What color is #01099D?

#01099D is a dark, vivid blue. In RGB it is rgb(1, 9, 157), and in HSL hsl(237, 99%, 31%).

Is #01099D accessible as text?

On white, #01099D has a contrast ratio of 13.75:1 (passes WCAG AA for body text); on black it is 1.53:1 (fails). For text placed on #01099D, use white for the best readability.

What is the closest Tailwind color to #01099D?

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

What colors go well with #01099D?

#01099D pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #9D9501. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #01099D below.

Is #01099D good for buttons?

#01099D works well for buttons and highlights, but use white text on #01099D — black text only reaches 1.53:1, below the 4.5:1 needed for normal-size labels.

Is #01099D the same as CSS darkblue?

No — #01099D is not the CSS named color darkblue, but darkblue (#00008B) is the closest CSS named color.

#01099D Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #01099D

Not just a swatch — here's how #01099D works with other colors. Named schemes with #01099D in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #01099D Anchor #141210 Accent #ACAE53 Secondary #242933 Surface #F0EEE3

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 #01099D Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #1944BA

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 #01099D Anchor #2A2A2E Secondary #6E6E74 Surface #E9E7DA Accent #170056

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 #01099D Accent #A5C4C2 Surface #DDDBBF 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 #01099D Secondary #435782 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 #01099D 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 9/100

Cool

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

Softness 20/100

Low

Firm and assertive — carries weight and contrast.

Depth 73/100

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 83/100

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 61/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #01099D

For UI

For branding

For interior

For fashion

People also use #01099D with

True Blue Indigo 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 13.8:1. Use

Subtle surface Use #C3C5F5 for cards and hover fills. Tint 80

Avoid beside #2D019D — 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 #01099D 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: #01099D;
  --color-base-rgb: 1 9 157;
  --color-base-oklch: oklch(32.1% 0.214 264.3);
  --color-50: #F0F1FE;
  --color-100: #D8DAFD;
  --color-200: #B1B4FC;
  --color-300: #787EF7;
  --color-400: #474FEB;
  --color-500: #232CD2;
  --color-600: #23299F;
  --color-700: #1F236F;
  --color-800: #191B48;
  --color-900: #11132C;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  zaffre: {
    50: '#F0F1FE',
    100: '#D8DAFD',
    200: '#B1B4FC',
    300: '#787EF7',
    400: '#474FEB',
    500: '#232CD2',
    600: '#23299F',
    700: '#1F236F',
    800: '#191B48',
    900: '#11132C',
  },
}

$base: #01099D;
$base-ink: #FFFFFF;
$base-50: #F0F1FE;
$base-100: #D8DAFD;
$base-200: #B1B4FC;
$base-300: #787EF7;
$base-400: #474FEB;
$base-500: #232CD2;
$base-600: #23299F;
$base-700: #1F236F;
$base-800: #191B48;
$base-900: #11132C;
$base-hover: #01077E;
$base-subtle: #A2A6F2;

{
    "color": {
        "base": {
            "value": "#01099D",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F1FE",
                "type": "color"
            },
            "100": {
                "value": "#D8DAFD",
                "type": "color"
            },
            "200": {
                "value": "#B1B4FC",
                "type": "color"
            },
            "300": {
                "value": "#787EF7",
                "type": "color"
            },
            "400": {
                "value": "#474FEB",
                "type": "color"
            },
            "500": {
                "value": "#232CD2",
                "type": "color"
            },
            "600": {
                "value": "#23299F",
                "type": "color"
            },
            "700": {
                "value": "#1F236F",
                "type": "color"
            },
            "800": {
                "value": "#191B48",
                "type": "color"
            },
            "900": {
                "value": "#11132C",
                "type": "color"
            }
        }
    }
}

Palettes built on #01099D

Color Lab

Pairs with #01099D

UI roles & guardrails

In real applications

Scales

Every model

Export