What color is #123751?

#123751 is a dark cyan-blue. In RGB it is rgb(18, 55, 81), and in HSL hsl(205, 64%, 19%).

Is #123751 accessible as text?

On white, #123751 has a contrast ratio of 12.42:1 (passes WCAG AA for body text); on black it is 1.69:1 (fails). For text placed on #123751, use white for the best readability.

What is the closest Tailwind color to #123751?

The nearest Tailwind CSS token is cyan-950 (#053345).

What colors go well with #123751?

#123751 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #4F2B11. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #123751 below.

Is #123751 good for buttons?

#123751 works well for buttons and highlights, but use white text on #123751 — black text only reaches 1.69:1, below the 4.5:1 needed for normal-size labels.

Is #123751 the same as CSS darkslategray?

No — #123751 is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#123751 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #123751

Not just a swatch — here's how #123751 works with other colors. Named schemes with #123751 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #123751 Accent #A5C4C0 Surface #DEDBBF Secondary #9AA0A0 Anchor #1F344A

Prussian 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 #123751 Secondary #AEB4B8 Surface #F1F2F0 Support #7C93A6 Anchor #2E3236

Prussian 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 #123751 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #375770

Prussian 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 Prussian Blue.

Vintage Leather Lead · 5 colors

Lead #123751 Secondary #7F4438 Surface #E2DDC0 Accent #375245 Anchor #57233C

Prussian Blue 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 #123751 Secondary #4F5B65 Support #969386 Ink #16140F

Prussian 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 Prussian Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #123751 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 32/100

Cool

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

Softness 32/100

Low

Firm and assertive — carries weight and contrast.

Depth 65/100

High

Deep and grounding — anchors a layout, strong dark-mode base.

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 34/100

Low

A faint retro warmth without tipping into sepia.

Luxury 69/100

High

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

Brand distinctiveness 24/100

Low

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

UI accent fit 37/100

Low

Workable accent with care around contrast.

Surface fit 45/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 85/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #123751

For UI

For branding

For interior

For fashion

People also use #123751 with

Pine Green Navy Espresso 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 12.4:1. Use

Subtle surface Use #C3D9E9 for cards and hover fills. Tint 80

Avoid beside #11214F — 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 #123751 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: #123751;
  --color-base-rgb: 18 55 81;
  --color-base-oklch: oklch(32.4% 0.062 242.9);
  --color-50: #F2F8FD;
  --color-100: #DDEDF8;
  --color-200: #BCDBF0;
  --color-300: #8EBEE1;
  --color-400: #64A2CE;
  --color-500: #4284B3;
  --color-600: #396889;
  --color-700: #2E4C61;
  --color-800: #213340;
  --color-900: #162027;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  prussian-blue: {
    50: '#F2F8FD',
    100: '#DDEDF8',
    200: '#BCDBF0',
    300: '#8EBEE1',
    400: '#64A2CE',
    500: '#4284B3',
    600: '#396889',
    700: '#2E4C61',
    800: '#213340',
    900: '#162027',
  },
}

$base: #123751;
$base-ink: #FFFFFF;
$base-50: #F2F8FD;
$base-100: #DDEDF8;
$base-200: #BCDBF0;
$base-300: #8EBEE1;
$base-400: #64A2CE;
$base-500: #4284B3;
$base-600: #396889;
$base-700: #2E4C61;
$base-800: #213340;
$base-900: #162027;
$base-hover: #0E2B40;
$base-subtle: #A3C6DF;

{
    "color": {
        "base": {
            "value": "#123751",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F8FD",
                "type": "color"
            },
            "100": {
                "value": "#DDEDF8",
                "type": "color"
            },
            "200": {
                "value": "#BCDBF0",
                "type": "color"
            },
            "300": {
                "value": "#8EBEE1",
                "type": "color"
            },
            "400": {
                "value": "#64A2CE",
                "type": "color"
            },
            "500": {
                "value": "#4284B3",
                "type": "color"
            },
            "600": {
                "value": "#396889",
                "type": "color"
            },
            "700": {
                "value": "#2E4C61",
                "type": "color"
            },
            "800": {
                "value": "#213340",
                "type": "color"
            },
            "900": {
                "value": "#162027",
                "type": "color"
            }
        }
    }
}