#428FDB

#428FDB

Color Values

HEX

#428FDB

RGB

66, 143, 219

HSL

209.8, 68.0%, 55.9%

HSV

209.8, 69.9%, 85.9%

CMYK

69.9%, 34.7%, 0.0%, 14.1%

OKLCH

0.6369 0.1375 250.6

Properties

Cool Light Nearest: cornflowerblue

Color Harmonies

Complementary

#428FDB

#DB8E42

Analogous

#42DBDB

#4243DB

#428FDB

Triadic

#428FDB

#DB428F

#8FDB42

Split Complementary

#428FDB

#DB4243

#DBDB42

Tetradic

#428FDB

#DB42DB

#DB8E42

#43DB42

Color Blindness Simulation

Original

#428FDB

Protanopia

#6364C9

Deuteranopia

#5F59C4

Tritanopia

#46BAB7

Achromatopsia

#848484

CSS Usage

background-color: #428FDB;
color: #428FDB;
border-color: #428FDB;
Nearest Tailwind: Sky 600 #0284C7

Tailwind Shades

50
#F3F7FC
100
#E3EDF7
200
#C3DBF4
300
#98C2EB
400
#60A1E1
500
#2980D6
600
#2166AB
700
#1A5289
800
#14406B
900
#13314E
950
#0C1F31

Contrast Checker

Text on white

3.4:1

AA Fail AAA Fail

Text on black

6.18:1

AA Pass 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