What color is #1B2AA8?

#1B2AA8 is a dark, vivid blue. In RGB it is rgb(27, 42, 168), and in HSL hsl(234, 72%, 38%).

Is #1B2AA8 accessible as text?

On white, #1B2AA8 has a contrast ratio of 10.81:1 (passes WCAG AA for body text); on black it is 1.94:1 (fails). For text placed on #1B2AA8, use white for the best readability.

What is the closest Tailwind color to #1B2AA8?

The nearest Tailwind CSS token is indigo-800 (#372AAC).

What colors go well with #1B2AA8?

#1B2AA8 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #A7991B. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #1B2AA8 below.

Is #1B2AA8 good for buttons?

#1B2AA8 works well for buttons and highlights, but use white text on #1B2AA8 — black text only reaches 1.94:1, below the 4.5:1 needed for normal-size labels.

Is #1B2AA8 the same as CSS mediumblue?

No — #1B2AA8 is not the CSS named color mediumblue, but mediumblue (#0000CD) is the closest CSS named color.

#1B2AA8 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #1B2AA8

Not just a swatch — here's how #1B2AA8 works with other colors. Named schemes with #1B2AA8 in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #1B2AA8 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.

Tech Product Signal · 5 colors

Signal #1B2AA8 Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #3956C6

Klein 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 Klein Blue.

Moody Editorial Color · 5 colors

Color #1B2AA8 Anchor #2A2A2E Secondary #6E6E74 Surface #EEE5DB Accent #240861

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 #1B2AA8 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.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #1B2AA8 Secondary #576791 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.

Build a working theme in the generator →

Color Lab

How #1B2AA8 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 11/100

Cool

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

Softness 25/100

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 20/100

Very low

Clean and current — no dusty, aged cast.

Luxury 61/100

High

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

Brand distinctiveness 76/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 59/100

Moderate

Workable accent with care around contrast.

Surface fit 15/100

Very low

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

Print safety 65/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #1B2AA8

For UI

For branding

For interior

For fashion

People also use #1B2AA8 with

Ocean Blue Grape Citron 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 10.8:1. Use

Subtle surface Use #CFD2F0 for cards and hover fills. Tint 80

Avoid beside #3C1BA7 — 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 #1B2AA8 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: #1B2AA8;
  --color-base-rgb: 27 42 168;
  --color-base-oklch: oklch(37.9% 0.197 268.1);
  --color-50: #F1F3FD;
  --color-100: #DBDEFA;
  --color-200: #B9BFF3;
  --color-300: #8992E6;
  --color-400: #5D69D5;
  --color-500: #3B48BA;
  --color-600: #343D8E;
  --color-700: #2A3064;
  --color-800: #1F2342;
  --color-900: #151728;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  klein-blue: {
    50: '#F1F3FD',
    100: '#DBDEFA',
    200: '#B9BFF3',
    300: '#8992E6',
    400: '#5D69D5',
    500: '#3B48BA',
    600: '#343D8E',
    700: '#2A3064',
    800: '#1F2342',
    900: '#151728',
  },
}

$base: #1B2AA8;
$base-ink: #FFFFFF;
$base-50: #F1F3FD;
$base-100: #DBDEFA;
$base-200: #B9BFF3;
$base-300: #8992E6;
$base-400: #5D69D5;
$base-500: #3B48BA;
$base-600: #343D8E;
$base-700: #2A3064;
$base-800: #1F2342;
$base-900: #151728;
$base-hover: #162185;
$base-subtle: #B6BBEA;

{
    "color": {
        "base": {
            "value": "#1B2AA8",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F3FD",
                "type": "color"
            },
            "100": {
                "value": "#DBDEFA",
                "type": "color"
            },
            "200": {
                "value": "#B9BFF3",
                "type": "color"
            },
            "300": {
                "value": "#8992E6",
                "type": "color"
            },
            "400": {
                "value": "#5D69D5",
                "type": "color"
            },
            "500": {
                "value": "#3B48BA",
                "type": "color"
            },
            "600": {
                "value": "#343D8E",
                "type": "color"
            },
            "700": {
                "value": "#2A3064",
                "type": "color"
            },
            "800": {
                "value": "#1F2342",
                "type": "color"
            },
            "900": {
                "value": "#151728",
                "type": "color"
            }
        }
    }
}

Palettes built on #1B2AA8

Color Lab

Pairs with #1B2AA8

UI roles & guardrails

In real applications

Scales

Every model

Export