What color is #103F5B?

#103F5B is a dark, vivid cyan-blue. In RGB it is rgb(16, 63, 91), and in HSL hsl(202, 70%, 21%).

Is #103F5B accessible as text?

On white, #103F5B has a contrast ratio of 11.15:1 (passes WCAG AA for body text); on black it is 1.88:1 (fails). For text placed on #103F5B, use white for the best readability.

What is the closest Tailwind color to #103F5B?

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

What colors go well with #103F5B?

#103F5B pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #5B2C10. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #103F5B below.

Is #103F5B good for buttons?

#103F5B works well for buttons and highlights, but use white text on #103F5B — black text only reaches 1.88:1, below the 4.5:1 needed for normal-size labels.

Is #103F5B the same as CSS darkslategray?

No — #103F5B is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#103F5B Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #103F5B

Not just a swatch — here's how #103F5B works with other colors. Named schemes with #103F5B in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #103F5B Accent #A5C4C0 Surface #DEDABF Secondary #9AA0A0 Anchor #1F344A

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 #103F5B Secondary #AEB4B8 Surface #F1F2F0 Support #7C93A6 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 #103F5B Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #39607B

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 #103F5B Secondary #7F4439 Surface #E2DDC0 Accent #385245 Anchor #57233C

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 #103F5B Secondary #55636D Support #969386 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 #103F5B 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 30/100

Cool

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

Softness 34/100

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 38/100

Low

A faint retro warmth without tipping into sepia.

Luxury 67/100

High

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

Brand distinctiveness 27/100

Low

Quiet and neutral — a supporting tone, not a signature.

UI accent fit 47/100

Moderate

Workable accent with care around contrast.

Surface fit 41/100

Moderate

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 #103F5B

For UI

For branding

For interior

For fashion

People also use #103F5B with

Pine Green Navy Espresso Platinum 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 11.1:1. Use

Subtle surface Use #C2DCEB for cards and hover fills. Tint 80

Avoid beside #10275B — 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 #103F5B 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: #103F5B;
  --color-base-rgb: 16 63 91;
  --color-base-oklch: oklch(35.1% 0.069 239.7);
  --color-50: #F1F9FD;
  --color-100: #DBEFFA;
  --color-200: #BADEF3;
  --color-300: #8AC4E5;
  --color-400: #5FA8D3;
  --color-500: #3D8BB8;
  --color-600: #356D8C;
  --color-700: #2B4F64;
  --color-800: #203541;
  --color-900: #152128;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  yale-blue: {
    50: '#F1F9FD',
    100: '#DBEFFA',
    200: '#BADEF3',
    300: '#8AC4E5',
    400: '#5FA8D3',
    500: '#3D8BB8',
    600: '#356D8C',
    700: '#2B4F64',
    800: '#203541',
    900: '#152128',
  },
}

$base: #103F5B;
$base-ink: #FFFFFF;
$base-50: #F1F9FD;
$base-100: #DBEFFA;
$base-200: #BADEF3;
$base-300: #8AC4E5;
$base-400: #5FA8D3;
$base-500: #3D8BB8;
$base-600: #356D8C;
$base-700: #2B4F64;
$base-800: #203541;
$base-900: #152128;
$base-hover: #0D3349;
$base-subtle: #A2CBE3;

{
    "color": {
        "base": {
            "value": "#103F5B",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F9FD",
                "type": "color"
            },
            "100": {
                "value": "#DBEFFA",
                "type": "color"
            },
            "200": {
                "value": "#BADEF3",
                "type": "color"
            },
            "300": {
                "value": "#8AC4E5",
                "type": "color"
            },
            "400": {
                "value": "#5FA8D3",
                "type": "color"
            },
            "500": {
                "value": "#3D8BB8",
                "type": "color"
            },
            "600": {
                "value": "#356D8C",
                "type": "color"
            },
            "700": {
                "value": "#2B4F64",
                "type": "color"
            },
            "800": {
                "value": "#203541",
                "type": "color"
            },
            "900": {
                "value": "#152128",
                "type": "color"
            }
        }
    }
}