What color is #364E63?

#364E63 is a dark, muted blue. In RGB it is rgb(54, 78, 99), and in HSL hsl(208, 29%, 30%).

Is #364E63 accessible as text?

On white, #364E63 has a contrast ratio of 8.65:1 (passes WCAG AA for body text); on black it is 2.43:1 (fails). For text placed on #364E63, use white for the best readability.

What is the closest Tailwind color to #364E63?

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

What colors go well with #364E63?

#364E63 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #634B36. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #364E63 below.

Is #364E63 good for buttons?

#364E63 works well for buttons and highlights, but use white text on #364E63 — black text only reaches 2.43:1, below the 4.5:1 needed for normal-size labels.

Is #364E63 the same as CSS darkslategray?

No — #364E63 is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#364E63 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #364E63

Not just a swatch — here's how #364E63 works with other colors. Named schemes with #364E63 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #364E63 Accent #A5C4C0 Surface #DEDBBF Secondary #9AA0A1 Anchor #20344A

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 #364E63 Secondary #AEB4B8 Surface #F1F2F0 Support #7C93A6 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 #364E63 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #597084

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 #364E63 Secondary #7F4438 Surface #E1DDC0 Accent #375245 Anchor #57233C

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 #364E63 Secondary #6B747C 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 #364E63 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 37/100

Cool

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

Softness 41/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 56/100

Moderate

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

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 37/100

Low

A faint retro warmth without tipping into sepia.

Luxury 60/100

High

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

Brand distinctiveness 18/100

Very low

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

UI accent fit 55/100

Moderate

Workable accent with care around contrast.

Surface fit 44/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 89/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #364E63

For UI

For branding

For interior

For fashion

People also use #364E63 with

Myrtle Green Yale Blue Coffee Gainsboro Charcoal

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 8.7:1. Use

Subtle surface Use #D4DCE3 for cards and hover fills. Tint 80

Avoid beside #363F63 — 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 #364E63 at work across the surfaces designers actually ship.

Website / UI

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Build faster.

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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: #364E63;
  --color-base-rgb: 54 78 99;
  --color-base-oklch: oklch(41.3% 0.046 245.6);
  --color-50: #F5F8FA;
  --color-100: #E4EBF1;
  --color-200: #CAD7E2;
  --color-300: #A5B9CA;
  --color-400: #819BB1;
  --color-500: #617C94;
  --color-600: #4F6273;
  --color-700: #3C4853;
  --color-800: #293137;
  --color-900: #1B1F23;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  dark-slate-gray: {
    50: '#F5F8FA',
    100: '#E4EBF1',
    200: '#CAD7E2',
    300: '#A5B9CA',
    400: '#819BB1',
    500: '#617C94',
    600: '#4F6273',
    700: '#3C4853',
    800: '#293137',
    900: '#1B1F23',
  },
}

$base: #364E63;
$base-ink: #FFFFFF;
$base-50: #F5F8FA;
$base-100: #E4EBF1;
$base-200: #CAD7E2;
$base-300: #A5B9CA;
$base-400: #819BB1;
$base-500: #617C94;
$base-600: #4F6273;
$base-700: #3C4853;
$base-800: #293137;
$base-900: #1B1F23;
$base-hover: #2B3E4F;
$base-subtle: #BECAD5;

{
    "color": {
        "base": {
            "value": "#364E63",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F8FA",
                "type": "color"
            },
            "100": {
                "value": "#E4EBF1",
                "type": "color"
            },
            "200": {
                "value": "#CAD7E2",
                "type": "color"
            },
            "300": {
                "value": "#A5B9CA",
                "type": "color"
            },
            "400": {
                "value": "#819BB1",
                "type": "color"
            },
            "500": {
                "value": "#617C94",
                "type": "color"
            },
            "600": {
                "value": "#4F6273",
                "type": "color"
            },
            "700": {
                "value": "#3C4853",
                "type": "color"
            },
            "800": {
                "value": "#293137",
                "type": "color"
            },
            "900": {
                "value": "#1B1F23",
                "type": "color"
            }
        }
    }
}

Palettes built on #364E63

Color Lab

Pairs with #364E63

UI roles & guardrails

In real applications

Scales

Every model

Export