Ultramarine

#281bb3

Color Harmonies

Mathematical Matches
Monochromatic
#5c4fe5#3323de#281bb3#1e1487#140e5a
Analogous
#1b5ab3#281bb3#741bb3
Complementary
#281bb3#a6b31b
Split-Complementary
#281bb3#b3741b#5ab31b
Triadic
#281bb3#b3281b#1bb328
Tetradic (Double Complementary)
#281bb3#b31b5a#a6b31b#1bb374

Readability & Contrast

Accessibility Audit & WCAG Compliance

Use Case: Standard White Text

White Text

AAA PASS
The Future
is Color.
Contrast Ratio11.06:1
Use Case: Standard Black Text

Black Text

FAIL
The Future
is Color.
Contrast Ratio1.89:1
Optimized AAA Text

Suggested Text

AAA PASS
The Future
is Color.
Contrast Ratio7.23:1
Recommended Monochrome
#d0ccfc
Optimized AAA Background

Suggested Background

AAA PASS
The Future
is Color.
Contrast Ratio7.17:1
Suggested Complement
#c9db0d

Vision Deficiency Simulations

Protanopia

Red Blind

Deuteranopia

Green Blind

Tritanopia

Blue Blind

Achromatopsia

Total Color Blind

Developer Tools

Ready-to-use snippets for your codebase.

Closest Standard Class

bg-indigo-800Approx

Arbitrary Value (JIT)

<div class="bg-[#281bb3] text-white">
  <!-- Your Content -->
</div>

tailwind.config.js

// tailwind.config.js
module.exports = {
  theme: {
    extend: {
      colors: {
        'brand': '#281bb3',
      }
    }
  }
}