NEOKYRU
NEOKYRU Free Online Tools
Design & Color Tools
100% Client-Side 100% client-side privacy. All calculations and styling execute locally in your browser with zero server uploads.

Contrast Checker

Calculate color contrast ratio between text and background with live preview

WCAG 2.1 & 2.2 Accessibility Engine

17.06 : 1

Grade: AAA

Standard guidelines require at least 4.5:1 for regular text (AA) and 7.0:1 for enhanced readability (AAA).

Try Presets:
Normal Text (AA)
Minimum 4.5:1
Body copy & standard inputs
✓ PASS
Normal Text (AAA)
Minimum 7.0:1
Enhanced accessibility rating
✓ PASS
Large Text (AA)
Minimum 3.0:1
18pt (24px) or 14pt (18.5px) bold
✓ PASS
Large Text (AAA)
Minimum 4.5:1
18pt or 14pt bold enhanced
✓ PASS
UI Components
Minimum 3.0:1
Buttons, borders, icons, controls
✓ PASS

Live Interface Readability Simulation

Design Systems with Accessible Color Contrast

This preview reflects your exact foreground and background colors in real time.

Color contrast measures the difference in perceived luminance between two colors. High contrast ensures content is legible for people with moderate low vision or color deficiencies without relying on assistive technology.

Interactive Pill Badge

About Contrast Checker

High-precision color contrast ratio calculator between foreground and background colors with simulated website UI, font weight testing, and one-click color swap.

Key Capabilities & Features

  • Calculates precise relative luminance and WCAG contrast ratio (up to 21:1)
  • Interactive color swap button to test background/foreground inversion
  • Curated high-contrast aesthetic color presets for quick testing
  • Live interface mockup card demonstrating headings, body paragraphs, and buttons
  • One-click auto-fix button that computes the closest accessible color shade
  • 100% client-side with zero cloud uploads or tracking

How to Use Contrast Checker

1

Select Foreground & Background

Enter hex codes or use the color pickers for text and background.

2

Check Contrast Ratio

Observe the computed ratio (e.g. 7.5:1) and overall compliance grade.

3

Auto-Fix if Needed

If contrast fails, click 'Auto-Fix to AA' to automatically adjust the foreground shade.

Privacy & In-Browser Execution Guarantee

100% client-side privacy. All calculations and styling execute locally in your browser with zero server uploads.

Frequently Asked Questions

What is considered a good contrast ratio?

A contrast ratio of 4.5:1 or higher is considered accessible for standard body text according to WCAG Level AA standards. For enhanced readability (AAA), a ratio of 7.0:1 or higher is recommended.

Related Tools in this Suite

WCAG Contrast Checker
Verify WCAG 2.1 & 2.2 accessibility compliance for AA and AAA standards
Color Blindness Simulator
Simulate color perception for Protanopia, Deuteranopia, Tritanopia, and Achromatopsia
Color Picker
Pick, inspect, and copy HEX, RGB, HSL, and CMYK color codes instantly
CSS Button Generator
Design interactive UI buttons with gradients, hover states, and shadows