What color is #40D5EF?

#40D5EF is a medium, vivid cyan. In RGB it is rgb(64, 213, 239), and in HSL hsl(189, 85%, 59%).

Is #40D5EF accessible as text?

On white, #40D5EF has a contrast ratio of 1.75:1 (fails WCAG AA for body text); on black it is 11.98:1 (passes). For text placed on #40D5EF, use black for the best readability.

What is the closest Tailwind color to #40D5EF?

The nearest Tailwind CSS token is cyan-400 (#00D3F2).

What colors go well with #40D5EF?

#40D5EF pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #EF583E. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #40D5EF below.

Is #40D5EF good for buttons?

#40D5EF works well for buttons and highlights, but use black text on #40D5EF — white text only reaches 1.75:1, below the 4.5:1 needed for normal-size labels.

Is #40D5EF the same as CSS mediumturquoise?

No — #40D5EF is not the CSS named color mediumturquoise, but mediumturquoise (#48D1CC) is the closest CSS named color.

#40D5EF Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #40D5EF

Not just a swatch — here's how #40D5EF works with other colors. Named schemes with #40D5EF in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #40D5EF Accent #A6C4BE Surface #DFDABE Secondary #9AA0A0 Anchor #1E3549

Bright Sky opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.

Nordic Calm Accent · 5 colors

Accent #40D5EF Secondary #AEB4B8 Surface #F1F2F0 Support #7A94A5 Anchor #2E3236

Bright Sky keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.

Tech Product Signal · 5 colors

Signal #40D5EF Surface #14161A Highlight #F4F6F8 Secondary #596672 Accent #82FBFF

Bright Sky is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Bright Sky.

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #40D5EF Secondary #CDF6FF Support #979286 Ink #16140F

Bright Sky is the single accent in this high-contrast editorial system — set on near-white paper against near-black ink, with a warm grey and a desaturated tint of Bright Sky carrying the quiet middle.

Modern Café Dominant · 5 colors

Dominant #40D5EF Anchor #372C1D Surface #EBE5D0 Accent #7E9D74 Secondary #3A3933

Bright Sky anchors this café scheme as the warm mid-tone, lifted by latte cream and a muted sage accent and grounded by espresso brown and a warm charcoal.

Build a working theme in the generator →

Color Lab

How #40D5EF actually behaves in design work — read from its OKLCH lightness, chroma and hue, not just its raw numbers. Ten signals to help you decide where this color earns its place.

Warmth 14/100

Cool

Reads cool and recessive — calming, technical, good for trust-led UI.

Softness 61/100

High

Middle-weight — neither delicate nor heavy.

Depth 20/100

Very low

Airy and open — recedes, leaves the composition light.

Naturalness 4/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 30/100

Low

A faint retro warmth without tipping into sepia.

Luxury 26/100

Low

Understated — leans refined without going austere.

Brand distinctiveness 49/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 26/100

Low

Weak as an action color — too pale, too dark or too muted to signal.

Surface fit 43/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 66/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #40D5EF

For UI

For branding

For interior

For fashion

People also use #40D5EF with

Seafoam Green Royal Blue Terracotta Platinum Dark Slate Gray

UI roles & guardrails

Primary action Safe as a filled button with near-black label. AAA

Body text Do not use for body copy on light surfaces. Avoid

Large display Only on dark surfaces. Avoid

Background Pair with #141310 text at 10.6:1. Use

Subtle surface Use #DDF3F7 for cards and hover fills. Tint 80

Avoid beside #3E99EF — the hue gap is too small to read as intentional. Clash

In real applications

Not a swatch to memorise — a color to build with. Here is #40D5EF at work across the surfaces designers actually ship.

Website / UI

Northwind Sign up

Build faster.

A working theme, generated in seconds.

Dashboard

Revenue

$48.2k ▲ 12%

Brand

AVELINE

Studio

Poster

Nov 14 · 8PM

NIGHT
MARKET

Packaging

BLOOM

Botanical Wash

250 ml

Interior

Every model

Export

:root {
  --color-base: #40D5EF;
  --color-base-rgb: 64 213 239;
  --color-base-oklch: oklch(80.7% 0.126 212.0);
  --color-50: #F0FCFE;
  --color-100: #D8F7FD;
  --color-200: #B4EEF9;
  --color-300: #81DEEE;
  --color-400: #53CADF;
  --color-500: #30AFC5;
  --color-600: #2C8696;
  --color-700: #255F6A;
  --color-800: #1C3F45;
  --color-900: #13272A;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  bright-sky: {
    50: '#F0FCFE',
    100: '#D8F7FD',
    200: '#B4EEF9',
    300: '#81DEEE',
    400: '#53CADF',
    500: '#30AFC5',
    600: '#2C8696',
    700: '#255F6A',
    800: '#1C3F45',
    900: '#13272A',
  },
}

$base: #40D5EF;
$base-ink: #141310;
$base-50: #F0FCFE;
$base-100: #D8F7FD;
$base-200: #B4EEF9;
$base-300: #81DEEE;
$base-400: #53CADF;
$base-500: #30AFC5;
$base-600: #2C8696;
$base-700: #255F6A;
$base-800: #1C3F45;
$base-900: #13272A;
$base-hover: #12C0DF;
$base-subtle: #CBEEF4;

{
    "color": {
        "base": {
            "value": "#40D5EF",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0FCFE",
                "type": "color"
            },
            "100": {
                "value": "#D8F7FD",
                "type": "color"
            },
            "200": {
                "value": "#B4EEF9",
                "type": "color"
            },
            "300": {
                "value": "#81DEEE",
                "type": "color"
            },
            "400": {
                "value": "#53CADF",
                "type": "color"
            },
            "500": {
                "value": "#30AFC5",
                "type": "color"
            },
            "600": {
                "value": "#2C8696",
                "type": "color"
            },
            "700": {
                "value": "#255F6A",
                "type": "color"
            },
            "800": {
                "value": "#1C3F45",
                "type": "color"
            },
            "900": {
                "value": "#13272A",
                "type": "color"
            }
        }
    }
}