Tailwind CSS v3 color

Tailwind purple-800 #6B21A8

Tailwind CSS v3's purple-800 is #6B21A8. It is a dark vivid violet in the violet family. In OKLCH it sits at lightness 0.438, chroma 0.198 and hue 303.7°. The nearest CSS named color is rebeccapurple (#663399), ΔE2000 4.0 away.

Relative luminance
0.0704
OKLCH L · C · h
0.438 · 0.198 · 303.7
Best text
White 8.72:1
Hue family
Violet
Inspect this color Check contrast

#6B21A8 color codes

HEX
#6B21A8
RGB
rgb(107, 33, 168)
HSL
hsl(273, 67%, 39%)
OKLCH
oklch(0.438 0.198 303.7)
OKLab
oklab(0.438 0.110 -0.165)
CIELAB (D65)
L* 31.90, a* 55.53, b* -57.83
XYZ (D65)
X 13.67, Y 7.04, Z 37.68
CMYK (naive)
cmyk(36%, 80%, 0%, 34%)

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 #6B21A8 accessible?

White text on it reaches 8.72:1, passing AAA. Black text fails at 2.40:1.

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

    2.40:1

    • AA fails
    • AA large fails
    • AAA fails
    • APCA Lc +15

  • White text on it

    8.72:1

    • AA passes
    • AA large passes
    • AAA passes
    • APCA Lc −93

  • As text on black

    2.40:1

    • AA fails
    • AA large fails
    • AAA fails
    • APCA Lc −13

  • As text on white

    8.72:1

    • AA passes
    • AA large passes
    • AAA passes
    • APCA Lc +88

Nearest versions that pass 4.5:1

  • For text on white

    #6B21A8 8.72:1

    It already reaches 8.72:1 on white, so no change is needed.

  • For text on black

    #9553D9 4.51:1

    Lightening its OKLCH lightness from 0.44 to 0.58 reaches 4.51:1 on black, keeping the hue.

    Compare both in the Contrast System

Checking another pair? Use the Contrast Checker.

Studio

Adjust #6B21A8 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 #6B21A8

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #6B21A8 sits at step 700.

  1. 50#F7F2FF
    White
    1.09
    Black
    19.09
  2. 100#F0E6FF
    White
    1.20
    Black
    17.46
  3. 200#E1CCFF
    White
    1.47
    Black
    14.28
  4. 300#CFA9FF
    White
    1.94
    Black
    10.77
  5. 400#BB7FFF
    White
    2.76
    Black
    7.59
  6. 500#A15FE5
    White
    3.97
    Black
    5.28
  7. 600#8845C9
    White
    5.61
    Black
    3.74
  8. 700This color#6B21A8
    White
    8.72
    Black
    2.40
  9. 800#560D8B
    White
    11.50
    Black
    1.82
  10. 900#3A0062
    White
    15.48
    Black
    1.35
  11. 950#21003B
    White
    18.61
    Black
    1.12

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

Tailwind CSS v3 purple scale

The real Tailwind palette, for comparison with the computed ramp above.

  1. 50#FAF5FF
    White
    1.07
    Black
    19.56
  2. 100#F3E8FF
    White
    1.17
    Black
    17.79
  3. 200#E9D5FF
    White
    1.36
    Black
    15.42
  4. 300#D8B4FE
    White
    1.76
    Black
    11.87
  5. 400#C084FC
    White
    2.64
    Black
    7.94
  6. 500#A855F7
    White
    3.95
    Black
    5.30
  7. 600#9333EA
    White
    5.38
    Black
    3.90
  8. 700#7E22CE
    White
    6.98
    Black
    3.00
  9. 800This color#6B21A8
    White
    8.72
    Black
    2.40
  10. 900#581C87
    White
    10.87
    Black
    1.93
  11. 950#3B0764
    White
    14.99
    Black
    1.40

Gamut

How vivid #6B21A8 can get

At its lightness and hue, sRGB reaches OKLCH chroma 0.229; #6B21A8 uses 86% of it. Display P3, which many recent phones and laptops show, reaches 0.240 there: 5% more.

