What color is #37648B?

#37648B is a dark blue. In RGB it is rgb(55, 100, 139), and in HSL hsl(208, 43%, 38%).

Is #37648B accessible as text?

On white, #37648B has a contrast ratio of 6.25:1 (passes WCAG AA for body text); on black it is 3.36:1 (fails). For text placed on #37648B, use white for the best readability.

What is the closest Tailwind color to #37648B?

The nearest Tailwind CSS token is cyan-800 (#005F78).

What colors go well with #37648B?

#37648B pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #8B5E37. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #37648B below.

Is #37648B good for buttons?

#37648B works well for buttons and highlights, but use white text on #37648B — black text only reaches 3.36:1, below the 4.5:1 needed for normal-size labels.

Is #37648B the same as CSS dimgray?

No — #37648B is not the CSS named color dimgray, but dimgray (#696969) is the closest CSS named color by perceptual color distance — it sits in a different color family, so treat it as a rough reference, not a match.

#37648B Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #37648B

Not just a swatch — here's how #37648B works with other colors. Named schemes with #37648B in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #37648B Accent #A5C4C0 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

Lapis Lazuli 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 #37648B Secondary #AEB4B8 Surface #F1F2F0 Support #7C93A6 Anchor #2E3236

Lapis Lazuli 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 #37648B Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #5E87AC

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

Vintage Leather Lead · 5 colors

Lead #37648B Secondary #7F4438 Surface #E1DDC0 Accent #375245 Anchor #57233C

Lapis Lazuli 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 #37648B Secondary #7B8B99 Support #969386 Ink #16140F

Lapis Lazuli 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 Lapis Lazuli carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #37648B 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 27/100

Cool

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

Softness 44/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 50/100

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 53/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 56/100

Moderate

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

Brand distinctiveness 22/100

Low

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

UI accent fit 84/100

Very high

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

Surface fit 29/100

Low

Too saturated or mid-toned for big areas — keep it to accents.

Print safety 82/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #37648B

For UI

For branding

For interior

For fashion

People also use #37648B with

Light Sea Green Dark Slate Blue Raw Umber Gainsboro Charcoal

UI roles & guardrails

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

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 6.3:1. Use

Subtle surface Use #D6E0E9 for cards and hover fills. Tint 80

Avoid beside #37488B — 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 #37648B 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: #37648B;
  --color-base-rgb: 55 100 139;
  --color-base-oklch: oklch(48.9% 0.080 246.5);
  --color-50: #F4F8FB;
  --color-100: #E1EBF4;
  --color-200: #C5D7E8;
  --color-300: #9CB9D3;
  --color-400: #759BBD;
  --color-500: #557DA0;
  --color-600: #46637C;
  --color-700: #364959;
  --color-800: #26313B;
  --color-900: #191F24;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  lapis-lazuli: {
    50: '#F4F8FB',
    100: '#E1EBF4',
    200: '#C5D7E8',
    300: '#9CB9D3',
    400: '#759BBD',
    500: '#557DA0',
    600: '#46637C',
    700: '#364959',
    800: '#26313B',
    900: '#191F24',
  },
}

$base: #37648B;
$base-ink: #FFFFFF;
$base-50: #F4F8FB;
$base-100: #E1EBF4;
$base-200: #C5D7E8;
$base-300: #9CB9D3;
$base-400: #759BBD;
$base-500: #557DA0;
$base-600: #46637C;
$base-700: #364959;
$base-800: #26313B;
$base-900: #191F24;
$base-hover: #2C506F;
$base-subtle: #C0D1DF;

{
    "color": {
        "base": {
            "value": "#37648B",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F8FB",
                "type": "color"
            },
            "100": {
                "value": "#E1EBF4",
                "type": "color"
            },
            "200": {
                "value": "#C5D7E8",
                "type": "color"
            },
            "300": {
                "value": "#9CB9D3",
                "type": "color"
            },
            "400": {
                "value": "#759BBD",
                "type": "color"
            },
            "500": {
                "value": "#557DA0",
                "type": "color"
            },
            "600": {
                "value": "#46637C",
                "type": "color"
            },
            "700": {
                "value": "#364959",
                "type": "color"
            },
            "800": {
                "value": "#26313B",
                "type": "color"
            },
            "900": {
                "value": "#191F24",
                "type": "color"
            }
        }
    }
}

Palettes built on #37648B

Color Lab

Pairs with #37648B

UI roles & guardrails

In real applications

Scales

Every model

Export