Checking Contrast With Free Tools
Measure real colors before you ship them.
Checking Contrast With Free Tools is a free Web Accessibility Academy lesson on CoddyKit — lesson 4 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Web Accessibility Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.
Stop Guessing, Start Measuring
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
The WebAIM Contrast Checker is the classic. Paste a foreground and background color and it shows the ratio plus AA and AAA pass marks.
Read the Pass and Fail
Good tools label each result Pass or Fail for normal and large text separately, so you know exactly which threshold you cleared.
Built Into Chrome DevTools
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.
Inspect Real Rendered Colors
DevTools reads the computed color and background as actually rendered, so you test the real pixels, not the value you hoped for.
Whole-Page Scans With axe
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.
Pick Colors From the Screen
Many checkers include an eyedropper, so you can sample colors straight off a live site or mockup without hunting for hex codes.
Design Tools Have It Too
Figma and similar apps add contrast plugins, so you can catch failures during design, long before code is ever written.
Watch Out for Gradients
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.
Fix It in the Tool
Most checkers let you nudge a color until it passes, giving you a compliant hex you can paste straight back into your CSS.
Test the Colors You Use
Feed the exact hex values from your stylesheet into a checker to confirm this pairing clears 4.5:1 before you ship.
p {
color: #767676;
background: #ffffff;
}Quick Check
Choose where to test contrast without leaving the browser.
Recap: Measure Before You Ship
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. ✅
Frequently asked questions
Is the “Checking Contrast With Free Tools” lesson free?
Yes — the full text of “Checking Contrast With Free Tools” is free to read here on the web, and the Web Accessibility Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Web Accessibility Academy course, upgrade to CoddyKit PRO.
What will I learn in “Checking Contrast With Free Tools”?
Measure real colors before you ship them. You practise Web Accessibility Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Web Accessibility Academy?
No prior experience is required. Web Accessibility Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 4 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “Checking Contrast With Free Tools” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Web Accessibility Academy lesson?
Yes. Every Web Accessibility Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- Why Contrast Ratios Exist
- Hitting AA: Text and Large Text Thresholds
- Never Rely on Color Alone
- Checking Contrast With Free Tools