What color is #233F55?

#233F55 is a dark cyan-blue. In RGB it is rgb(35, 63, 85), and in HSL hsl(206, 42%, 24%).

Is #233F55 accessible as text?

On white, #233F55 has a contrast ratio of 10.97:1 (passes WCAG AA for body text); on black it is 1.91:1 (fails). For text placed on #233F55, use white for the best readability.

What is the closest Tailwind color to #233F55?

The nearest Tailwind CSS token is mist-700 (#394447).

What colors go well with #233F55?

#233F55 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #573A23. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #233F55 below.

Is #233F55 good for buttons?

#233F55 works well for buttons and highlights, but use white text on #233F55 — black text only reaches 1.91:1, below the 4.5:1 needed for normal-size labels.

Is #233F55 the same as CSS darkslategray?

No — #233F55 is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#233F55 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #233F55

Not just a swatch — here's how #233F55 works with other colors. Named schemes with #233F55 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #233F55 Accent #A5C4C0 Surface #DEDBBF Secondary #9AA0A0 Anchor #20344A

Charcoal 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 #233F55 Secondary #AEB4B8 Surface #F1F2F0 Support #7C93A6 Anchor #2E3236

Charcoal 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 #233F55 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #466075

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

Vintage Leather Lead · 5 colors

Lead #233F55 Secondary #7F4438 Surface #E1DDC0 Accent #375245 Anchor #57233C

Charcoal 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 #233F55 Secondary #5A636C Support #969386 Ink #16140F

Charcoal 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 Charcoal carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #233F55 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 35/100

Cool

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

Softness 35/100

Low

Middle-weight — neither delicate nor heavy.

Depth 62/100

High

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

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 65/100

High

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

Brand distinctiveness 20/100

Very low

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

UI accent fit 43/100

Moderate

Workable accent with care around contrast.

Surface fit 46/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 88/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #233F55

For UI

For branding

For interior

For fashion

People also use #233F55 with

Myrtle Green Russian Violet 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 11.0:1. Use

Subtle surface Use #CDDAE4 for cards and hover fills. Tint 80

Avoid beside #232F57 — 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 #233F55 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: #233F55;
  --color-base-rgb: 35 63 85;
  --color-base-oklch: oklch(35.6% 0.051 243.6);
  --color-50: #F4F8FB;
  --color-100: #E2ECF4;
  --color-200: #C5D8E7;
  --color-300: #9CBBD3;
  --color-400: #769EBC;
  --color-500: #557F9F;
  --color-600: #47647B;
  --color-700: #364A58;
  --color-800: #26323B;
  --color-900: #191F24;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  charcoal: {
    50: '#F4F8FB',
    100: '#E2ECF4',
    200: '#C5D8E7',
    300: '#9CBBD3',
    400: '#769EBC',
    500: '#557F9F',
    600: '#47647B',
    700: '#364A58',
    800: '#26323B',
    900: '#191F24',
  },
}

$base: #233F55;
$base-ink: #FFFFFF;
$base-50: #F4F8FB;
$base-100: #E2ECF4;
$base-200: #C5D8E7;
$base-300: #9CBBD3;
$base-400: #769EBC;
$base-500: #557F9F;
$base-600: #47647B;
$base-700: #364A58;
$base-800: #26323B;
$base-900: #191F24;
$base-hover: #1C3446;
$base-subtle: #B2C7D7;

{
    "color": {
        "base": {
            "value": "#233F55",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F8FB",
                "type": "color"
            },
            "100": {
                "value": "#E2ECF4",
                "type": "color"
            },
            "200": {
                "value": "#C5D8E7",
                "type": "color"
            },
            "300": {
                "value": "#9CBBD3",
                "type": "color"
            },
            "400": {
                "value": "#769EBC",
                "type": "color"
            },
            "500": {
                "value": "#557F9F",
                "type": "color"
            },
            "600": {
                "value": "#47647B",
                "type": "color"
            },
            "700": {
                "value": "#364A58",
                "type": "color"
            },
            "800": {
                "value": "#26323B",
                "type": "color"
            },
            "900": {
                "value": "#191F24",
                "type": "color"
            }
        }
    }
}