tab — check every saved color pair against WCAG & APCA at once • Unlimited saved color pairs • Export a shareable contrast report Fully offline. Zero tracking. No subscription.

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The developer, 永 张, 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 Not Collected

    The developer does not collect any data from this app.

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    Accessibility

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

    Information

    Seller
    永 张
    Size
    758.8 KB
    Category
    Utilities
    Compatibility
    Requires iOS 26.0 or later.
    • iPhone
      Requires iOS 26.0 or later.
    • Mac
      Requires macOS 26.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 26.0 or later.
    Languages
    English and Simplified Chinese
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    Copyright © 2026 Peter Zhang. All rights reserved.
  • Developer Website
  • Privacy Policy

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