Slateblue4
slateblue4 · #473C8B
HEX
#473C8B
RGB
rgb(71, 60, 139)
CMYK
cmyk(49%, 57%, 0%, 45%)
HSL
hsl(248, 40%, 39%)
LAB
lab(30.5, 26.5, -42.6)
What is Slateblue4?
Slateblue4 is the slateblue4 reference in the X11 named colors. Its sRGB value is #473C8B (rgb 71, 60, 139). It sits in the blue family. Historical X Window System color names — the numbered 1-4 lightness variants of the classic xorg-server rgb.txt palette. See disclaimer for accuracy and trademark notes.
Accessibility
WCAG 2.1 contrast checks for Slateblue4 as a background.
Black text on this color
White text on this color
Shades, tints & tonal scale of Slateblue4
An 11-step tonal scale derived from Slateblue4 (#473C8B). 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
#F0EFF6
#F0EFF6
100
#E2E0EC
#E2E0EC
200
#C4C1DA
#C4C1DA
300
#A39EC5
#A39EC5
400
#756DA8
#756DA8
500
#473C8B
#473C8B
600
#3C3376
#3C3376
700
#2E275A
#2E275A
800
#201B3F
#201B3F
900
#120F23
#120F23
950
#090711
#090711
Lighter tints (mixed with white)
15%
#7D78A4
30%
#9E9CB8
45%
#B9B7CA
60%
#CFCEDA
75%
#E3E2E9
Darker shades (mixed with black)
15%
#413781
30%
#3B3276
45%
#342C69
60%
#2C255A
75%
#221C48
Color harmonies for Slateblue4
Classic color-theory harmonies derived from rotating the hue of Slateblue4. Use these to build accent palettes, brand systems, and accessible UI color pairings.
Complementary
180° opposite — strongest contrast
#473C8B
#473C8B
#818B3C
#818B3C
Triadic
Three colors 120° apart
#473C8B
#473C8B
#8B463C
#8B463C
#3C8B46
#3C8B46
Analogous
Two neighbors ±30° on the wheel
#3C598B
#3C598B
#473C8B
#473C8B
#6E3C8B
#6E3C8B
Split-complementary
Base + two colors flanking its complement
#473C8B
#473C8B
#8B6E3C
#8B6E3C
#598B3C
#598B3C
Tetradic
Two complementary pairs
#473C8B
#473C8B
#8B3C81
#8B3C81
#818B3C
#818B3C
#3C8B46
#3C8B46
Square
Four colors evenly spaced 90° apart
#473C8B
#473C8B
#8B3C59
#8B3C59
#818B3C
#818B3C
#3C8B6E
#3C8B6E
Slateblue4 in every color space
Full conversion of Slateblue4 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
#473C8B
RGB
rgb(71, 60, 139)
CMYK
cmyk(49%, 57%, 0%, 45%)
HSL
hsl(248, 40%, 39%)
HSV
hsv(248, 57%, 55%)
HWB
hwb(248 24% 45%)
CIE Lab
lab(30.5 26.5 -42.6)
OKLCH
oklch(41.2% 0.126 285.8)
XYZ (D65)
xyz(8.87, 6.43, 25.20)
Copy-ready code for Slateblue4
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: #473C8B;
background-color: #473C8B;CSS variable
:root {
--color-slateblue4: #473C8B;
}Tailwind config
// tailwind.config.js
colors: {
'slateblue4': '#473C8B',
}Sass
$color-slateblue4: #473C8B;Swift UIColor
UIColor(red: 0.278, green: 0.235, blue: 0.545, alpha: 1.0)Android XML
<color name="slateblue4">#473C8B</color>Closest match in every color system
The nearest Slateblue4 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 X11 named colors
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 5000
#354D73
Violet blue
RAL 5005
#1E2460
Signal blue
RAL 5017
#063971
Traffic blue
RAL 5022
#252850
Night blue
RAL 5002
#20214F
Ultramarine blue
RAL 4005
#6C4675
Blue lilac
FAQ about Slateblue4
What is the HEX code for Slateblue4?
Slateblue4 (slateblue4) has the HEX code #473C8B. In RGB it is rgb(71, 60, 139), and in CMYK it is cmyk(49%, 57%, 0%, 45%).
What is the OKLCH value of Slateblue4?
Slateblue4 converts to oklch(0.412 0.126 285.8). OKLCH is the perceptually uniform color space used by Tailwind v4 and CSS Color Module Level 4.
Is Slateblue4 accessible for body text?
Used as a background, Slateblue4 has a contrast ratio of 2.29:1 with black text and 9.18:1 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 Slateblue4?
The closest Pantone reference to Slateblue4 by ΔE2000 perceptual distance is Pantone 261 C (#4B2E83). Cross-system Pantone matching is approximate; for color-critical print work, verify with a physical Pantone guide.
What is the closest RAL color to Slateblue4?
The closest RAL Classic reference to Slateblue4 by ΔE2000 distance is RAL 5000 (Violet blue, #354D73). RAL is a German industrial coating standard commonly used for paint, powder coat, and architectural specification.
What is the complementary color of Slateblue4?
The complementary color (180° opposite on the HSL color wheel) of Slateblue4 is #818B3C. Use it for high-contrast accents, error states, or call-to-action pairings.
Data provenance & source
X11 named colors (xorg rgb.txt)
The historical X11 color name list shipped in the xorg-server rgb.txt file. Roughly 550 entries covering classic computing color names like 'PapayaWhip', 'MediumAquamarine', and 'DarkSlateGray'. Many CSS named colors originate here. Use as a reference for legacy and creative color names. Most modern CSS implementations accept these names directly.
- Source type
- derived
- Confidence
- high
- License
- MIT/X11 license (X Consortium)
- Last reviewed
- 2026-05-24
Workflow tags
X11 colors are sRGB digital values from a 1980s color system. For print, convert to a process-appropriate color and proof against substrate.