Tailwind CSS v3 color

Tailwind indigo-700 #4338CA

Tailwind CSS v3's indigo-700 is #4338CA. It is a dark vivid blue in the blue family. In OKLCH it sits at lightness 0.457, chroma 0.215 and hue 277.0°. The nearest CSS named color is blue (#0000FF), ΔE2000 7.6 away.

Relative luminance
0.0829
OKLCH L · C · h
0.457 · 0.215 · 277.0
Best text
White 7.90:1
Hue family
Blue
Inspect this color Check contrast

#4338CA color codes

HEX
#4338CA
RGB
rgb(67, 56, 202)
HSL
hsl(245, 58%, 51%)
OKLCH
oklch(0.457 0.215 277.0)
OKLab
oklab(0.457 0.026 -0.213)
CIELAB (D65)
L* 34.57, a* 48.49, b* -73.72
XYZ (D65)
X 14.39, Y 8.28, Z 56.71
CMYK (naive)
cmyk(67%, 72%, 0%, 21%)

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 #4338CA accessible?

White text on it reaches 7.90:1, passing AAA. Black text fails at 2.65:1.

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

    2.65:1

    • AA fails
    • AA large fails
    • AAA fails
    • APCA Lc +17

  • White text on it

    7.90:1

    • AA passes
    • AA large passes
    • AAA passes
    • APCA Lc −91

  • As text on black

    2.65:1

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

  • As text on white

    7.90:1

    • AA passes
    • AA large passes
    • AAA passes
    • APCA Lc +86

Nearest versions that pass 4.5:1

  • For text on white

    #4338CA 7.90:1

    It already reaches 7.90:1 on white, so no change is needed.

  • For text on black

    #6061F4 4.51:1

    Lightening its OKLCH lightness from 0.46 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 #4338CA 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 #4338CA

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #4338CA sits at step 700.

  1. 50#F2F4FF
    White
    1.09
    Black
    19.15
  2. 100#E6EAFF
    White
    1.19
    Black
    17.57
  3. 200#CDD5FF
    White
    1.44
    Black
    14.55
  4. 300#ADB8FF
    White
    1.89
    Black
    11.07
  5. 400#8B96FF
    White
    2.65
    Black
    7.90
  6. 500#6C71FF
    White
    3.85
    Black
    5.44
  7. 600#5755E6
    White
    5.45
    Black
    3.84
  8. 700This color#4338CA
    White
    7.90
    Black
    2.65
  9. 800#311EA4
    White
    11.33
    Black
    1.85
  10. 900#1F007B
    White
    15.62
    Black
    1.34
  11. 950#10004C
    White
    18.64
    Black
    1.12

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

Tailwind CSS v3 indigo scale

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

  1. 50#EEF2FF
    White
    1.11
    Black
    18.78
  2. 100#E0E7FF
    White
    1.23
    Black
    17.04
  3. 200#C7D2FE
    White
    1.49
    Black
    14.07
  4. 300#A5B4FC
    White
    1.99
    Black
    10.53
  5. 400#818CF8
    White
    2.98
    Black
    7.04
  6. 500#6366F1
    White
    4.46
    Black
    4.70
  7. 600#4F46E5
    White
    6.28
    Black
    3.33
  8. 700This color#4338CA
    White
    7.90
    Black
    2.65
  9. 800#3730A3
    White
    9.93
    Black
    2.11
  10. 900#312E81
    White
    11.42
    Black
    1.83
  11. 950#1E1B4B
    White
    15.98
    Black
    1.31

Gamut

How vivid #4338CA can get

At its lightness and hue, sRGB reaches OKLCH chroma 0.283; #4338CA uses 76% of it. Display P3 reaches no further at this hue.

