Tailwind CSS v3 color

Tailwind indigo-400 #818CF8

Tailwind CSS v3's indigo-400 is #818CF8. It is a light soft blue in the blue family. In OKLCH it sits at lightness 0.680, chroma 0.158 and hue 276.9°. The nearest CSS named color is cornflowerblue (#6495ED), ΔE2000 7.5 away.

Relative luminance
0.3020
OKLCH L · C · h
0.680 · 0.158 · 276.9
Best text
Black 7.04:1
Hue family
Blue
Inspect this color Check contrast

#818CF8 color codes

HEX
#818CF8
RGB
rgb(129, 140, 248)
HSL
hsl(234, 89%, 74%)
OKLCH
oklch(0.680 0.158 276.9)
OKLab
oklab(0.680 0.019 -0.157)
CIELAB (D65)
L* 61.83, a* 24.19, b* -55.41
XYZ (D65)
X 35.37, Y 30.20, Z 92.75
CMYK (naive)
cmyk(48%, 44%, 0%, 3%)

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 #818CF8 accessible?

Black text on it reaches 7.04:1, passing AAA. White text fails at 2.98:1.

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

    7.04:1

    • AA passes
    • AA large passes
    • AAA passes
    • APCA Lc +47

  • White text on it

    2.98:1

    • AA fails
    • AA large fails
    • AAA fails
    • APCA Lc −61

  • As text on black

    7.04:1

    • AA passes
    • AA large passes
    • AAA passes
    • APCA Lc −45

  • As text on white

    2.98:1

    • AA fails
    • AA large fails
    • AAA fails
    • APCA Lc +56

Nearest versions that pass 4.5:1

  • For text on white

    #636BD4 4.58:1

    Darkening its OKLCH lightness from 0.68 to 0.58 reaches 4.58:1 on white, keeping the hue.

    Compare both in the Contrast System

  • For text on black

    #818CF8 7.04:1

    It already reaches 7.04:1 on black, so no change is needed.

Checking another pair? Use the Contrast Checker.

Studio

Adjust #818CF8 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 #818CF8

Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #818CF8 sits at step 400.

  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. 400This color#818CF8
    White
    2.98
    Black
    7.04
  6. 500#7079E3
    White
    3.79
    Black
    5.53
  7. 600#5A61C8
    White
    5.27
    Black
    3.97
  8. 700#4649AB
    White
    7.49
    Black
    2.80
  9. 800#31308A
    White
    10.93
    Black
    1.92
  10. 900#1E1768
    White
    15.24
    Black
    1.37
  11. 950#0F024A
    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 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. 400This color#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. 700#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 #818CF8 can get

At its lightness and hue, sRGB reaches OKLCH chroma 0.170; #818CF8 uses 93% of it. Display P3, which many recent phones and laptops show, reaches 0.185 there: 8% more.

0.00.20.40.60.80.20.40.60.8 460480500520540560580600620
  • sRGB
  • Display P3
  • Rec. 2020
  • Dominant wavelength
OKLCH chroma
0.158
sRGB edge
0.170
Display P3 edge
0.185
Rec. 2020 edge
0.187
Dominant wavelength
467 nm
Excitation purity
49%
Chromaticity
x 0.2234, y 0.1907
  • This color#818CF8
  • Most vivid in sRGB#808AFF
  • Most vivid in Display P3oklch(0.680 0.185 276.9)

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

Use the wider color where screens show it
.accent {
  color: #818cf8;
}
@media (color-gamut: p3) {
  .accent { color: color(display-p3 0.502 0.5326 1); }
}

Mixing

Mixing #818CF8

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%#C0C6FC
  • OKLab50%#BDC7FF
  • OKLCH50%#BDC7FF

Black #000000

  • sRGB50%#41467C
  • OKLab50%#2E3360
  • OKLCH50%#2E3360

Its complement #B19700

  • sRGB50%#99927C
  • OKLab50%#97989E
  • OKLCH50%#E36C89
In CSS
/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #818cf8, white);
color: color-mix(in oklch, #818cf8 50%, white);

In use

#818CF8 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, 4.5:17.04:1 Passes
  • Link and body-size textText, 4.5:12.98:1 Fails
  • Large headingLarge text, 3:12.98:1 Fails
  • Icons, borders and focus ringsNon-text, 3:12.98:1 Fails

For text on this page, the nearest shade that passes is #636BD4 4.58:1

Dark page

  • Button labelText, 4.5:17.04:1 Passes
  • Link and body-size textText, 4.5:16.28:1 Passes
  • Large headingLarge text, 3:16.28:1 Passes
  • Icons, borders and focus ringsNon-text, 3:16.28:1 Passes

Color vision

How #818CF8 looks with color blindness

Achromatopsia changes it most, ΔE2000 25.7; deuteranopia changes it least, 8.4.

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

    #609AFC ΔE2000 8.9

    Noticeable

    Reads as light soft blue

  • Deuteranopia

    No working green (medium-wavelength) cones

    #5691F6 ΔE2000 8.4

    Noticeable

    Reads as light soft blue

  • Tritanopia

    No working blue (short-wavelength) cones

    #54A3B6 ΔE2000 21.6

    Distinct

    Reads as light muted blue

  • Achromatopsia

    No cone color vision; lightness only

    #959595 ΔE2000 25.7

    Distinct

    Reads as gray

Pairing check

Checked against its complement, #B19700. Their lightness contrast is only 1.03:1, so where hue collapses, add a label, icon or pattern.

VisionThe pairΔE2000Verdict
Normal vision#818CF8 · #B1970061.4Stays distinct
Protanopia#609AFC · #A8930058.0Stays distinct
Deuteranopia#5691F6 · #AF9C1658.9Stays distinct
Tritanopia#54A3B6 · #C08A8044.1Stays distinct
Achromatopsia#959595 · #9898981.0Easily confused

Harmony

Color harmonies for #818CF8

Its complement is #B19700, a light soft amber, 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#818CF8
  • Complement#B19700

Complementary

Open in Harmony Studio
  • −30°#309EF4
  • Base#818CF8
  • +30°#B27BE4

Analogous

Open in Harmony Studio
  • Base#818CF8
  • +120°#E86F4C
  • +240°#14B46F

Triadic

Open in Harmony Studio
  • Base#818CF8
  • +150°#D58300
  • +210°#7EA92A

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-400: #818cf8;
}

Tailwind config

// tailwind.config.js — already built in as indigo-400;
// pin the v3 value explicitly like this:
module.exports = {
  theme: {
    extend: {
      colors: {
        indigo: { 400: '#818cf8' },
      },
    },
  },
};

Tailwind v4 theme

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

@theme {
  /* v4 has its own indigo-400; this pins the v3 value. */
  --color-indigo-400: oklch(0.680 0.158 276.9);
}

Design token (W3C DTCG)

{
  "color": {
    "indigo-400": {
      "$type": "color",
      "$value": {
        "colorSpace": "srgb",
        "components": [0.5059, 0.549, 0.9725],
        "hex": "#818cf8"
      },
      "$description": "Tailwind CSS v3 indigo-400"
    }
  }
}

SwiftUI color

import SwiftUI

enum Palette {
    static let indigo400 = Color(.sRGB, red: 0.506, green: 0.549, blue: 0.973, opacity: 1)
}

Jetpack Compose color

import androidx.compose.ui.graphics.Color

object Palette {
    val Indigo400 = Color(0xFF818CF8)
}

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 #818CF8 in the tools

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