#1F183D

#1F183D

Color Values

HEX

#1F183D

RGB

31, 24, 61

HSL

251.4, 43.5%, 16.7%

HSV

251.4, 60.7%, 23.9%

CMYK

49.2%, 60.7%, 0.0%, 76.1%

OKLCH

0.24 0.0682 288.9

Properties

Cool Dark Nearest: RAL 5002 Ultramarine Blue

Color Harmonies

Complementary

#1F183D

#363D18

Analogous

#18243D

#32183D

#1F183D

Triadic

#1F183D

#3D1F18

#183D1F

Split Complementary

#1F183D

#3D3218

#243D18

Tetradic

#1F183D

#3D1824

#363D18

#183D32

Color Blindness Simulation

Original

#1F183D

Protanopia

#1C1C34

Deuteranopia

#1C1D32

Tritanopia

#1F2D2B

Achromatopsia

#1C1C1C

CSS Usage

background-color: #1F183D;
color: #1F183D;
border-color: #1F183D;
Nearest Tailwind: Indigo 950 #1E1B4B

Tailwind Shades

50
#F6F5FA
100
#E9E7F4
200
#D2CCEB
300
#B1A7DC
400
#8778CA
500
#5D48B7
600
#4A3A92
700
#3C2E75
800
#2F245B
900
#251D43
950
#17132B

Contrast Checker

Text on white

16.72:1

AA Pass AAA Pass

Text on black

1.26:1

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