#3F555B

#3F555B

Color Values

HEX

#3F555B

RGB

63, 85, 91

HSL

192.9, 18.2%, 30.2%

HSV

192.9, 30.8%, 35.7%

CMYK

30.8%, 6.6%, 0.0%, 64.3%

OKLCH

0.4337 0.0286 216.3

Properties

Cool Dark Nearest: darkslategrey

Color Harmonies

Complementary

#3F555B

#5B453F

Analogous

#3F5B53

#3F475B

#3F555B

Triadic

#3F555B

#5B3F55

#555B3F

Split Complementary

#3F555B

#5B3F47

#5B533F

Tetradic

#3F555B

#533F5B

#5B453F

#475B3F

Color Blindness Simulation

Original

#3F555B

Protanopia

#49495A

Deuteranopia

#474659

Tritanopia

#405858

Achromatopsia

#515151

CSS Usage

background-color: #3F555B;
color: #3F555B;
border-color: #3F555B;
Nearest Tailwind: Gray 600 #4B5563

Tailwind Shades

50
#F6F8F9
100
#EAEFF0
200
#D5DFE2
300
#B7C8CD
400
#8FAAB2
500
#688D97
600
#537179
700
#435A60
800
#34464B
900
#293538
950
#1A2124

Contrast Checker

Text on white

7.89:1

AA Pass AAA Pass

Text on black

2.66:1

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