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Contrast Vision

Real-text WCAG and APCA contrast + colorblindness simulation on the page.

chromeedgebraveoperafirefox🔒 Zero telemetryVersion 1.0.0
Download the extension for ChromeDownload the extension for Firefox

Description

Contrast Vision measures text contrast as actually rendered: click an element and it computes the effective colors (compositing transparent backgrounds up the ancestor chain), then shows the WCAG 2.1 ratio with AA/AAA verdicts for normal and large text, plus the APCA Lc value. One click also simulates protanopia, deuteranopia and tritanopia across the whole page via an SVG filter. A manual HEX input always works, even on browser system pages. 100% offline, zero telemetry, minimal permissions (activeTab on demand only).

Features

  • Pick the effective text colors by clicking an element on the page (transparent backgrounds composited)
  • WCAG 2.1 contrast ratio with AA/AAA verdicts for normal and large text
  • Perceptual APCA (Lc) contrast with indicative typographic-use guidance
  • Automatic large-text detection (font size and weight)
  • Whole-page colorblindness simulation: protanopia, deuteranopia, tritanopia
  • Manual HEX input for text and background, works even on system pages
  • 100% offline, no data leaves the browser, minimal permissions (activeTab)

Privacy

100% local processing in your browser. Zero telemetry: no data is sent to external servers.

Required permissions

  • activeTab
  • scripting

Screenshots

Contrast Vision

Supported browsers

chromeedgebraveoperafirefox