#3F666B

#3F666B

Color Values

HEX

#3F666B

RGB

63, 102, 107

HSL

186.8, 25.9%, 33.3%

HSV

186.8, 41.1%, 42.0%

CMYK

41.1%, 4.7%, 0.0%, 58.0%

OKLCH

0.4833 0.0447 206.1

Properties

Cool Dark Nearest: RAL 5021 Water Blue

Color Harmonies

Complementary

#3F666B

#6B443F

Analogous

#3F6B5A

#3F506B

#3F666B

Triadic

#3F666B

#6B3F66

#666B3F

Split Complementary

#3F666B

#6B3F50

#6B5A3F

Tetradic

#3F666B

#5A3F6B

#6B443F

#506B3F

Color Blindness Simulation

Original

#3F666B

Protanopia

#50506A

Deuteranopia

#4E4B69

Tritanopia

#416969

Achromatopsia

#5E5E5E

CSS Usage

background-color: #3F666B;
color: #3F666B;
border-color: #3F666B;
Nearest Tailwind: Teal 800 #115E59

Tailwind Shades

50
#F6F9F9
100
#E9F0F1
200
#D2E2E5
300
#B2CED2
400
#88B4B9
500
#5E99A1
600
#4C7A80
700
#3C6267
800
#2F4D50
900
#25393C
950
#172426

Contrast Checker

Text on white

6.32:1

AA Pass AAA Fail

Text on black

3.32:1

AA Fail AAA Fail

Related Articles

Tutorials

Building a Color Picker Web Component from Scratch

Feb 20, 2026
Tutorials

Web Color Performance: Gradients, Shadows, and Filters

Feb 19, 2026
Tutorials

Tailwind CSS Colors: Complete Shade System Guide

Feb 19, 2026