What color is #233E7B?

#233E7B is a dark blue. In RGB it is rgb(35, 62, 123), and in HSL hsl(222, 56%, 31%).

Is #233E7B accessible as text?

On white, #233E7B has a contrast ratio of 10.26:1 (passes WCAG AA for body text); on black it is 2.05:1 (fails). For text placed on #233E7B, use white for the best readability.

What is the closest Tailwind color to #233E7B?

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

What colors go well with #233E7B?

#233E7B pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #7B6123. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #233E7B below.

Is #233E7B good for buttons?

#233E7B works well for buttons and highlights, but use white text on #233E7B — black text only reaches 2.05:1, below the 4.5:1 needed for normal-size labels.

Is #233E7B the same as CSS darkslateblue?

No — #233E7B is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#233E7B Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #233E7B

Not just a swatch — here's how #233E7B works with other colors. Named schemes with #233E7B in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #233E7B Anchor #141210 Accent #ACAE53 Secondary #242933 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 #233E7B Anchor #2A2A2E Secondary #6E6E74 Surface #E9E7DA Accent #1F1D47

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 #233E7B 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 #233E7B Secondary #7F4536 Surface #EED7C2 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 #233E7B Secondary #5D697F 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 #233E7B 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 23/100

Cool

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

Softness 32/100

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 42/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 68/100

High

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

Brand distinctiveness 42/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 64/100

High

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

Surface fit 27/100

Low

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

Print safety 80/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #233E7B

For UI

For branding

For interior

For fashion

People also use #233E7B with

Dark Cyan 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 10.3:1. Use

Subtle surface Use #CED6EA for cards and hover fills. Tint 80

Avoid beside #26237B — 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 #233E7B at work across the surfaces designers actually ship.

Website / UI

Northwind Sign up

Build faster.

A working theme, generated in seconds.

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: #233E7B;
  --color-base-rgb: 35 62 123;
  --color-base-oklch: oklch(37.8% 0.109 264.0);
  --color-50: #F3F5FC;
  --color-100: #DFE6F7;
  --color-200: #BFCDED;
  --color-300: #93A9DC;
  --color-400: #6B86C7;
  --color-500: #4967AC;
  --color-600: #3E5384;
  --color-700: #313E5E;
  --color-800: #232B3E;
  --color-900: #171C26;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  classic-blue: {
    50: '#F3F5FC',
    100: '#DFE6F7',
    200: '#BFCDED',
    300: '#93A9DC',
    400: '#6B86C7',
    500: '#4967AC',
    600: '#3E5384',
    700: '#313E5E',
    800: '#232B3E',
    900: '#171C26',
  },
}

$base: #233E7B;
$base-ink: #FFFFFF;
$base-50: #F3F5FC;
$base-100: #DFE6F7;
$base-200: #BFCDED;
$base-300: #93A9DC;
$base-400: #6B86C7;
$base-500: #4967AC;
$base-600: #3E5384;
$base-700: #313E5E;
$base-800: #232B3E;
$base-900: #171C26;
$base-hover: #1C3163;
$base-subtle: #B4C1E1;

{
    "color": {
        "base": {
            "value": "#233E7B",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F5FC",
                "type": "color"
            },
            "100": {
                "value": "#DFE6F7",
                "type": "color"
            },
            "200": {
                "value": "#BFCDED",
                "type": "color"
            },
            "300": {
                "value": "#93A9DC",
                "type": "color"
            },
            "400": {
                "value": "#6B86C7",
                "type": "color"
            },
            "500": {
                "value": "#4967AC",
                "type": "color"
            },
            "600": {
                "value": "#3E5384",
                "type": "color"
            },
            "700": {
                "value": "#313E5E",
                "type": "color"
            },
            "800": {
                "value": "#232B3E",
                "type": "color"
            },
            "900": {
                "value": "#171C26",
                "type": "color"
            }
        }
    }
}

Palettes built on #233E7B

Color Lab

Pairs with #233E7B

UI roles & guardrails

In real applications

Scales

Every model

Export