How to Check Color Contrast
1
Select Colors
Choose your foreground and background colors using the picker or paste HEX/RGB values.
2
Review Contrast Ratio
See instant feedback on WCAG 2.1 (AA/AAA) and APCA compliance with detailed ratios.
3
Adjust & Pass
Fine-tune colors until they meet accessibility standards for text, UI, and graphics.
Accessibility Features
WCAG 2.1 Testing
Full support for AA and AAA compliance levels. Test for normal and large text requirements.
APCA Algorithm
Advanced Perceptual Contrast Algorithm for modern accessibility testing.
Color Blindness Simulator
Preview how colors appear to users with different types of color vision deficiency.
Real-time Feedback
Instant pass/fail indicators as you adjust colors. No waiting, no guesswork.
Contrast FAQ
What is WCAG 2.1 compliance?
WCAG 2.1 (Web Content Accessibility Guidelines) defines contrast ratios: 4.5:1 for AA normal text, 3:1 for AA large text, 7:1 for AAA normal text, and 4.5:1 for AAA large text.
What is APCA?
APCA (Advanced Perceptual Contrast Algorithm) is a modern contrast method that better reflects human vision. It's part of WCAG 3 development.
Why does accessibility matter?
Accessible design ensures everyone can use your website, including users with visual impairments. It's also required by law in many jurisdictions (ADA, Section 508, European Accessibility Act).