What color is #233D80?

#233D80 is a dark blue. In RGB it is rgb(35, 61, 128), and in HSL hsl(223, 57%, 32%).

Is #233D80 accessible as text?

On white, #233D80 has a contrast ratio of 10.24:1 (passes WCAG AA for body text); on black it is 2.05:1 (fails). For text placed on #233D80, use white for the best readability.

What is the closest Tailwind color to #233D80?

The nearest Tailwind CSS token is blue-900 (#1C398E).

What colors go well with #233D80?

#233D80 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #806623. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #233D80 below.

Is #233D80 good for buttons?

#233D80 works well for buttons and highlights, but use white text on #233D80 — black text only reaches 2.05:1, below the 4.5:1 needed for normal-size labels.

Is #233D80 the same as CSS darkslateblue?

No — #233D80 is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#233D80 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #233D80

Not just a swatch — here's how #233D80 works with other colors. Named schemes with #233D80 in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #233D80 Anchor #141210 Accent #DD965A Secondary #242933 Surface #F4ECE3

Classic Blue carries the depth in this luxury scheme, offset by a brass accent and near-black and held together by a deep neutral and an off-white surface.

Moody Editorial Color · 5 colors

Color #233D80 Anchor #2A2A2E Secondary #6E6E74 Surface #EEE5DB Accent #201C4A

Classic Blue adds the colour to this moody editorial scheme — charcoal and a mid-grey around it, a bone highlight, and a muted jewel accent drawn from Classic Blue.

Coastal Morning Lead · 5 colors

Lead #233D80 Accent #A5C4C2 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

Classic Blue opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.

Vintage Leather Lead · 5 colors

Lead #233D80 Secondary #7F4536 Surface #EED7C2 Accent #365246 Anchor #58223A

Classic 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 #F8F4EF Accent #233D80 Secondary #5D6981 Support #9D8F88 Ink #18140F

Classic 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 Classic Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #233D80 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 21/100

Cool

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

Softness 32/100

Low

Firm and assertive — carries weight and contrast.

Depth 63/100

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 40/100

Low

A faint retro warmth without tipping into sepia.

Luxury 68/100

High

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

Brand distinctiveness 45/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 66/100

High

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

Surface fit 25/100

Low

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

Print safety 79/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #233D80

For UI

For branding

For interior

For fashion

People also use #233D80 with

Bondi Blue Indigo Raw Umber 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 10.2:1. Use

Subtle surface Use #CED6EB for cards and hover fills. Tint 80

Avoid beside #282380 — 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 #233D80 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: #233D80;
  --color-base-rgb: 35 61 128;
  --color-base-oklch: oklch(38.0% 0.118 265.2);
  --color-50: #F3F5FC;
  --color-100: #DEE5F7;
  --color-200: #BFCCED;
  --color-300: #93A8DC;
  --color-400: #6A85C8;
  --color-500: #4865AD;
  --color-600: #3D5284;
  --color-700: #303D5E;
  --color-800: #232B3E;
  --color-900: #171B26;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  classic-blue: {
    50: '#F3F5FC',
    100: '#DEE5F7',
    200: '#BFCCED',
    300: '#93A8DC',
    400: '#6A85C8',
    500: '#4865AD',
    600: '#3D5284',
    700: '#303D5E',
    800: '#232B3E',
    900: '#171B26',
  },
}

$base: #233D80;
$base-ink: #FFFFFF;
$base-50: #F3F5FC;
$base-100: #DEE5F7;
$base-200: #BFCCED;
$base-300: #93A8DC;
$base-400: #6A85C8;
$base-500: #4865AD;
$base-600: #3D5284;
$base-700: #303D5E;
$base-800: #232B3E;
$base-900: #171B26;
$base-hover: #1C3166;
$base-subtle: #B4C1E2;

{
    "color": {
        "base": {
            "value": "#233D80",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F5FC",
                "type": "color"
            },
            "100": {
                "value": "#DEE5F7",
                "type": "color"
            },
            "200": {
                "value": "#BFCCED",
                "type": "color"
            },
            "300": {
                "value": "#93A8DC",
                "type": "color"
            },
            "400": {
                "value": "#6A85C8",
                "type": "color"
            },
            "500": {
                "value": "#4865AD",
                "type": "color"
            },
            "600": {
                "value": "#3D5284",
                "type": "color"
            },
            "700": {
                "value": "#303D5E",
                "type": "color"
            },
            "800": {
                "value": "#232B3E",
                "type": "color"
            },
            "900": {
                "value": "#171B26",
                "type": "color"
            }
        }
    }
}

Palettes built on #233D80

Color Lab

Pairs with #233D80

UI roles & guardrails

In real applications

Scales

Every model

Export