#42378A

#42378A

Color Values

HEX

#42378A

RGB

66, 55, 138

HSL

248.0, 43.0%, 37.8%

HSV

248.0, 60.1%, 54.1%

CMYK

52.2%, 60.1%, 0.0%, 45.9%

OKLCH

0.3971 0.1328 284.6

Properties

Cool Dark Nearest: slateblue 4

Color Harmonies

Complementary

#42378A

#7F8A37

Analogous

#37558A

#6B378A

#42378A

Triadic

#42378A

#8A4237

#378A42

Split Complementary

#42378A

#8A6B37

#558A37

Tetradic

#42378A

#8A3755

#7F8A37

#378A6B

Color Blindness Simulation

Original

#42378A

Protanopia

#3D3D76

Deuteranopia

#3E3F71

Tritanopia

#416663

Achromatopsia

#3F3F3F

CSS Usage

background-color: #42378A;
color: #42378A;
border-color: #42378A;
Nearest Tailwind: Indigo 900 #312E81

Tailwind Shades

50
#F5F5FA
100
#E8E7F4
200
#D0CCEB
300
#AFA7DC
400
#8378C9
500
#5749B6
600
#463A92
700
#382F75
800
#2C245B
900
#231E43
950
#16132A

Contrast Checker

Text on white

9.79:1

AA Pass AAA Pass

Text on black

2.15:1

AA Fail AAA Fail

Related Articles

Tutorials

CSS color-mix(): Blend Colors Natively in the Browser

Jan 26, 2026
Tutorials

Building a Color Picker Web Component from Scratch

Jan 21, 2026
Tutorials

Perceptual Color Spaces: Lab, LCH, Oklab, OKLCH

Jan 15, 2026