CSS named color

Slate Blue #6A5ACD

The CSS keyword slateblue is #6A5ACD. It is a vivid violet in the violet family. In OKLCH it sits at lightness 0.544, chroma 0.171 and hue 285.5°.

Relative luminance: 0.1478
OKLCH L · C · h: 0.544 · 0.171 · 285.5
Best text: White 5.30:1
Hue family: Violet

Inspect this color Check contrast

#6A5ACD color codes

HEX: #6A5ACD
RGB: rgb(106, 90, 205)
HSL: hsl(248, 53%, 58%)
OKLCH: oklch(0.544 0.171 285.5)
OKLab: oklab(0.544 0.046 -0.165)
CIELAB (D65): L* 45.34, a* 36.04, b* -57.77
XYZ (D65): X 20.62, Y 14.78, Z 59.51
CMYK (naive): cmyk(48%, 56%, 0%, 20%)

CIELAB and XYZ use the D65 white point; CSS lab() uses D50, so paste the OKLCH or HEX value into stylesheets. CMYK here is a plain formula with no press profile.

Legibility

Contrast: is #6A5ACD accessible?

White text on it reaches 5.30:1, passing AA. Black text manages only 3.95:1, enough for large text only.

WCAG 2 gives the same ratio whichever color is the text; APCA does not, so its Lc changes sign and size with polarity.

Open the Contrast System

Black text on it

3.95:1
- AA fails
- AA large passes
- AAA fails
- APCA Lc +27
White text on it

5.30:1
- AA passes
- AA large passes
- AAA fails
- APCA Lc −81
As text on black

3.95:1
- AA fails
- AA large passes
- AAA fails
- APCA Lc −25
As text on white

5.30:1
- AA passes
- AA large passes
- AAA fails
- APCA Lc +76

Nearest versions that pass 4.5:1

For text on white

#6A5ACD 5.30:1

It already reaches 5.30:1 on white, so no change is needed.
For text on black

#7465D9 4.60:1

Lightening its OKLCH lightness from 0.54 to 0.58 reaches 4.60:1 on black, keeping the hue.

Compare both in the Contrast System

Checking another pair? Use the Contrast Checker.

Studio

Adjust #6A5ACD live

Move lightness, chroma and hue in OKLCH, or drag on the map. The map is every lightness and chroma at the current hue: sRGB inside the solid area, Display P3 out to the dashed line.

The studio needs JavaScript.

Scale

Shades and tints of #6A5ACD

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #6A5ACD sits at step 600.

50#F4F4FF

White
1.09
Black
19.23
100#E9E9FF

White
1.19
Black
17.56
200#D3D2FF

White
1.45
Black
14.43
300#B7B4FF

White
1.91
Black
10.98
400#9A90FF

White
2.68
Black
7.80
500#7F72E7

White
3.84
Black
5.46
600This color#6A5ACD

White
5.30
Black
3.95
700#5441AE

White
7.65
Black
2.74
800#3D288D

White
11.13
Black
1.88
900#280D6B

White
15.44
Black
1.36
950#170047

White
18.62
Black
1.12

Under each step, white and black text on it; a bold figure passes 4.5:1.

Gamut

How vivid #6A5ACD can get

At its lightness and hue, sRGB reaches OKLCH chroma 0.266; #6A5ACD uses 64% of it. Display P3, which many recent phones and laptops show, reaches 0.286 there: 7% more.

sRGB
Display P3
Rec. 2020
Dominant wavelength

OKLCH chroma: 0.171
sRGB edge: 0.266
Display P3 edge: 0.286
Rec. 2020 edge: 0.289
Dominant wavelength: 458 nm
Excitation purity: 57%
Chromaticity: x 0.2172, y 0.1558

This color#6A5ACD
Most vivid in sRGB#6E39FF
Most vivid in Display P3oklch(0.544 0.286 285.5)

On a screen without Display P3 the last tile shows the sRGB edge instead.

Use the wider color where screens show it

.accent {
  color: #6a5acd;
}
@media (color-gamut: p3) {
  .accent { color: color(display-p3 0.4045 0.1921 1); }
}

Mixing

Mixing #6A5ACD

Each row is the same mix worked out in a different space, with the halfway color at its end. sRGB, which older CSS gradients use, can sag gray or dark in the middle; OKLab keeps the lightness steps even; OKLCH holds chroma and hue as it goes.

White #FFFFFF

sRGB50%#B5ADE6
OKLab50%#AFADEA
OKLCH50%#AFADEA

Black #000000

sRGB50%#352D67
OKLab50%#241E4E
OKLCH50%#241E4E

Its complement #7A7300

sRGB50%#726767
OKLab50%#6E6E80
OKLCH50%#B44553

In CSS

/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #6a5acd, white);
color: color-mix(in oklch, #6a5acd 50%, white);

In use

#6A5ACD in an interface

A button, a link, a heading, a focused field, an icon and a chart line in this color, on a light page and a dark one. Each check is a WCAG 2 contrast minimum: 1.4.3 for text, 1.4.11 for the rest.

