#3F40BC

#3F40BC

Color Values

HEX

#3F40BC

RGB

63, 64, 188

HSL

239.5, 49.8%, 49.2%

HSV

239.5, 66.5%, 73.7%

CMYK

66.5%, 66.0%, 0.0%, 26.3%

OKLCH

0.4531 0.1893 275.4

Properties

Cool Dark Nearest: slateblue 3

Color Harmonies

Complementary

#3F40BC

#BCBB3F

Analogous

#3F7FBC

#7C3FBC

#3F40BC

Triadic

#3F40BC

#BC3F40

#40BC3F

Split Complementary

#3F40BC

#BC7C3F

#7FBC3F

Tetradic

#3F40BC

#BC3F7F

#BCBB3F

#3FBC7C

Color Blindness Simulation

Original

#3F40BC

Protanopia

#3F3F9E

Deuteranopia

#3F3F97

Tritanopia

#3F8681

Achromatopsia

#494949

CSS Usage

background-color: #3F40BC;
color: #3F40BC;
border-color: #3F40BC;
Nearest Tailwind: Indigo 800 #3730A3

Tailwind Shades

50
#F4F4FB
100
#E6E6F5
200
#CACAED
300
#A3A4E0
400
#7272D0
500
#4041BF
600
#333499
700
#292A7A
800
#20215F
900
#1B1B46
950
#11112C

Contrast Checker

Text on white

7.86:1

AA Pass AAA Pass

Text on black

2.67:1

AA Fail AAA Fail

Related Articles

Color Questions

What Is Pantone? The Universal Color Language

Feb 20, 2026
Color Questions

What Is Metamerism? Why Colors Look Different Under Different Lights

Feb 20, 2026
Color Questions

What Is Luminance? Brightness in Color Science

Feb 20, 2026