What color is #10039B?

#10039B is a dark, vivid blue. In RGB it is rgb(16, 3, 155), and in HSL hsl(245, 96%, 31%).

Is #10039B accessible as text?

On white, #10039B has a contrast ratio of 13.92:1 (passes WCAG AA for body text); on black it is 1.51:1 (fails). For text placed on #10039B, use white for the best readability.

What is the closest Tailwind color to #10039B?

The nearest Tailwind CSS token is indigo-900 (#312C85).

What colors go well with #10039B?

#10039B pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #8E9B03. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #10039B below.

Is #10039B good for buttons?

#10039B works well for buttons and highlights, but use white text on #10039B — black text only reaches 1.51:1, below the 4.5:1 needed for normal-size labels.

Is #10039B the same as CSS darkblue?

No — #10039B is not the CSS named color darkblue, but darkblue (#00008B) is the closest CSS named color.

#10039B Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #10039B

Not just a swatch — here's how #10039B works with other colors. Named schemes with #10039B in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #10039B Anchor #141210 Accent #DD965A Secondary #242933 Surface #F4ECE3

Zaffre 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.

Tech Product Signal · 5 colors

Signal #10039B Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #2641B9

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

Moody Editorial Color · 5 colors

Color #10039B Anchor #2A2A2E Secondary #6E6E74 Surface #EEE5DB Accent #190053

Zaffre 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 Zaffre.

Coastal Morning Lead · 5 colors

Lead #10039B Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

Zaffre opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #10039B Secondary #455681 Support #9D8F88 Ink #18140F

Zaffre 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 Zaffre carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #10039B 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 10/100

Cool

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

Softness 20/100

Low

Firm and assertive — carries weight and contrast.

Depth 74/100

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 14/100

Very low

Clean and current — no dusty, aged cast.

Luxury 64/100

High

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

Brand distinctiveness 82/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 38/100

Low

Workable accent with care around contrast.

Surface fit 19/100

Very low

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

Print safety 63/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #10039B

For UI

For branding

For interior

For fashion

People also use #10039B with

Denim Blue Grape Olive Gainsboro Prussian Blue

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 13.9:1. Use

Subtle surface Use #C8C3F4 for cards and hover fills. Tint 80

Avoid beside #42039B — 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 #10039B 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: #10039B;
  --color-base-rgb: 16 3 155;
  --color-base-oklch: oklch(31.8% 0.211 267.4);
  --color-50: #F1F0FE;
  --color-100: #DBD8FD;
  --color-200: #B7B1FC;
  --color-300: #847AF6;
  --color-400: #574AE8;
  --color-500: #3426CF;
  --color-600: #2F259D;
  --color-700: #27216E;
  --color-800: #1D1948;
  --color-900: #14122C;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  zaffre: {
    50: '#F1F0FE',
    100: '#DBD8FD',
    200: '#B7B1FC',
    300: '#847AF6',
    400: '#574AE8',
    500: '#3426CF',
    600: '#2F259D',
    700: '#27216E',
    800: '#1D1948',
    900: '#14122C',
  },
}

$base: #10039B;
$base-ink: #FFFFFF;
$base-50: #F1F0FE;
$base-100: #DBD8FD;
$base-200: #B7B1FC;
$base-300: #847AF6;
$base-400: #574AE8;
$base-500: #3426CF;
$base-600: #2F259D;
$base-700: #27216E;
$base-800: #1D1948;
$base-900: #14122C;
$base-hover: #0D037C;
$base-subtle: #AAA4F1;

{
    "color": {
        "base": {
            "value": "#10039B",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F0FE",
                "type": "color"
            },
            "100": {
                "value": "#DBD8FD",
                "type": "color"
            },
            "200": {
                "value": "#B7B1FC",
                "type": "color"
            },
            "300": {
                "value": "#847AF6",
                "type": "color"
            },
            "400": {
                "value": "#574AE8",
                "type": "color"
            },
            "500": {
                "value": "#3426CF",
                "type": "color"
            },
            "600": {
                "value": "#2F259D",
                "type": "color"
            },
            "700": {
                "value": "#27216E",
                "type": "color"
            },
            "800": {
                "value": "#1D1948",
                "type": "color"
            },
            "900": {
                "value": "#14122C",
                "type": "color"
            }
        }
    }
}

Palettes built on #10039B

Color Lab

Pairs with #10039B

UI roles & guardrails

In real applications

Scales

Every model

Export