#3F445B

#3F445B

Color Values

HEX

#3F445B

RGB

63, 68, 91

HSL

229.3, 18.2%, 30.2%

HSV

229.3, 30.8%, 35.7%

CMYK

30.8%, 25.3%, 0.0%, 64.3%

OKLCH

0.3917 0.0396 274.9

Properties

Cool Dark Nearest: RAL 7015 Slate Grey

Color Harmonies

Complementary

#3F445B

#5B563F

Analogous

#3F525B

#483F5B

#3F445B

Triadic

#3F445B

#5B3F44

#445B3F

Split Complementary

#3F445B

#5B483F

#525B3F

Tetradic

#3F445B

#5B3F52

#5B563F

#3F5B48

Color Blindness Simulation

Original

#3F445B

Protanopia

#414155

Deuteranopia

#414054

Tritanopia

#3F5150

Achromatopsia

#454545

CSS Usage

background-color: #3F445B;
color: #3F445B;
border-color: #3F445B;
Nearest Tailwind: Slate 700 #334155

Tailwind Shades

50
#F6F7F9
100
#EAEBF0
200
#D5D7E2
300
#B7BBCD
400
#8F96B2
500
#687197
600
#535A79
700
#434860
800
#34384B
900
#292B38
950
#1A1B24

Contrast Checker

Text on white

9.59:1

AA Pass AAA Pass

Text on black

2.19:1

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