What color is #1B2A8E?

#1B2A8E is a dark blue. In RGB it is rgb(27, 42, 142), and in HSL hsl(232, 68%, 33%).

Is #1B2A8E accessible as text?

On white, #1B2A8E has a contrast ratio of 11.88:1 (passes WCAG AA for body text); on black it is 1.77:1 (fails). For text placed on #1B2A8E, use white for the best readability.

What is the closest Tailwind color to #1B2A8E?

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

What colors go well with #1B2A8E?

#1B2A8E pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #8D7E1B. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #1B2A8E below.

Is #1B2A8E good for buttons?

#1B2A8E works well for buttons and highlights, but use white text on #1B2A8E — black text only reaches 1.77:1, below the 4.5:1 needed for normal-size labels.

Is #1B2A8E the same as CSS midnightblue?

No — #1B2A8E is not the CSS named color midnightblue, but midnightblue (#191970) is the closest CSS named color.

#1B2A8E Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #1B2A8E

Not just a swatch — here's how #1B2A8E works with other colors. Named schemes with #1B2A8E in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #1B2A8E Anchor #141210 Accent #DC9659 Secondary #252933 Surface #F4ECE3

Klein 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 #1B2A8E Anchor #2A2A2E Secondary #6E6E74 Surface #EEE5DB Accent #1D094E

Klein 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 Klein Blue.

Coastal Morning Lead · 5 colors

Lead #1B2A8E Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

Klein 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 #1B2A8E Secondary #7F4535 Surface #EED7C2 Accent #365246 Anchor #582239

Klein 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 #F8F4EF Accent #1B2A8E Secondary #535F82 Support #9D8F88 Ink #18140F

Klein 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 Klein Blue carrying the quiet middle.

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Color Lab

How #1B2A8E 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 12/100

Cool

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

Softness 26/100

Low

Firm and assertive — carries weight and contrast.

Depth 68/100

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 27/100

Low

A faint retro warmth without tipping into sepia.

Luxury 66/100

High

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

Brand distinctiveness 63/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 56/100

Moderate

Workable accent with care around contrast.

Surface fit 17/100

Very low

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

Print safety 72/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #1B2A8E

For UI

For branding

For interior

For fashion

People also use #1B2A8E with

Steel 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 11.9:1. Use

Subtle surface Use #CCD1EE for cards and hover fills. Tint 80

Avoid beside #321B8D — 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 #1B2A8E 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: #1B2A8E;
  --color-base-rgb: 27 42 142;
  --color-base-oklch: oklch(35.0% 0.164 268.8);
  --color-50: #F2F3FD;
  --color-100: #DCE0F9;
  --color-200: #BBC2F2;
  --color-300: #8C97E3;
  --color-400: #6170D1;
  --color-500: #3F4FB6;
  --color-600: #37428B;
  --color-700: #2C3363;
  --color-800: #202441;
  --color-900: #151828;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  klein-blue: {
    50: '#F2F3FD',
    100: '#DCE0F9',
    200: '#BBC2F2',
    300: '#8C97E3',
    400: '#6170D1',
    500: '#3F4FB6',
    600: '#37428B',
    700: '#2C3363',
    800: '#202441',
    900: '#151828',
  },
}

$base: #1B2A8E;
$base-ink: #FFFFFF;
$base-50: #F2F3FD;
$base-100: #DCE0F9;
$base-200: #BBC2F2;
$base-300: #8C97E3;
$base-400: #6170D1;
$base-500: #3F4FB6;
$base-600: #37428B;
$base-700: #2C3363;
$base-800: #202441;
$base-900: #151828;
$base-hover: #162271;
$base-subtle: #B1B8E6;

{
    "color": {
        "base": {
            "value": "#1B2A8E",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F3FD",
                "type": "color"
            },
            "100": {
                "value": "#DCE0F9",
                "type": "color"
            },
            "200": {
                "value": "#BBC2F2",
                "type": "color"
            },
            "300": {
                "value": "#8C97E3",
                "type": "color"
            },
            "400": {
                "value": "#6170D1",
                "type": "color"
            },
            "500": {
                "value": "#3F4FB6",
                "type": "color"
            },
            "600": {
                "value": "#37428B",
                "type": "color"
            },
            "700": {
                "value": "#2C3363",
                "type": "color"
            },
            "800": {
                "value": "#202441",
                "type": "color"
            },
            "900": {
                "value": "#151828",
                "type": "color"
            }
        }
    }
}

Palettes built on #1B2A8E

Color Lab

Pairs with #1B2A8E

UI roles & guardrails

In real applications

Scales

Every model

Export