Slate 400
slate-400 · #94A3B8
HEX
#94A3B8
RGB
rgb(148, 163, 184)
CMYK
cmyk(20%, 11%, 0%, 28%)
HSL
hsl(215, 20%, 65%)
LAB
lab(66.5, -0.7, -12.6)
What is Slate 400?
Slate 400 is the slate-400 reference in the Tailwind CSS palette. Its sRGB value is #94A3B8 (rgb 148, 163, 184). It sits in the neutral 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 Slate 400 as a background.
Black text on this color
White text on this color
Shades, tints & tonal scale of Slate 400
An 11-step tonal scale derived from Slate 400 (#94A3B8). 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
#F6F8F9
#F6F8F9
100
#EEF0F4
#EEF0F4
200
#DDE2E8
#DDE2E8
300
#CAD1DC
#CAD1DC
400
#AFBACA
#AFBACA
500
#94A3B8
#94A3B8
600
#7E8B9C
#7E8B9C
700
#606A78
#606A78
800
#434953
#434953
900
#25292E
#25292E
950
#121416
#121416
Lighter tints (mixed with white)
15%
#AAB5C5
30%
#BDC5D1
45%
#CDD3DC
60%
#DCE0E6
75%
#EAECF0
Darker shades (mixed with black)
15%
#8997AB
30%
#7E8B9D
45%
#707C8C
60%
#616B79
75%
#4D5561
Color harmonies for Slate 400
Classic color-theory harmonies derived from rotating the hue of Slate 400. Use these to build accent palettes, brand systems, and accessible UI color pairings.
Complementary
180° opposite — strongest contrast
#94A3B8
#94A3B8
#B8A994
#B8A994
Triadic
Three colors 120° apart
#94A3B8
#94A3B8
#B894A3
#B894A3
#A3B894
#A3B894
Analogous
Two neighbors ±30° on the wheel
#94B5B8
#94B5B8
#94A3B8
#94A3B8
#9794B8
#9794B8
Split-complementary
Base + two colors flanking its complement
#94A3B8
#94A3B8
#B89794
#B89794
#B5B894
#B5B894
Tetradic
Two complementary pairs
#94A3B8
#94A3B8
#A994B8
#A994B8
#B8A994
#B8A994
#A3B894
#A3B894
Square
Four colors evenly spaced 90° apart
#94A3B8
#94A3B8
#B894B5
#B894B5
#B8A994
#B8A994
#94B897
#94B897
Slate 400 in every color space
Full conversion of Slate 400 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
#94A3B8
RGB
rgb(148, 163, 184)
CMYK
cmyk(20%, 11%, 0%, 28%)
HSL
hsl(215, 20%, 65%)
HSV
hsv(215, 20%, 72%)
HWB
hwb(215 58% 28%)
CIE Lab
lab(66.5 -0.7 -12.6)
OKLCH
oklch(71.1% 0.035 256.8)
XYZ (D65)
xyz(33.96, 35.95, 50.49)
Copy-ready code for Slate 400
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: #94A3B8;
background-color: #94A3B8;CSS variable
:root {
--color-slate-400: #94A3B8;
}Tailwind config
// tailwind.config.js
colors: {
'slate-400': '#94A3B8',
}Sass
$color-slate-400: #94A3B8;Swift UIColor
UIColor(red: 0.580, green: 0.639, blue: 0.722, alpha: 1.0)Android XML
<color name="slate-400">#94A3B8</color>Closest match in every color system
The nearest Slate 400 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 7040
#9DA1AA
Window grey
RAL 7001
#8F999F
Silver grey
RAL 7004
#9EA0A1
Signal grey
RAL 9006
#A5A5A5
White aluminium
RAL 7000
#7E8B92
Squirrel grey
RAL 9007
#8F8F8F
Grey aluminium
FAQ about Slate 400
What is the HEX code for Slate 400?
Slate 400 (slate-400) has the HEX code #94A3B8. In RGB it is rgb(148, 163, 184), and in CMYK it is cmyk(20%, 11%, 0%, 28%).
What is the OKLCH value of Slate 400?
Slate 400 converts to oklch(0.711 0.035 256.8). OKLCH is the perceptually uniform color space used by Tailwind v4 and CSS Color Module Level 4.
Is Slate 400 accessible for body text?
Used as a background, Slate 400 has a contrast ratio of 8.19:1 with black text and 2.56:1 with white text. WCAG 2.1 AA requires 4.5:1 for normal text. The current recommendation is to use black text and verify in real UI context.
What is the closest Pantone to Slate 400?
The closest Pantone reference to Slate 400 by ΔE2000 perceptual distance is Pantone Cool Gray 6 C (#A7A8AA). Cross-system Pantone matching is approximate; for color-critical print work, verify with a physical Pantone guide.
What is the closest RAL color to Slate 400?
The closest RAL Classic reference to Slate 400 by ΔE2000 distance is RAL 7040 (Window grey, #9DA1AA). RAL is a German industrial coating standard commonly used for paint, powder coat, and architectural specification.
What is the complementary color of Slate 400?
The complementary color (180° opposite on the HSL color wheel) of Slate 400 is #B8A994. 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.