What color is #21C8CD?

#21C8CD is a medium, vivid cyan. In RGB it is rgb(33, 200, 205), and in HSL hsl(182, 72%, 47%).

Is #21C8CD accessible as text?

On white, #21C8CD has a contrast ratio of 2.06:1 (fails WCAG AA for body text); on black it is 10.21:1 (passes). For text placed on #21C8CD, use black for the best readability.

What is the closest Tailwind color to #21C8CD?

The nearest Tailwind CSS token is teal-400 (#00D5BE).

What colors go well with #21C8CD?

#21C8CD pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #CE2722. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #21C8CD below.

Is #21C8CD good for buttons?

#21C8CD works well for buttons and highlights, but use black text on #21C8CD — white text only reaches 2.06:1, below the 4.5:1 needed for normal-size labels.

Is #21C8CD the same as CSS darkturquoise?

No — #21C8CD is not the CSS named color darkturquoise, but darkturquoise (#00CED1) is the closest CSS named color.

#21C8CD Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #21C8CD

Not just a swatch — here's how #21C8CD works with other colors. Named schemes with #21C8CD in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #21C8CD Accent #A6C4BD Surface #E0DABE Secondary #9AA0A0 Anchor #1D3549

Robin Egg Blue 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 #21C8CD Secondary #AEB4B8 Surface #F1F2F0 Support #7A94A5 Anchor #2E3236

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

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #21C8CD Secondary #BDE7E8 Support #979286 Ink #16140F

Robin Egg Blue 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 Robin Egg Blue carrying the quiet middle.

Tech Product Signal · 5 colors

Signal #21C8CD Surface #14161A Highlight #F4F6F8 Secondary #596771 Accent #70EEF2

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

Modern Café Dominant · 5 colors

Dominant #21C8CD Anchor #382C1D Surface #EBE4D0 Accent #809D72 Secondary #3A3933

Robin Egg Blue 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 #21C8CD 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 19/100

Cool

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

Softness 58/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 25/100

Low

Airy and open — recedes, leaves the composition light.

Naturalness 13/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 35/100

Low

A faint retro warmth without tipping into sepia.

Luxury 32/100

Low

Understated — leans refined without going austere.

Brand distinctiveness 48/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 40/100

Moderate

Workable accent with care around contrast.

Surface fit 39/100

Low

Usable as a tinted surface in measured doses.

Print safety 68/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #21C8CD

For UI

For branding

For interior

For fashion

People also use #21C8CD with

Shamrock True Blue Fire Engine Red 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 9.0:1. Use

Subtle surface Use #D6F1F2 for cards and hover fills. Tint 80

Avoid beside #228FCE — 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 #21C8CD 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: #21C8CD;
  --color-base-rgb: 33 200 205;
  --color-base-oklch: oklch(75.8% 0.124 198.2);
  --color-50: #F1FDFD;
  --color-100: #DBF9FA;
  --color-200: #B9F2F3;
  --color-300: #89E3E6;
  --color-400: #5DD1D5;
  --color-500: #3BB6BA;
  --color-600: #348B8E;
  --color-700: #2A6364;
  --color-800: #1F4142;
  --color-900: #152828;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  robin-egg-blue: {
    50: '#F1FDFD',
    100: '#DBF9FA',
    200: '#B9F2F3',
    300: '#89E3E6',
    400: '#5DD1D5',
    500: '#3BB6BA',
    600: '#348B8E',
    700: '#2A6364',
    800: '#1F4142',
    900: '#152828',
  },
}

$base: #21C8CD;
$base-ink: #141310;
$base-50: #F1FDFD;
$base-100: #DBF9FA;
$base-200: #B9F2F3;
$base-300: #89E3E6;
$base-400: #5DD1D5;
$base-500: #3BB6BA;
$base-600: #348B8E;
$base-700: #2A6364;
$base-800: #1F4142;
$base-900: #152828;
$base-hover: #1BA0A5;
$base-subtle: #C0EBED;

{
    "color": {
        "base": {
            "value": "#21C8CD",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1FDFD",
                "type": "color"
            },
            "100": {
                "value": "#DBF9FA",
                "type": "color"
            },
            "200": {
                "value": "#B9F2F3",
                "type": "color"
            },
            "300": {
                "value": "#89E3E6",
                "type": "color"
            },
            "400": {
                "value": "#5DD1D5",
                "type": "color"
            },
            "500": {
                "value": "#3BB6BA",
                "type": "color"
            },
            "600": {
                "value": "#348B8E",
                "type": "color"
            },
            "700": {
                "value": "#2A6364",
                "type": "color"
            },
            "800": {
                "value": "#1F4142",
                "type": "color"
            },
            "900": {
                "value": "#152828",
                "type": "color"
            }
        }
    }
}

Palettes built on #21C8CD

Color Lab

Pairs with #21C8CD

UI roles & guardrails

In real applications

Scales

Every model

Export