What color is #233F71?

#233F71 is a dark blue. In RGB it is rgb(35, 63, 113), and in HSL hsl(218, 53%, 29%).

Is #233F71 accessible as text?

On white, #233F71 has a contrast ratio of 10.39:1 (passes WCAG AA for body text); on black it is 2.02:1 (fails). For text placed on #233F71, use white for the best readability.

What is the closest Tailwind color to #233F71?

The nearest Tailwind CSS token is sky-900 (#024A70).

What colors go well with #233F71?

#233F71 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #715423. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #233F71 below.

Is #233F71 good for buttons?

#233F71 works well for buttons and highlights, but use white text on #233F71 — black text only reaches 2.02:1, below the 4.5:1 needed for normal-size labels.

Is #233F71 the same as CSS darkslateblue?

No — #233F71 is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#233F71 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #233F71

Not just a swatch — here's how #233F71 works with other colors. Named schemes with #233F71 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #233F71 Accent #A5C4C1 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.

Luxury Packaging Feature · 5 colors

Feature #233F71 Anchor #141210 Accent #ADAE53 Secondary #232933 Surface #F0EEE3

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 #233F71 Anchor #2A2A2E Secondary #6E6E74 Surface #E9E7DA Accent #1C1E41

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.

Vintage Leather Lead · 5 colors

Lead #233F71 Secondary #7F4536 Surface #E1DDC1 Accent #375246 Anchor #57223A

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 #233F71 Secondary #5D687A 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 #233F71 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 26/100

Cool

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

Softness 33/100

Low

Middle-weight — neither delicate nor heavy.

Depth 62/100

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 45/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 67/100

High

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

Brand distinctiveness 36/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 60/100

Moderate

Workable accent with care around contrast.

Surface fit 33/100

Low

Usable as a tinted surface in measured doses.

Print safety 82/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #233F71

For UI

For branding

For interior

For fashion

People also use #233F71 with

Dark Cyan Midnight 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 10.4:1. Use

Subtle surface Use #CDD7E9 for cards and hover fills. Tint 80

Avoid beside #232571 — 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 #233F71 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: #233F71;
  --color-base-rgb: 35 63 113;
  --color-base-oklch: oklch(37.3% 0.093 261.1);
  --color-50: #F3F6FC;
  --color-100: #DFE8F6;
  --color-200: #C1D0EC;
  --color-300: #95AEDA;
  --color-400: #6D8DC5;
  --color-500: #4C6EA9;
  --color-600: #405882;
  --color-700: #32425D;
  --color-800: #242D3D;
  --color-900: #171D26;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  classic-blue: {
    50: '#F3F6FC',
    100: '#DFE8F6',
    200: '#C1D0EC',
    300: '#95AEDA',
    400: '#6D8DC5',
    500: '#4C6EA9',
    600: '#405882',
    700: '#32425D',
    800: '#242D3D',
    900: '#171D26',
  },
}

$base: #233F71;
$base-ink: #FFFFFF;
$base-50: #F3F6FC;
$base-100: #DFE8F6;
$base-200: #C1D0EC;
$base-300: #95AEDA;
$base-400: #6D8DC5;
$base-500: #4C6EA9;
$base-600: #405882;
$base-700: #32425D;
$base-800: #242D3D;
$base-900: #171D26;
$base-hover: #1C335B;
$base-subtle: #B3C3DF;

{
    "color": {
        "base": {
            "value": "#233F71",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F6FC",
                "type": "color"
            },
            "100": {
                "value": "#DFE8F6",
                "type": "color"
            },
            "200": {
                "value": "#C1D0EC",
                "type": "color"
            },
            "300": {
                "value": "#95AEDA",
                "type": "color"
            },
            "400": {
                "value": "#6D8DC5",
                "type": "color"
            },
            "500": {
                "value": "#4C6EA9",
                "type": "color"
            },
            "600": {
                "value": "#405882",
                "type": "color"
            },
            "700": {
                "value": "#32425D",
                "type": "color"
            },
            "800": {
                "value": "#242D3D",
                "type": "color"
            },
            "900": {
                "value": "#171D26",
                "type": "color"
            }
        }
    }
}