Blue 900
blue-900 · #1E3A8A
HEX
#1E3A8A
RGB
rgb(30, 58, 138)
CMYK
cmyk(78%, 58%, 0%, 46%)
HSL
hsl(224, 64%, 33%)
LAB
lab(27.1, 20.0, -47.6)
What is Blue 900?
Blue 900 is the blue-900 reference in the Tailwind CSS palette. Its sRGB value is #1E3A8A (rgb 30, 58, 138). It sits in the blue family. The default color palette shipped with Tailwind CSS v3 by Tailwind Labs. 22 color families across 11 lightness steps (50 to 950). See disclaimer for accuracy and trademark notes.
Accessibility
WCAG 2.1 contrast checks for Blue 900 as a background.
Black text on this color
White text on this color
Shades, tints & tonal scale of Blue 900
An 11-step tonal scale derived from Blue 900 (#1E3A8A). Click any swatch to copy its HEX. Use these as a starting point for design tokens, hover states, and disabled states in a design system.
50
#EDEFF6
#EDEFF6
100
#DBDFEC
#DBDFEC
200
#B7C0DA
#B7C0DA
300
#8F9DC5
#8F9DC5
400
#566BA7
#566BA7
500
#1E3A8A
#1E3A8A
600
#1A3175
#1A3175
700
#14265A
#14265A
800
#0E1A3E
#0E1A3E
900
#080F23
#080F23
950
#040711
#040711
Lighter tints (mixed with white)
15%
#7077A3
30%
#979BB8
45%
#B4B7CA
60%
#CCCEDA
75%
#E1E2E9
Darker shades (mixed with black)
15%
#1B3580
30%
#183075
45%
#142A68
60%
#10235A
75%
#0B1A47
Color harmonies for Blue 900
Classic color-theory harmonies derived from rotating the hue of Blue 900. Use these to build accent palettes, brand systems, and accessible UI color pairings.
Complementary
180° opposite — strongest contrast
#1E3A8A
#1E3A8A
#8A6D1E
#8A6D1E
Triadic
Three colors 120° apart
#1E3A8A
#1E3A8A
#8A1E3B
#8A1E3B
#3B8A1E
#3B8A1E
Analogous
Two neighbors ±30° on the wheel
#1E718A
#1E718A
#1E3A8A
#1E3A8A
#371E8A
#371E8A
Split-complementary
Base + two colors flanking its complement
#1E3A8A
#1E3A8A
#8A371E
#8A371E
#718A1E
#718A1E
Tetradic
Two complementary pairs
#1E3A8A
#1E3A8A
#6D1E8A
#6D1E8A
#8A6D1E
#8A6D1E
#3B8A1E
#3B8A1E
Square
Four colors evenly spaced 90° apart
#1E3A8A
#1E3A8A
#8A1E71
#8A1E71
#8A6D1E
#8A6D1E
#1E8A37
#1E8A37
Blue 900 in every color space
Full conversion of Blue 900 across the color spaces designers and developers actually use — including OKLCH (the perceptually-uniform space that powers Tailwind v4 and CSS Color Module Level 4) and HWB.
HEX
#1E3A8A
RGB
rgb(30, 58, 138)
CMYK
cmyk(78%, 58%, 0%, 46%)
HSL
hsl(224, 64%, 33%)
HSV
hsv(224, 78%, 54%)
HWB
hwb(224 12% 46%)
CIE Lab
lab(27.1 20.0 -47.6)
OKLCH
oklch(37.9% 0.138 265.5)
XYZ (D65)
xyz(6.63, 5.14, 24.68)
Copy-ready code for Blue 900
Drop-in snippets for CSS, Tailwind, Sass, iOS Swift, and Android XML. Click the copy button on any snippet to put it on your clipboard.
CSS
color: #1E3A8A;
background-color: #1E3A8A;CSS variable
:root {
--color-blue-900: #1E3A8A;
}Tailwind config
// tailwind.config.js
colors: {
'blue-900': '#1E3A8A',
}Sass
$color-blue-900: #1E3A8A;Swift UIColor
UIColor(red: 0.118, green: 0.227, blue: 0.541, alpha: 1.0)Android XML
<color name="blue-900">#1E3A8A</color>Closest match in every color system
The nearest Blue 900 equivalent in every other color system on this site, ranked by ΔE2000 perceptual distance. Useful when translating between design-system, web-standard, and industrial color references.
Closest in Tailwind CSS palette
Top 6 ΔE2000-closest entries within the same collection.
Closest Pantone matches
Top 6 ΔE2000-closest Pantone references. Cross-system matching is approximate — see disclaimer.
Closest RAL Classic matches
Top 6 ΔE2000-closest RAL Classic references for industrial coating cross-reference.
RAL 5017
#063971
Traffic blue
RAL 5000
#354D73
Violet blue
RAL 5005
#1E2460
Signal blue
RAL 5020
#1D334A
Ocean blue
RAL 5010
#0E294B
Gentian blue
RAL 5019
#1B5583
Capri blue
FAQ about Blue 900
What is the HEX code for Blue 900?
Blue 900 (blue-900) has the HEX code #1E3A8A. In RGB it is rgb(30, 58, 138), and in CMYK it is cmyk(78%, 58%, 0%, 46%).
What is the OKLCH value of Blue 900?
Blue 900 converts to oklch(0.379 0.138 265.5). OKLCH is the perceptually uniform color space used by Tailwind v4 and CSS Color Module Level 4.
Is Blue 900 accessible for body text?
Used as a background, Blue 900 has a contrast ratio of 2.03:1 with black text and 10.36:1 with white text. WCAG 2.1 AA requires 4.5:1 for normal text. The current recommendation is to use white text and verify in real UI context.
What is the closest Pantone to Blue 900?
The closest Pantone reference to Blue 900 by ΔE2000 perceptual distance is Pantone 286 U (#1F3A93). Cross-system Pantone matching is approximate; for color-critical print work, verify with a physical Pantone guide.
What is the closest RAL color to Blue 900?
The closest RAL Classic reference to Blue 900 by ΔE2000 distance is RAL 5017 (Traffic blue, #063971). RAL is a German industrial coating standard commonly used for paint, powder coat, and architectural specification.
What is the complementary color of Blue 900?
The complementary color (180° opposite on the HSL color wheel) of Blue 900 is #8A6D1E. Use it for high-contrast accents, error states, or call-to-action pairings.
Data provenance & source
Tailwind CSS default palette (v3)
The default color palette shipped with Tailwind CSS v3 by Tailwind Labs Inc. Use as a reference for design tokens, web color systems, and Tailwind-based design conversations. Names like 'blue-500' are the project's own naming convention.
- Source type
- derived
- Confidence
- high
- License
- MIT
- Last reviewed
- 2026-05-24
Workflow tags
Tailwind palette values are designed for digital interfaces under sRGB. For print, convert to a process-appropriate value and proof against the substrate; do not rely on sRGB CMYK conversion for color-critical print work.