#3F505A

#3F505A

Color Values

HEX

#3F505A

RGB

63, 80, 90

HSL

202.2, 17.6%, 30.0%

HSV

202.2, 30.0%, 35.3%

CMYK

30.0%, 11.1%, 0.0%, 64.7%

OKLCH

0.4207 0.0271 234.1

Properties

Cool Dark Nearest: RAL 7015 Slate Grey

Color Harmonies

Complementary

#3F505A

#5A493F

Analogous

#3F5A56

#3F435A

#3F505A

Triadic

#3F505A

#5A3F50

#505A3F

Split Complementary

#3F505A

#5A3F43

#5A563F

Tetradic

#3F505A

#563F5A

#5A493F

#435A3F

Color Blindness Simulation

Original

#3F505A

Protanopia

#464758

Deuteranopia

#454457

Tritanopia

#405655

Achromatopsia

#4D4D4D

CSS Usage

background-color: #3F505A;
color: #3F505A;
border-color: #3F505A;
Nearest Tailwind: Gray 600 #4B5563

Tailwind Shades

50
#F6F8F8
100
#EAEEF0
200
#D5DDE2
300
#B7C5CD
400
#90A5B1
500
#698596
600
#546B78
700
#435560
800
#35434B
900
#293238
950
#1A2023

Contrast Checker

Text on white

8.38:1

AA Pass AAA Pass

Text on black

2.51:1

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