What color is #10366E?

#10366E is a dark, vivid blue. In RGB it is rgb(16, 54, 110), and in HSL hsl(216, 75%, 25%).

Is #10366E accessible as text?

On white, #10366E has a contrast ratio of 11.83:1 (passes WCAG AA for body text); on black it is 1.77:1 (fails). For text placed on #10366E, use white for the best readability.

What is the closest Tailwind color to #10366E?

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

What colors go well with #10366E?

#10366E pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #704910. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #10366E below.

Is #10366E good for buttons?

#10366E works well for buttons and highlights, but use white text on #10366E — black text only reaches 1.77:1, below the 4.5:1 needed for normal-size labels.

Is #10366E the same as CSS midnightblue?

No — #10366E is not the CSS named color midnightblue, but midnightblue (#191970) is the closest CSS named color.

#10366E Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #10366E

Not just a swatch — here's how #10366E works with other colors. Named schemes with #10366E in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #10366E Anchor #141210 Accent #ADAE53 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 #10366E Anchor #2A2A2E Secondary #6E6E74 Surface #E9E7DA Accent #13153C

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.

Coastal Morning Lead · 5 colors

Lead #10366E 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.

Vintage Leather Lead · 5 colors

Lead #10366E Secondary #7F4536 Surface #E1DDC1 Accent #375246 Anchor #57223A

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 #10366E Secondary #515F73 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.

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Color Lab

How #10366E 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 22/100

Cool

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

Softness 30/100

Low

Firm and assertive — carries weight and contrast.

Depth 66/100

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 39/100

Low

A faint retro warmth without tipping into sepia.

Luxury 71/100

High

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

Brand distinctiveness 41/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 52/100

Moderate

Workable accent with care around contrast.

Surface fit 30/100

Low

Usable as a tinted surface in measured doses.

Print safety 79/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #10366E

For UI

For branding

For interior

For fashion

People also use #10366E with

Dark Cyan 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 11.8:1. Use

Subtle surface Use #C4D5ED for cards and hover fills. Tint 80

Avoid beside #101670 — 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 #10366E 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: #10366E;
  --color-base-rgb: 16 54 110;
  --color-base-oklch: oklch(34.1% 0.106 258.6);
  --color-50: #F1F6FE;
  --color-100: #DAE7FB;
  --color-200: #B8D0F5;
  --color-300: #87AEE8;
  --color-400: #5B8DD7;
  --color-500: #386DBC;
  --color-600: #325890;
  --color-700: #294166;
  --color-800: #1E2D42;
  --color-900: #141D29;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  yale-blue: {
    50: '#F1F6FE',
    100: '#DAE7FB',
    200: '#B8D0F5',
    300: '#87AEE8',
    400: '#5B8DD7',
    500: '#386DBC',
    600: '#325890',
    700: '#294166',
    800: '#1E2D42',
    900: '#141D29',
  },
}

$base: #10366E;
$base-ink: #FFFFFF;
$base-50: #F1F6FE;
$base-100: #DAE7FB;
$base-200: #B8D0F5;
$base-300: #87AEE8;
$base-400: #5B8DD7;
$base-500: #386DBC;
$base-600: #325890;
$base-700: #294166;
$base-800: #1E2D42;
$base-900: #141D29;
$base-hover: #0D2B59;
$base-subtle: #A5BFE6;

{
    "color": {
        "base": {
            "value": "#10366E",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F6FE",
                "type": "color"
            },
            "100": {
                "value": "#DAE7FB",
                "type": "color"
            },
            "200": {
                "value": "#B8D0F5",
                "type": "color"
            },
            "300": {
                "value": "#87AEE8",
                "type": "color"
            },
            "400": {
                "value": "#5B8DD7",
                "type": "color"
            },
            "500": {
                "value": "#386DBC",
                "type": "color"
            },
            "600": {
                "value": "#325890",
                "type": "color"
            },
            "700": {
                "value": "#294166",
                "type": "color"
            },
            "800": {
                "value": "#1E2D42",
                "type": "color"
            },
            "900": {
                "value": "#141D29",
                "type": "color"
            }
        }
    }
}

Palettes built on #10366E

Color Lab

Pairs with #10366E

UI roles & guardrails

In real applications

Scales

Every model

Export