What color is #51CDE3?

#51CDE3 is a medium, vivid cyan. In RGB it is rgb(81, 205, 227), and in HSL hsl(189, 72%, 60%).

Is #51CDE3 accessible as text?

On white, #51CDE3 has a contrast ratio of 1.88:1 (fails WCAG AA for body text); on black it is 11.19:1 (passes). For text placed on #51CDE3, use black for the best readability.

What is the closest Tailwind color to #51CDE3?

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

What colors go well with #51CDE3?

#51CDE3 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #E26650. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #51CDE3 below.

Is #51CDE3 good for buttons?

#51CDE3 works well for buttons and highlights, but use black text on #51CDE3 — white text only reaches 1.88:1, below the 4.5:1 needed for normal-size labels.

Is #51CDE3 the same as CSS mediumturquoise?

No — #51CDE3 is not the CSS named color mediumturquoise, but mediumturquoise (#48D1CC) is the closest CSS named color.

#51CDE3 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #51CDE3

Not just a swatch — here's how #51CDE3 works with other colors. Named schemes with #51CDE3 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #51CDE3 Accent #A6C4BE Surface #DFDABE Secondary #9AA0A0 Anchor #1E3549

Lagoon 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 #51CDE3 Secondary #AEB4B8 Surface #F1F2F0 Support #7A94A5 Anchor #2E3236

Lagoon Blue 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 #51CDE3 Surface #14161A Highlight #F4F6F8 Secondary #596672 Accent #8AF3FF

Lagoon 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 Lagoon Blue.

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #51CDE3 Secondary #CAEFF6 Support #979286 Ink #16140F

Lagoon 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 Lagoon Blue carrying the quiet middle.

Modern Café Dominant · 5 colors

Dominant #51CDE3 Anchor #372C1D Surface #EBE5D0 Accent #7E9D74 Secondary #3A3933

Lagoon 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 #51CDE3 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 18/100

Cool

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

Softness 62/100

High

Soft and easy on the eye — gentle backdrops, calm surfaces.

Depth 21/100

Low

Airy and open — recedes, leaves the composition light.

Naturalness 5/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 34/100

Low

A faint retro warmth without tipping into sepia.

Luxury 29/100

Low

Understated — leans refined without going austere.

Brand distinctiveness 43/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 31/100

Low

Workable accent with care around contrast.

Surface fit 46/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 70/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #51CDE3

For UI

For branding

For interior

For fashion

People also use #51CDE3 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 9.9:1. Use

Subtle surface Use #E0F2F5 for cards and hover fills. Tint 80

Avoid beside #509BE2 — 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 #51CDE3 at work across the surfaces designers actually ship.

Website / UI

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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: #51CDE3;
  --color-base-rgb: 81 205 227;
  --color-base-oklch: oklch(78.8% 0.112 211.4);
  --color-50: #F1FCFD;
  --color-100: #DBF5FA;
  --color-200: #B9EBF3;
  --color-300: #89D8E6;
  --color-400: #5DC3D5;
  --color-500: #3BA7BA;
  --color-600: #34808E;
  --color-700: #2A5C64;
  --color-800: #1F3D42;
  --color-900: #152528;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  lagoon-blue: {
    50: '#F1FCFD',
    100: '#DBF5FA',
    200: '#B9EBF3',
    300: '#89D8E6',
    400: '#5DC3D5',
    500: '#3BA7BA',
    600: '#34808E',
    700: '#2A5C64',
    800: '#1F3D42',
    900: '#152528',
  },
}

$base: #51CDE3;
$base-ink: #141310;
$base-50: #F1FCFD;
$base-100: #DBF5FA;
$base-200: #B9EBF3;
$base-300: #89D8E6;
$base-400: #5DC3D5;
$base-500: #3BA7BA;
$base-600: #34808E;
$base-700: #2A5C64;
$base-800: #1F3D42;
$base-900: #152528;
$base-hover: #22B8D3;
$base-subtle: #D0ECF1;

{
    "color": {
        "base": {
            "value": "#51CDE3",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1FCFD",
                "type": "color"
            },
            "100": {
                "value": "#DBF5FA",
                "type": "color"
            },
            "200": {
                "value": "#B9EBF3",
                "type": "color"
            },
            "300": {
                "value": "#89D8E6",
                "type": "color"
            },
            "400": {
                "value": "#5DC3D5",
                "type": "color"
            },
            "500": {
                "value": "#3BA7BA",
                "type": "color"
            },
            "600": {
                "value": "#34808E",
                "type": "color"
            },
            "700": {
                "value": "#2A5C64",
                "type": "color"
            },
            "800": {
                "value": "#1F3D42",
                "type": "color"
            },
            "900": {
                "value": "#152528",
                "type": "color"
            }
        }
    }
}