What color is #173E73?

#173E73 is a dark blue. In RGB it is rgb(23, 62, 115), and in HSL hsl(215, 67%, 27%).

Is #173E73 accessible as text?

On white, #173E73 has a contrast ratio of 10.64:1 (passes WCAG AA for body text); on black it is 1.97:1 (fails). For text placed on #173E73, use white for the best readability.

What is the closest Tailwind color to #173E73?

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

What colors go well with #173E73?

#173E73 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #734D17. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #173E73 below.

Is #173E73 good for buttons?

#173E73 works well for buttons and highlights, but use white text on #173E73 — black text only reaches 1.97:1, below the 4.5:1 needed for normal-size labels.

Is #173E73 the same as CSS darkslateblue?

No — #173E73 is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#173E73 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #173E73

Not just a swatch — here's how #173E73 works with other colors. Named schemes with #173E73 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #173E73 Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

Yale 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 #173E73 Anchor #141210 Accent #AEAE53 Secondary #232933 Surface #F0EEE3

Yale 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 #173E73 Anchor #2A2A2E Secondary #6E6E74 Surface #E9E7DA Accent #181C42

Yale 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 Yale Blue.

Vintage Leather Lead · 5 colors

Lead #173E73 Secondary #7F4537 Surface #E1DDC1 Accent #375246 Anchor #57223B

Yale 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 #173E73 Secondary #59667A Support #9D8F89 Ink #16140F

Yale 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 Yale Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #173E73 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 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 42/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 69/100

High

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

Brand distinctiveness 39/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 59/100

Moderate

Workable accent with care around contrast.

Surface fit 30/100

Low

Usable as a tinted surface in measured doses.

Print safety 80/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #173E73

For UI

For branding

For interior

For fashion

People also use #173E73 with

Dark Cyan Midnight Blue Russet 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 10.6:1. Use

Subtle surface Use #C8D7EC for cards and hover fills. Tint 80

Avoid beside #171E73 — 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 #173E73 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: #173E73;
  --color-base-rgb: 23 62 115;
  --color-base-oklch: oklch(36.7% 0.101 257.1);
  --color-50: #F2F6FD;
  --color-100: #DCE8F9;
  --color-200: #BBD2F1;
  --color-300: #8CB0E3;
  --color-400: #6290D0;
  --color-500: #3F71B5;
  --color-600: #375A8B;
  --color-700: #2C4362;
  --color-800: #202E41;
  --color-900: #161D28;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  yale-blue: {
    50: '#F2F6FD',
    100: '#DCE8F9',
    200: '#BBD2F1',
    300: '#8CB0E3',
    400: '#6290D0',
    500: '#3F71B5',
    600: '#375A8B',
    700: '#2C4362',
    800: '#202E41',
    900: '#161D28',
  },
}

$base: #173E73;
$base-ink: #FFFFFF;
$base-50: #F2F6FD;
$base-100: #DCE8F9;
$base-200: #BBD2F1;
$base-300: #8CB0E3;
$base-400: #6290D0;
$base-500: #3F71B5;
$base-600: #375A8B;
$base-700: #2C4362;
$base-800: #202E41;
$base-900: #161D28;
$base-hover: #12315C;
$base-subtle: #ABC2E4;

{
    "color": {
        "base": {
            "value": "#173E73",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F6FD",
                "type": "color"
            },
            "100": {
                "value": "#DCE8F9",
                "type": "color"
            },
            "200": {
                "value": "#BBD2F1",
                "type": "color"
            },
            "300": {
                "value": "#8CB0E3",
                "type": "color"
            },
            "400": {
                "value": "#6290D0",
                "type": "color"
            },
            "500": {
                "value": "#3F71B5",
                "type": "color"
            },
            "600": {
                "value": "#375A8B",
                "type": "color"
            },
            "700": {
                "value": "#2C4362",
                "type": "color"
            },
            "800": {
                "value": "#202E41",
                "type": "color"
            },
            "900": {
                "value": "#161D28",
                "type": "color"
            }
        }
    }
}

Palettes built on #173E73

Color Lab

Pairs with #173E73

UI roles & guardrails

In real applications

Scales

Every model

Export