#646B87

#646B87

Color Values

HEX

#646B87

RGB

100, 107, 135

HSL

228.0, 14.9%, 46.1%

HSV

228.0, 25.9%, 52.9%

CMYK

25.9%, 20.7%, 0.0%, 47.1%

OKLCH

0.5324 0.0448 273.8

Properties

Cool Dark Nearest: RAL 5014 Pigeon Blue

Color Harmonies

Complementary

#646B87

#878064

Analogous

#647D87

#6F6487

#646B87

Triadic

#646B87

#87646B

#6B8764

Split Complementary

#646B87

#876F64

#7D8764

Tetradic

#646B87

#87647D

#878064

#64876F

Color Blindness Simulation

Original

#646B87

Protanopia

#676780

Deuteranopia

#67667F

Tritanopia

#647B7A

Achromatopsia

#6C6C6C

CSS Usage

background-color: #646B87;
color: #646B87;
border-color: #646B87;
Nearest Tailwind: Slate 500 #64748B

Tailwind Shades

50
#F6F7F8
100
#EBECEF
200
#D6D8E1
300
#B9BCCB
400
#9398AF
500
#6D7492
600
#575D75
700
#454A5E
800
#363A49
900
#2A2D37
950
#1A1C23

Contrast Checker

Text on white

5.26:1

AA Pass AAA Fail

Text on black

3.99:1

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