使用免费工具检查对比度

You never have to eyeball contrast. Free tools compute the exact ratio from two colors and tell you instantly if it passes.

The WebAIM Contrast Checker is the classic. Paste a foreground and background color and it shows the ratio plus AA and AAA pass marks.

Good tools label each result Pass or Fail for normal and large text separately, so you know exactly which threshold you cleared.

Right in the browser, the DevTools color picker shows a live contrast ratio and a line marking the AA cutoff as you adjust a color.

DevTools reads the computed color and background as actually rendered, so you test the real pixels, not the value you hoped for.

Run axe DevTools or Lighthouse to scan an entire page at once. They flag every low-contrast element instead of one pair at a time.

Many checkers include an eyedropper, so you can sample colors straight off a live site or mockup without hunting for hex codes.

Figma and similar apps add contrast plugins, so you can catch failures during design, long before code is ever written.

Tools check one solid pair. Over a gradient or image, test the worst spot by hand, since text contrast can fail in just part of it.

Most checkers let you nudge a color until it passes, giving you a compliant hex you can paste straight back into your CSS.

Feed the exact hex values from your stylesheet into a checker to confirm this pairing clears 4.5:1 before you ship.

Choose where to test contrast without leaving the browser.

You met free tools like WebAIM, DevTools, and axe that turn contrast into a clear pass or fail. Measure real colors and fix failures before launch. ✅