What color is #005366?

#005366 is a dark, vivid cyan. In RGB it is rgb(0, 83, 102), and in HSL hsl(191, 100%, 20%).

Is #005366 accessible as text?

On white, #005366 has a contrast ratio of 8.64:1 (passes WCAG AA for body text); on black it is 2.43:1 (fails). For text placed on #005366, use white for the best readability.

What is the closest Tailwind color to #005366?

The nearest Tailwind CSS token is cyan-900 (#104E64).

What colors go well with #005366?

#005366 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #661300. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #005366 below.

Is #005366 good for buttons?

#005366 works well for buttons and highlights, but use white text on #005366 — black text only reaches 2.43:1, below the 4.5:1 needed for normal-size labels.

Is #005366 the same as CSS darkslategray?

No — #005366 is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#005366 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #005366

Not just a swatch — here's how #005366 works with other colors. Named schemes with #005366 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #005366 Accent #A6C4BF Surface #DFDABF Secondary #9AA0A0 Anchor #1E354A

Dark Slate Gray 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 #005366 Secondary #AEB4B8 Surface #F1F2F0 Support #7B93A5 Anchor #2E3236

Dark Slate Gray 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 #005366 Surface #14161A Highlight #F4F6F8 Secondary #596672 Accent #3A7587

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

Vintage Leather Lead · 5 colors

Lead #005366 Secondary #705116 Surface #E2DCC0 Accent #385244 Anchor #56233E

Dark Slate Gray plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #005366 Secondary #61757C Support #969386 Ink #16140F

Dark Slate Gray 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 Dark Slate Gray carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #005366 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 28/100

Cool

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

Softness 38/100

Low

Middle-weight — neither delicate nor heavy.

Depth 58/100

Moderate

Mid depth — usable as an accent or a muted ground.

Naturalness 2/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 44/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 63/100

High

Restrained and premium — deep, quiet, high-end packaging and fashion.

Brand distinctiveness 20/100

Low

Quiet and neutral — a supporting tone, not a signature.

UI accent fit 65/100

High

Strong interactive accent — visible and can carry a legible label.

Surface fit 36/100

Low

Usable as a tinted surface in measured doses.

Print safety 80/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #005366

For UI

For branding

For interior

For fashion

People also use #005366 with

Sea Green Midnight Blue Rosewood Platinum Dark Slate Gray

UI roles & guardrails

Primary action Safe as a filled button with white label. AAA

Body text Passes on white at 16px and above. Pass

Large display Fine for headings 24px+ on white. Pass

Background Pair with white text at 8.6:1. Use

Subtle surface Use #B9E9F4 for cards and hover fills. Tint 80

Avoid beside #003166 — 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 #005366 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: #005366;
  --color-base-rgb: 0 83 102;
  --color-base-oklch: oklch(40.9% 0.075 220.1);
  --color-50: #F0FCFE;
  --color-100: #D8F6FD;
  --color-200: #B1EEFC;
  --color-300: #77E0F8;
  --color-400: #46CDEC;
  --color-500: #22B2D2;
  --color-600: #23889F;
  --color-700: #1F6170;
  --color-800: #184048;
  --color-900: #11272C;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  dark-slate-gray: {
    50: '#F0FCFE',
    100: '#D8F6FD',
    200: '#B1EEFC',
    300: '#77E0F8',
    400: '#46CDEC',
    500: '#22B2D2',
    600: '#23889F',
    700: '#1F6170',
    800: '#184048',
    900: '#11272C',
  },
}

$base: #005366;
$base-ink: #FFFFFF;
$base-50: #F0FCFE;
$base-100: #D8F6FD;
$base-200: #B1EEFC;
$base-300: #77E0F8;
$base-400: #46CDEC;
$base-500: #22B2D2;
$base-600: #23889F;
$base-700: #1F6170;
$base-800: #184048;
$base-900: #11272C;
$base-hover: #004352;
$base-subtle: #93DFF0;

{
    "color": {
        "base": {
            "value": "#005366",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0FCFE",
                "type": "color"
            },
            "100": {
                "value": "#D8F6FD",
                "type": "color"
            },
            "200": {
                "value": "#B1EEFC",
                "type": "color"
            },
            "300": {
                "value": "#77E0F8",
                "type": "color"
            },
            "400": {
                "value": "#46CDEC",
                "type": "color"
            },
            "500": {
                "value": "#22B2D2",
                "type": "color"
            },
            "600": {
                "value": "#23889F",
                "type": "color"
            },
            "700": {
                "value": "#1F6170",
                "type": "color"
            },
            "800": {
                "value": "#184048",
                "type": "color"
            },
            "900": {
                "value": "#11272C",
                "type": "color"
            }
        }
    }
}

Palettes built on #005366

Color Lab

Pairs with #005366

UI roles & guardrails

In real applications

Scales

Every model

Export