Tailwind CSS v4 default palette
Tailwind sky-500: #00A6F4
In Tailwind CSS v4, sky-500 is defined as --color-sky-500: oklch(68.5% 0.169 237.323), which is #00A6F4 in hex and rgb(0, 166, 244): a medium, vivid sky blue. In Tailwind v3, sky-500 was #0EA5E9.
In OKLCH, sky-500 has a lightness of 68.5%, chroma 0.169 and hue 237.3°. It is the most saturated shade of the sky scale.
This OKLCH value lies outside sRGB. The hex #00A6F4 is the sRGB fallback from the CSS Color 4 gamut mapping algorithm; on Display P3 screens browsers show a more saturated color, close to color(display-p3 0.2191 0.639 0.9315).
In v3, sky-500 was #0EA5E9. The v4 value is ΔE OK 2.1 away; v4 is more saturated.
Tailwind sky is a light, clear blue between cyan and blue. In v2.2 it replaced the older lightBlue name.
Color codes for sky-500
| Tailwind v4 token | --color-sky-500 |
|---|---|
| OKLCH (source value) | oklch(68.5% 0.169 237.323) |
| HEX | #00A6F4 |
| RGB | rgb(0, 166, 244) |
| HSL | hsl(199, 100%, 48%) |
| HWB | hwb(199 0% 4%) |
| CMYK (naive, no ICC profile) | cmyk(100%, 32%, 0%, 4%) |
| Decimal | 42,740 |
| Display P3 | color(display-p3 0.2191 0.639 0.9315) |
| Tailwind v3 hex | #0EA5E9 |
| Utility classes | bg-sky-500, text-sky-500, border-sky-500 |
Tailwind sky scale
Contrast and accessibility
On sky-500, black text has a contrast ratio of 7.76:1 and passes AAA at any text size; white text reaches 2.70:1.
WCAG 2.2 contrast ratios (success criteria 1.4.3 and 1.4.6: AA needs 4.5:1 for normal text and 3:1 for large text, AAA needs 7:1 and 4.5:1). APCA Lc is the lightness contrast from the APCA-W3 0.0.98G model proposed for WCAG 3; a higher absolute value is more readable, and Lc 75 is its suggested minimum for body text.
| Pair | Ratio | AA | AA large | AAA | AAA large | APCA Lc |
|---|---|---|---|---|---|---|
| Black text on sky-500 | 7.76:1 | Pass | Pass | Pass | Pass | 52.3 |
| White text on sky-500 | 2.70:1 | Fail | Fail | Fail | Fail | −56.9 |
| Sky-500 text on white | 2.70:1 | Fail | Fail | Fail | Fail | 51.7 |
| Sky-500 text on black | 7.76:1 | Pass | Pass | Pass | Pass | −50.2 |
Tints and shades
Each step mixes var(--color-sky-500) with white (tints) or black (shades) in gamma-encoded sRGB, the same result as color-mix(in srgb, var(--color-sky-500), white 25%) in CSS.
Tints (mixed with white)
- 5%
#0daaf5 - 15%
#26b3f6 - 25%
#40bcf7 - 35%
#59c5f8 - 45%
#73cef9 - 55%
#8cd7fa - 65%
#a6e0fb - 75%
#bfe9fc - 85%
#d9f2fd - 95%
#f2fbfe
Shades (mixed with black)
- 5%
#009ee8 - 15%
#008dcf - 25%
#007db7 - 35%
#006c9f - 45%
#005b86 - 55%
#004b6e - 65%
#003a55 - 75%
#002a3d - 85%
#001925 - 95%
#00080c
Color harmonies
Rotating the hue in OKLCH while keeping lightness and chroma, sky-500's complementary color is #E57900 (close to peru), its analogous colors are #00B0C5 and #6C92FF, and its triadic partners are #E8669B and #93A600. For text on top, black gives the higher contrast.
| Harmony | Rotation | Color |
|---|---|---|
| Complementary | +180° | #e57900 |
| Analogous | −30°, +30° | #00b0c5#6c92ff |
| Triadic | +120°, +240° | #e8669b#93a600 |
| Split-complementary | +150°, +210° | #f0695d#c39100 |
Computed in OKLCH: the hue is rotated by 180° (complementary), ±30° (analogous), ±120° (triadic) and 180° ±30° (split-complementary) while lightness and chroma stay fixed. Results that fall outside sRGB are brought back with the CSS Color 4 gamut mapping algorithm. Because this uses OKLCH, the values differ from tools that rotate hue in HSL, but every color keeps the same perceived lightness.
Warm or cool?
Tailwind sky-500 is a cool color: its hue is 199° on the HSL wheel, in the green, blue and violet range that is conventionally called cool.
Nearest named and Tailwind colors
Distance is ΔE OK, the Euclidean distance in OKLab multiplied by 100. Values under about 2 are hard to tell apart side by side.
Nearest CSS named colors
| Color | HEX | ΔE OK |
|---|---|---|
| dodgerblue | #1e90ff | 6.3 |
| cornflowerblue | #6495ed | 7.1 |
| deepskyblue | #00bfff | 7.4 |
Code snippets
<div class="bg-sky-500 text-black">...</div>
<p class="text-sky-500 border-sky-500">...</p>.element {
color: var(--color-sky-500);
background-color: oklch(68.5% 0.169 237.323);
border-color: #00a6f4;
outline-color: rgb(0 166 244);
}import SwiftUI
extension Color {
static let sky500 = Color(red: 0.000, green: 0.651, blue: 0.957)
}import androidx.compose.ui.graphics.Color
val Sky500 = Color(0xFF00A6F4)import 'package:flutter/material.dart';
const sky500 = Color(0xFF00A6F4);<!-- res/values/colors.xml -->
<color name="sky_500">#00A6F4</color>Frequently asked questions
- What is the hex code for Tailwind sky-500?
- In Tailwind CSS v4, sky-500 is oklch(68.5% 0.169 237.323), which converts to #00A6F4 (rgb(0, 166, 244)) in sRGB after gamut mapping, because the OKLCH value is outside sRGB. In Tailwind v3 the same name was #0EA5E9.
- What is the difference between sky-500 in Tailwind v3 and v4?
- v3 used the hex #0EA5E9; v4 redefined the palette in OKLCH as oklch(68.5% 0.169 237.323). In v3, sky-500 was #0EA5E9. The v4 value is ΔE OK 2.1 away; v4 is more saturated.
- How do I use sky-500 in plain CSS?
- Tailwind v4 defines every palette color as a theme variable, so in CSS you write var(--color-sky-500). By default Tailwind only emits the variables your project uses; @theme static emits all of them.
- Can you use white text on sky-500?
- White text on sky-500 has a contrast ratio of 2.70:1, which fails AA even for large text under WCAG 2.2. Black text reaches 7.76:1 and passes both AA and AAA. In APCA terms that is Lc −56.9 for white and Lc 52.3 for black.
- Which CSS named color is closest to sky-500?
- The closest is dodgerblue (#1E90FF) at ΔE OK 6.3, followed by cornflowerblue and deepskyblue.
Last reviewed by Arielton Oberek.