What color is #173B63?

#173B63 is a dark blue. In RGB it is rgb(23, 59, 99), and in HSL hsl(212, 62%, 24%).

Is #173B63 accessible as text?

On white, #173B63 has a contrast ratio of 11.40:1 (passes WCAG AA for body text); on black it is 1.84:1 (fails). For text placed on #173B63, use white for the best readability.

What is the closest Tailwind color to #173B63?

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

What colors go well with #173B63?

#173B63 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #634017. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #173B63 below.

Is #173B63 good for buttons?

#173B63 works well for buttons and highlights, but use white text on #173B63 — black text only reaches 1.84:1, below the 4.5:1 needed for normal-size labels.

Is #173B63 the same as CSS darkslategray?

No — #173B63 is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#173B63 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #173B63

Not just a swatch — here's how #173B63 works with other colors. Named schemes with #173B63 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #173B63 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.

Nordic Calm Accent · 5 colors

Accent #173B63 Secondary #AEB4B8 Surface #F1F2F0 Support #7D93A6 Anchor #2E3236

Yale Blue 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 #173B63 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #3C5C83

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

Vintage Leather Lead · 5 colors

Lead #173B63 Secondary #7F4537 Surface #E1DDC1 Accent #375246 Anchor #57233B

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 #173B63 Secondary #556170 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 #173B63 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 28/100

Cool

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

Softness 32/100

Low

Middle-weight — neither delicate nor heavy.

Depth 64/100

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 41/100

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 31/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 49/100

Moderate

Workable accent with care around contrast.

Surface fit 38/100

Low

Usable as a tinted surface in measured doses.

Print safety 83/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #173B63

For UI

For branding

For interior

For fashion

People also use #173B63 with

Teal Green Midnight Blue Sepia 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 11.4:1. Use

Subtle surface Use #C7D7EA for cards and hover fills. Tint 80

Avoid beside #172163 — 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 #173B63 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: #173B63;
  --color-base-rgb: 23 59 99;
  --color-base-oklch: oklch(34.8% 0.081 253.2);
  --color-50: #F2F7FD;
  --color-100: #DDEAF8;
  --color-200: #BDD5EF;
  --color-300: #90B5E0;
  --color-400: #6696CC;
  --color-500: #4477B1;
  --color-600: #3A5E87;
  --color-700: #2E4660;
  --color-800: #222F3F;
  --color-900: #161E27;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  yale-blue: {
    50: '#F2F7FD',
    100: '#DDEAF8',
    200: '#BDD5EF',
    300: '#90B5E0',
    400: '#6696CC',
    500: '#4477B1',
    600: '#3A5E87',
    700: '#2E4660',
    800: '#222F3F',
    900: '#161E27',
  },
}

$base: #173B63;
$base-ink: #FFFFFF;
$base-50: #F2F7FD;
$base-100: #DDEAF8;
$base-200: #BDD5EF;
$base-300: #90B5E0;
$base-400: #6696CC;
$base-500: #4477B1;
$base-600: #3A5E87;
$base-700: #2E4660;
$base-800: #222F3F;
$base-900: #161E27;
$base-hover: #132F4F;
$base-subtle: #A9C3E0;

{
    "color": {
        "base": {
            "value": "#173B63",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F7FD",
                "type": "color"
            },
            "100": {
                "value": "#DDEAF8",
                "type": "color"
            },
            "200": {
                "value": "#BDD5EF",
                "type": "color"
            },
            "300": {
                "value": "#90B5E0",
                "type": "color"
            },
            "400": {
                "value": "#6696CC",
                "type": "color"
            },
            "500": {
                "value": "#4477B1",
                "type": "color"
            },
            "600": {
                "value": "#3A5E87",
                "type": "color"
            },
            "700": {
                "value": "#2E4660",
                "type": "color"
            },
            "800": {
                "value": "#222F3F",
                "type": "color"
            },
            "900": {
                "value": "#161E27",
                "type": "color"
            }
        }
    }
}