#3F3F66

#3F3F66

Color Values

HEX

#3F3F66

RGB

63, 63, 102

HSL

240.0, 23.6%, 32.4%

HSV

240.0, 38.2%, 40.0%

CMYK

38.2%, 38.2%, 0.0%, 60.0%

OKLCH

0.386 0.0657 282.9

Properties

Cool Dark Nearest: RAL 5000 Violet Blue

Color Harmonies

Complementary

#3F3F66

#66663F

Analogous

#3F5366

#533F66

#3F3F66

Triadic

#3F3F66

#663F3F

#3F663F

Split Complementary

#3F3F66

#66533F

#53663F

Tetradic

#3F3F66

#663F53

#66663F

#3F6653

Color Blindness Simulation

Original

#3F3F66

Protanopia

#3F3F5D

Deuteranopia

#3F3F5A

Tritanopia

#3F5553

Achromatopsia

#424242

CSS Usage

background-color: #3F3F66;
color: #3F3F66;
border-color: #3F3F66;
Nearest Tailwind: Slate 700 #334155

Tailwind Shades

50
#F6F6F9
100
#EAEAF1
200
#D3D3E4
300
#B3B3D0
400
#8A8AB7
500
#61619E
600
#4E4E7E
700
#3E3E65
800
#31314F
900
#26263B
950
#181825

Contrast Checker

Text on white

9.93:1

AA Pass AAA Pass

Text on black

2.11:1

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