#403F8F

#403F8F

Color Values

HEX

#403F8F

RGB

64, 63, 143

HSL

240.8, 38.8%, 40.4%

HSV

240.8, 55.9%, 56.1%

CMYK

55.2%, 55.9%, 0.0%, 43.9%

OKLCH

0.4144 0.1289 279.7

Properties

Cool Dark Nearest: slateblue 4

Color Harmonies

Complementary

#403F8F

#8E8F3F

Analogous

#3F668F

#683F8F

#403F8F

Triadic

#403F8F

#8F403F

#3F8F40

Split Complementary

#403F8F

#8F683F

#668F3F

Tetradic

#403F8F

#8F3F66

#8E8F3F

#3F8F68

Color Blindness Simulation

Original

#403F8F

Protanopia

#40407C

Deuteranopia

#404077

Tritanopia

#406C69

Achromatopsia

#454545

CSS Usage

background-color: #403F8F;
color: #403F8F;
border-color: #403F8F;
Nearest Tailwind: Blue 900 #1E3A8A

Tailwind Shades

50
#F5F5FA
100
#E7E7F3
200
#CECDE9
300
#ABAADA
400
#7D7CC5
500
#4F4EB1
600
#3F3E8E
700
#333271
800
#282758
900
#202041
950
#141429

Contrast Checker

Text on white

9.03:1

AA Pass AAA Pass

Text on black

2.33:1

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