#2566B3

#2566B3

Color Values

HEX

#2566B3

RGB

37, 102, 179

HSL

212.5, 65.7%, 42.4%

HSV

212.5, 79.3%, 70.2%

CMYK

79.3%, 43.0%, 0.0%, 29.8%

OKLCH

0.5104 0.1383 255.0

Properties

Cool Dark Nearest: NCS S 1060-B Bright Blue

Color Harmonies

Complementary

#2566B3

#B37225

Analogous

#25ADB3

#2B25B3

#2566B3

Triadic

#2566B3

#B32566

#66B325

Split Complementary

#2566B3

#B32B25

#ADB325

Tetradic

#2566B3

#B325AD

#B37225

#25B32B

Color Blindness Simulation

Original

#2566B3

Protanopia

#4142A0

Deuteranopia

#3D389C

Tritanopia

#28928E

Achromatopsia

#5E5E5E

CSS Usage

background-color: #2566B3;
color: #2566B3;
border-color: #2566B3;
Nearest Tailwind: Sky 700 #0369A1

Tailwind Shades

50
#F3F7FC
100
#E3ECF7
200
#C4D9F3
300
#9ABEEA
400
#639BDF
500
#2C79D3
600
#2360A9
700
#1C4D87
800
#163C6A
900
#142E4D
950
#0D1D31

Contrast Checker

Text on white

5.78:1

AA Pass AAA Fail

Text on black

3.63:1

AA Fail AAA Fail

Related Articles

Tutorials

CSS color-mix(): Blend Colors Natively in the Browser

Jan 26, 2026
Tutorials

Building a Color Picker Web Component from Scratch

Jan 21, 2026
Tutorials

Perceptual Color Spaces: Lab, LCH, Oklab, OKLCH

Jan 15, 2026