#403739

#403739

Color Values

HEX

#403739

RGB

64, 55, 57

HSL

346.7, 7.6%, 23.3%

HSV

346.7, 14.1%, 25.1%

CMYK

0.0%, 14.1%, 10.9%, 74.9%

OKLCH

0.347 0.0131 2.7

Properties

Warm Dark Nearest: RAL 8019 Grey Brown

Color Harmonies

Complementary

#403739

#37403E

Analogous

#40373D

#403937

#403739

Triadic

#403739

#394037

#373940

Split Complementary

#403739

#374039

#373D40

Tetradic

#403739

#3D4037

#37403E

#393740

Color Blindness Simulation

Original

#403739

Protanopia

#3C3C39

Deuteranopia

#3D3D38

Tritanopia

#403838

Achromatopsia

#393939

CSS Usage

background-color: #403739;
color: #403739;
border-color: #403739;
Nearest Tailwind: Neutral 700 #404040

Tailwind Shades

50
#F8F7F7
100
#EEECED
200
#DED9DA
300
#C6BDBF
400
#A8999D
500
#89767A
600
#6E5E62
700
#584B4E
800
#453B3D
900
#342D2F
950
#211D1D

Contrast Checker

Text on white

11.52:1

AA Pass AAA Pass

Text on black

1.82:1

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