Tailwind CSS v3 color
Tailwind purple-900 #581C87
Tailwind CSS v3's purple-900 is #581C87. It is a dark soft violet in the violet family. In OKLCH it sits at lightness 0.381, chroma 0.166 and hue 305.0°. The nearest CSS named color is indigo (#4B0082), ΔE2000 4.2 away.
- Relative luminance
- 0.0465
- OKLCH L · C · h
- 0.381 · 0.166 · 305.0
- Best text
- White 10.87:1
- Hue family
- Violet
#581C87 color codes
- HEX
#581C87- RGB
rgb(88, 28, 135)- HSL
hsl(274, 66%, 32%)- OKLCH
oklch(0.381 0.166 305.0)- OKLab
oklab(0.381 0.095 -0.136)- CIELAB (D65)
L* 25.73, a* 46.44, b* -47.77- XYZ (D65)
X 8.81, Y 4.65, Z 23.35- CMYK (naive)
cmyk(35%, 79%, 0%, 47%)
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 #581C87 accessible?
White text on it reaches 10.87:1, passing AAA. Black text fails at 1.93:1.
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
1.93:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc +9
-
White text on it
10.87:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc −98
-
As text on black
1.93:1
- AA fails
- AA large fails
- AAA fails
- APCA Lc −8
-
As text on white
10.87:1
- AA passes
- AA large passes
- AAA passes
- APCA Lc +94
Nearest versions that pass 4.5:1
-
For text on white
#581C87 10.87:1
It already reaches 10.87:1 on white, so no change is needed.
-
For text on black
#925BC8 4.55:1
Lightening its OKLCH lightness from 0.38 to 0.58 reaches 4.55:1 on black, keeping the hue.
Checking another pair? Use the Contrast Checker.
Studio
Adjust #581C87 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.
Scale
Shades and tints of #581C87
Eleven OKLCH lightness steps at this hue, each with its contrast against white and black. #581C87 sits at step 800.
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.
Gamut
How vivid #581C87 can get
At its lightness and hue, sRGB reaches OKLCH chroma 0.198; #581C87 uses 84% of it. Display P3, which many recent phones and laptops show, reaches 0.208 there: 5% more.
- sRGB
- Display P3
- Rec. 2020
- Dominant wavelength
- OKLCH chroma
- 0.166
- sRGB edge
- 0.198
- Display P3 edge
- 0.208
- Rec. 2020 edge
- 0.231
- Dominant wavelength
- Complementary 565 nm
- Excitation purity
- 63%
- Chromaticity
- x 0.2393, y 0.1264
- This color#581C87
- Most vivid in sRGB#5C0094
- Most vivid in Display P3oklch(0.381 0.208 305.0)
On a screen without Display P3 the last tile shows the sRGB edge instead.
.accent {
color: #581c87;
}
@media (color-gamut: p3) {
.accent { color: color(display-p3 0.3335 0 0.571); }
}Mixing
Mixing #581C87
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%#AC8EC3
- OKLab50%#A78FC5
- OKLCH50%#A78FC5
Black #000000
- sRGB50%#2C0E44
- OKLab50%#1D0531
- OKLCH50%#1D0531
Its complement #374B00
- sRGB50%#483444
- OKLab50%#473E52
- OKLCH50%#004B59
/* A gradient and a mix, worked out in OKLCH */
background: linear-gradient(in oklch, #581c87, white);
color: color-mix(in oklch, #581c87 50%, white);In use
#581C87 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, 4.5:110.87:1 Passes
- Link and body-size textText, 4.5:110.87:1 Passes
- Large headingLarge text, 3:110.87:1 Passes
- Icons, borders and focus ringsNon-text, 3:110.87:1 Passes
Dark page
- Button labelText, 4.5:110.87:1 Passes
- Link and body-size textText, 4.5:11.72:1 Fails
- Large headingLarge text, 3:11.72:1 Fails
- Icons, borders and focus ringsNon-text, 3:11.72:1 Fails
For text on this page, the nearest shade that passes is #9963D0 4.50:1
Color vision
How #581C87 looks with color blindness
Achromatopsia changes it most, ΔE2000 26.8; protanopia changes it least, 16.7.
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
#003B8A ΔE2000 16.7
Distinct
Reads as dark soft blue
-
Deuteranopia
No working green (medium-wavelength) cones
#003D85 ΔE2000 17.9
Distinct
Reads as dark soft blue
-
Tritanopia
No working blue (short-wavelength) cones
#4F3851 ΔE2000 16.9
Distinct
Reads as dark muted magenta
-
Achromatopsia
No cone color vision; lightness only
#3D3D3D ΔE2000 26.8
Distinct
Reads as dark gray
Pairing check
Checked against its complement, #374B00. Their lightness contrast is only 1.12:1, so where hue collapses, add a label, icon or pattern.
| Vision | The pair | ΔE2000 | Verdict |
|---|---|---|---|
| Normal vision | #581C87 · #374B00 | 65.2 | Stays distinct |
| Protanopia | #003B8A · #504500 | 50.6 | Stays distinct |
| Deuteranopia | #003D85 · #4D4408 | 47.8 | Stays distinct |
| Tritanopia | #4F3851 · #3A473E | 24.5 | Stays distinct |
| Achromatopsia | #3D3D3D · #444444 | 2.3 | Easily confused |
Harmony
Color harmonies for #581C87
Its complement is #374B00, a dark muted green.
Hue rotations in OKLCH, mapped into sRGB by trimming chroma so hue and lightness stay put.
Open the Harmony Studio- Base#581C87
- Complement#374B00
Complementary
Open in Harmony Studio- −30°#2F2F98
- Base#581C87
- +30°#720464
Analogous
Open in Harmony Studio- Base#581C87
- +120°#613700
- +240°#004E47
Triadic
Open in Harmony Studio- Base#581C87
- +150°#504100
- +210°#00512B
Split-complementary
Open in Harmony StudioCode
Design tokens
Ready-to-paste tokens in six formats. Rename them to fit your system.
:root {
--color-purple-900: #581c87;
}// tailwind.config.js — already built in as purple-900;
// pin the v3 value explicitly like this:
module.exports = {
theme: {
extend: {
colors: {
purple: { 900: '#581c87' },
},
},
},
};/* app.css — Tailwind CSS v4 */
@import "tailwindcss";
@theme {
/* v4 has its own purple-900; this pins the v3 value. */
--color-purple-900: oklch(0.381 0.166 305.0);
}{
"color": {
"purple-900": {
"$type": "color",
"$value": {
"colorSpace": "srgb",
"components": [0.3451, 0.1098, 0.5294],
"hex": "#581c87"
},
"$description": "Tailwind CSS v3 purple-900"
}
}
}import SwiftUI
enum Palette {
static let purple900 = Color(.sRGB, red: 0.345, green: 0.110, blue: 0.529, opacity: 1)
}import androidx.compose.ui.graphics.Color
object Palette {
val Purple900 = Color(0xFF581C87)
}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 #581C87 in the tools
Each opens over this page. More colors live in the Color Library, and every color page is listed on the hub.
- Color InspectorEvery format, its names, contrast and color vision in one panel.
- Contrast SystemBlack and white text on this color, with fixes in both directions.
- Harmony StudioPalettes built from this color, walked to a contrast target if you ask.
- Color Space ConverterThe same color in 34 notations, with its gamut headroom.
- Color Name FinderThe nearest of 1,055 color names by ΔE2000.