Elly's Contrast Checker

About

Elly Contrast Checker is a professional accessibility tool that checks colour contrast ratios against WCAG 2 AA standards — directly in your Chrome side panel.
  
What it does
- Calculates the contrast ratio between any two colours in real time.
- Reports Pass / Fail per WCAG SC 1.4.3 (text) and SC 1.4.11 (non-text and UI components).
- Takes font size and weight into account to apply the correct threshold (4.5:1 for normal text, 3:1 for large text or non-text content).
- Supports foreground transparency: alpha values are correctly composited against the background before the ratio is calculated.
  
Smart suggestions
When a combination fails, the extension suggests passing alternatives by adjusting the foreground lightness, the background lightness, or the alpha value — so you can fix the issue without leaving your workflow.

Built for designers and developers
- Toggle between HEX, RGB and HSL formats on the fly.
- Save your favourite passing combinations for reuse.
- Optional audio feedback for pass and fail results.
- Lives in the Chrome side panel — out of your way, always one click away.
  
Built by Eleven Ways, accessibility specialists based in Belgium.