0.00.20.40.60.80.20.40.60.8 460480500520540560580600620
  • sRGB
  • Display P3
  • Rec. 2020
  • Dominant wavelength
OKLCH chroma
0.198
sRGB edge
0.229
Display P3 edge
0.240
Rec. 2020 edge
0.267
Dominant wavelength
Complementary 565 nm
Excitation purity
65%
Chromaticity
x 0.2342, y 0.1206
  • This color#6B21A8
  • Most vivid in sRGB#6F00B5
  • Most vivid in Display P3oklch(0.438 0.240 303.7)

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

Use the wider color where screens show it
.accent {
  color: #6b21a8;
}
@media (color-gamut: p3) {
  .accent { color: color(display-p3 0.4023 0 0.6993); }
}

Mixing

Mixing #6B21A8

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%#B590D4
  • OKLab50%#B195D7
  • OKLCH50%#B195D7

Black #000000

  • sRGB50%#361154
  • OKLab50%#25063F
  • OKLCH50%#25063F

Its complement #465B00

  • sRGB50%#593E54
  • OKLab50%#574C67
  • OKLCH50%#942206
In CSS
/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #6b21a8, white);
color: color-mix(in oklch, #6b21a8 50%, white);

In use

#6B21A8 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, 4.5:18.72:1 Passes
  • Link and body-size textText, 4.5:18.72:1 Passes
  • Large headingLarge text, 3:18.72:1 Passes
  • Icons, borders and focus ringsNon-text, 3:18.72:1 Passes

Dark page

  • Button labelText, 4.5:18.72:1 Passes
  • Link and body-size textText, 4.5:12.14:1 Fails
  • Large headingLarge text, 3:12.14:1 Fails
  • Icons, borders and focus ringsNon-text, 3:12.14:1 Fails

For text on this page, the nearest shade that passes is #9F5DE3 4.59:1

Color vision

How #6B21A8 looks with color blindness

Achromatopsia changes it most, ΔE2000 28.6; tritanopia changes it least, 18.1.

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

    #004AAC ΔE2000 18.2

    Distinct

    Reads as dark soft blue

  • Deuteranopia

    No working green (medium-wavelength) cones

    #004BA5 ΔE2000 19.3

    Distinct

    Reads as dark soft blue

  • Tritanopia

    No working blue (short-wavelength) cones

    #5F4665 ΔE2000 18.1

    Distinct

    Reads as dark muted magenta

  • Achromatopsia

    No cone color vision; lightness only

    #4B4B4B ΔE2000 28.6

    Distinct

    Reads as dark gray

Pairing check

Checked against its complement, #465B00. Their lightness contrast is only 1.14:1, so where hue collapses, add a label, icon or pattern.

VisionThe pairΔE2000Verdict
Normal vision#6B21A8 · #465B0071.0Stays distinct
Protanopia#004AAC · #61540055.2Stays distinct
Deuteranopia#004BA5 · #5E530C52.5Stays distinct
Tritanopia#5F4665 · #4A564C25.0Stays distinct
Achromatopsia#4B4B4B · #5454543.1Easily confused

Harmony

Color harmonies for #6B21A8

Its complement is #465B00, a dark soft yellow.

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

Open the Harmony Studio
  • Base#6B21A8
  • Complement#465B00

Complementary

Open in Harmony Studio
  • −30°#373ABC
  • Base#6B21A8
  • +30°#8B007D

Analogous

Open in Harmony Studio
  • Base#6B21A8
  • +120°#774400
  • +240°#006057

Triadic

Open in Harmony Studio
  • Base#6B21A8
  • +150°#635000
  • +210°#006334

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-purple-800: #6b21a8;
}

Tailwind config

// tailwind.config.js — already built in as purple-800;
// pin the v3 value explicitly like this:
module.exports = {
  theme: {
    extend: {
      colors: {
        purple: { 800: '#6b21a8' },
      },
    },
  },
};

Tailwind v4 theme

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

@theme {
  /* v4 has its own purple-800; this pins the v3 value. */
  --color-purple-800: oklch(0.438 0.198 303.7);
}

Design token (W3C DTCG)

{
  "color": {
    "purple-800": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.4196, 0.1294, 0.6588],
        "hex": "#6b21a8"
      },
      "$description": "Tailwind CSS v3 purple-800"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let purple800 = Color(.sRGB, red: 0.420, green: 0.129, blue: 0.659, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Purple800 = Color(0xFF6B21A8)
}

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.

Neighbors

The eight nearest colors on this site by ΔE2000, closest first. Under 2 is hard to tell apart side by side.

Tools

Open #6B21A8 in the tools

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