#646B5B

#646B5B

Color Values

HEX

#646B5B

RGB

100, 107, 91

HSL

86.3, 8.1%, 38.8%

HSV

86.3, 15.0%, 42.0%

CMYK

6.5%, 0.0%, 15.0%, 58.0%

OKLCH

0.5169 0.026 126.6

Properties

Cool Dark Nearest: RAL 7023 Concrete Grey

Color Harmonies

Complementary

#646B5B

#625B6B

Analogous

#6B6A5B

#5C6B5B

#646B5B

Triadic

#646B5B

#5B646B

#6B5B64

Split Complementary

#646B5B

#5B5C6B

#6A5B6B

Tetradic

#646B5B

#5B6B6A

#625B6B

#6B5B5C

Color Blindness Simulation

Original

#646B5B

Protanopia

#67675F

Deuteranopia

#676660

Tritanopia

#646263

Achromatopsia

#686868

CSS Usage

background-color: #646B5B;
color: #646B5B;
border-color: #646B5B;
Nearest Tailwind: Stone 500 #78716C

Tailwind Shades

50
#F7F8F7
100
#EDEEEC
200
#DCDED8
300
#C2C7BD
400
#A2A899
500
#818A75
600
#676E5E
700
#52584B
800
#40453B
900
#31342D
950
#1F211C

Contrast Checker

Text on white

5.53:1

AA Pass AAA Fail

Text on black

3.8:1

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