0.00.20.40.60.80.20.40.60.8 460480500520540560580600620
  • sRGB
  • Display P3
  • Rec. 2020
  • Dominant wavelength
OKLCH chroma
0.215
sRGB edge
0.283
Display P3 edge
0.286
Rec. 2020 edge
0.306
Dominant wavelength
462 nm
Excitation purity
76%
Chromaticity
x 0.1812, y 0.1044
  • This color#4338CA
  • Most vivid in sRGB#4600EE
  • Most vivid in Display P3oklch(0.457 0.286 277.0)

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

Use the wider color where screens show it
.accent {
  color: #4338ca;
}
@media (color-gamut: p3) {
  .accent { color: color(display-p3 0.2474 0 0.9016); }
}

Mixing

Mixing #4338CA

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%#A19CE5
  • OKLab50%#96A1EA
  • OKLCH50%#96A1EA

Black #000000

  • sRGB50%#221C65
  • OKLab50%#140F4D
  • OKLCH50%#140F4D

Its complement #665700

  • sRGB50%#554865
  • OKLab50%#4E5479
  • OKLCH50%#00655F
In CSS
/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #4338ca, white);
color: color-mix(in oklch, #4338ca 50%, white);

In use

#4338CA 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, 4.5:17.90:1 Passes
  • Link and body-size textText, 4.5:17.90:1 Passes
  • Large headingLarge text, 3:17.90:1 Passes
  • Icons, borders and focus ringsNon-text, 3:17.90:1 Passes

Dark page

  • Button labelText, 4.5:17.90:1 Passes
  • Link and body-size textText, 4.5:12.37:1 Fails
  • Large headingLarge text, 3:12.37:1 Fails
  • Icons, borders and focus ringsNon-text, 3:12.37:1 Fails

For text on this page, the nearest shade that passes is #686BFE 4.56:1

Color vision

How #4338CA looks with color blindness

Achromatopsia changes it most, ΔE2000 29.6; deuteranopia changes it least, 8.0.

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

    #0057CE ΔE2000 11.3

    Distinct

    Reads as vivid blue

  • Deuteranopia

    No working green (medium-wavelength) cones

    #004BC7 ΔE2000 8.0

    Noticeable

    Reads as dark vivid blue

  • Tritanopia

    No working blue (short-wavelength) cones

    #00617E ΔE2000 19.7

    Distinct

    Reads as dark muted blue

  • Achromatopsia

    No cone color vision; lightness only

    #515151 ΔE2000 29.6

    Distinct

    Reads as dark gray

Pairing check

Checked against its complement, #665700. Their lightness contrast is only 1.10:1, so where hue collapses, add a label, icon or pattern.

VisionThe pairΔE2000Verdict
Normal vision#4338CA · #66570062.2Stays distinct
Protanopia#0057CE · #61550058.0Stays distinct
Deuteranopia#004BC7 · #655A0859.2Stays distinct
Tritanopia#00617E · #6F4F4935.8Stays distinct
Achromatopsia#515151 · #5757572.1Easily confused

Harmony

Color harmonies for #4338CA

Its complement is #665700, a dark muted brown, on the warm side of the wheel.

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

Open the Harmony Studio
  • Base#4338CA
  • Complement#665700

Complementary

Open in Harmony Studio
  • −30°#005B96
  • Base#4338CA
  • +30°#771BB1

Analogous

Open in Harmony Studio
  • Base#4338CA
  • +120°#992B00
  • +240°#00693E

Triadic

Open in Harmony Studio
  • Base#4338CA
  • +150°#7C4A00
  • +210°#456200

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-indigo-700: #4338ca;
}

Tailwind config

// tailwind.config.js — already built in as indigo-700;
// pin the v3 value explicitly like this:
module.exports = {
  theme: {
    extend: {
      colors: {
        indigo: { 700: '#4338ca' },
      },
    },
  },
};

Tailwind v4 theme

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

@theme {
  /* v4 has its own indigo-700; this pins the v3 value. */
  --color-indigo-700: oklch(0.457 0.215 277.0);
}

Design token (W3C DTCG)

{
  "color": {
    "indigo-700": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.2627, 0.2196, 0.7922],
        "hex": "#4338ca"
      },
      "$description": "Tailwind CSS v3 indigo-700"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let indigo700 = Color(.sRGB, red: 0.263, green: 0.220, blue: 0.792, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Indigo700 = Color(0xFF4338CA)
}

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 #4338CA in the tools

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