#3F3F99

#3F3F99

Color Values

HEX

#3F3F99

RGB

63, 63, 153

HSL

240.0, 41.7%, 42.4%

HSV

240.0, 58.8%, 60.0%

CMYK

58.8%, 58.8%, 0.0%, 40.0%

OKLCH

0.4214 0.1434 278.3

Properties

Cool Dark Nearest: slateblue 4

Color Harmonies

Complementary

#3F3F99

#99993F

Analogous

#3F6C99

#6C3F99

#3F3F99

Triadic

#3F3F99

#993F3F

#3F993F

Split Complementary

#3F3F99

#996C3F

#6C993F

Tetradic

#3F3F99

#993F6C

#99993F

#3F996C

Color Blindness Simulation

Original

#3F3F99

Protanopia

#3F3F83

Deuteranopia

#3F3F7E

Tritanopia

#3F726E

Achromatopsia

#454545

CSS Usage

background-color: #3F3F99;
color: #3F3F99;
border-color: #3F3F99;
Nearest Tailwind: Indigo 900 #312E81

Tailwind Shades

50
#F5F5FA
100
#E7E7F3
200
#CCCCEA
300
#A8A8DB
400
#7979C8
500
#4A4AB5
600
#3B3B91
700
#303074
800
#25255A
900
#1E1E43
950
#13132A

Contrast Checker

Text on white

8.81:1

AA Pass AAA Pass

Text on black

2.38:1

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