Light page

Button labelText, 4.5:15.30:1 Passes
Link and body-size textText, 4.5:15.30:1 Passes
Large headingLarge text, 3:15.30:1 Passes
Icons, borders and focus ringsNon-text, 3:15.30:1 Passes

Dark page

Button labelText, 4.5:15.30:1 Passes
Link and body-size textText, 4.5:13.52:1 Fails
Large headingLarge text, 3:13.52:1 Passes
Icons, borders and focus ringsNon-text, 3:13.52:1 Passes

For text on this page, the nearest shade that passes is #7B6DE1 4.56:1

Color vision

How #6A5ACD looks with color blindness

Achromatopsia changes it most, ΔE2000 27.0; tritanopia changes it least, 14.0.

Simulated with Machado et al. (2009) at full severity, in linear light.

Simulate a whole page What each type sees

Protanopia

No working red (long-wavelength) cones

#0E6FD1 ΔE2000 15.2

Distinct

Reads as vivid blue
Deuteranopia

No working green (medium-wavelength) cones

#0668CB ΔE2000 14.1

Distinct

Reads as vivid blue
Tritanopia

No working blue (short-wavelength) cones

#48748B ΔE2000 14.0

Distinct

Reads as muted blue
Achromatopsia

No cone color vision; lightness only

#6B6B6B ΔE2000 27.0

Distinct

Reads as gray

Pairing check

Checked against its complement, #7A7300. Their lightness contrast is only 1.08:1, so where hue collapses, add a label, icon or pattern.

Vision	The pair	ΔE2000	Verdict
Normal vision	#6A5ACD · #7A7300	63.9	Stays distinct
Protanopia	#0E6FD1 · #7E6E00	56.0	Stays distinct
Deuteranopia	#0668CB · #817210	56.2	Stays distinct
Tritanopia	#48748B · #846A61	28.9	Stays distinct
Achromatopsia	#6B6B6B · #717171	2.3	Easily confused

Harmony

Color harmonies for #6A5ACD

Its complement is #7A7300, a soft yellow.

Hue rotations in OKLCH, mapped into sRGB by trimming chroma so hue and lightness stay put.

Open the Harmony Studio

Base#6A5ACD
Complement#7A7300

Complementary

Open in Harmony Studio

−30°#156DD0
Base#6A5ACD
+30°#9549B2

Analogous

Open in Harmony Studio

Base#6A5ACD
+120°#B54A00
+240°#008460

Triadic

Open in Harmony Studio

Base#6A5ACD
+150°#966400
+210°#408300

Split-complementary

Open in Harmony Studio

Code

Design tokens

Ready-to-paste tokens in six formats. Rename them to fit your system.

CSS custom property

:root {
  --color-slateblue: #6a5acd;
}

Tailwind config

// tailwind.config.js
module.exports = {
  theme: {
    extend: {
      colors: {
        slateblue: '#6a5acd',
      },
    },
  },
};

Tailwind v4 theme

/* app.css — Tailwind CSS v4 */
@import "tailwindcss";

@theme {
  --color-slateblue: oklch(0.544 0.171 285.5);
}

Design token (W3C DTCG)

{
  "color": {
    "slateblue": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.4157, 0.3529, 0.8039],
        "hex": "#6a5acd"
      },
      "$description": "CSS named color slateblue"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let slateblue = Color(.sRGB, red: 0.416, green: 0.353, blue: 0.804, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Slateblue = Color(0xFF6A5ACD)
}

Matches

The nearest match in each system

The closest CSS name, Tailwind shade, RAL Classic paint and Crayola crayon by ΔE2000; under 2 is hard to tell apart side by side. RAL and Crayola values approximate physical colors.

Tools

Open #6A5ACD in the tools

Each opens over this page. More colors live in the Color Library, and every color page is listed on the hub.

Slate Blue #6A5ACD

#6A5ACD color codes

Contrast: is #6A5ACD accessible?

Black text on it

White text on it

As text on black

As text on white

Nearest versions that pass 4.5:1

Adjust #6A5ACD live

Shades and tints of #6A5ACD

How vivid #6A5ACD can get

Mixing #6A5ACD

#6A5ACD in an interface

How #6A5ACD looks with color blindness

Protanopia

Deuteranopia

Tritanopia

Achromatopsia

Pairing check

Color harmonies for #6A5ACD

Complementary

Analogous

Triadic

Split-complementary

Design tokens

CSS custom property

Tailwind config

Tailwind v4 theme

Design token (W3C DTCG)

SwiftUI color

Jetpack Compose color

The nearest match in each system

Similar colors

Open #6A5ACD in the tools