What color is #0A2CB2?

#0A2CB2 is a dark, vivid blue. In RGB it is rgb(10, 44, 178), and in HSL hsl(228, 89%, 37%).

Is #0A2CB2 accessible as text?

On white, #0A2CB2 has a contrast ratio of 10.42:1 (passes WCAG AA for body text); on black it is 2.02:1 (fails). For text placed on #0A2CB2, use white for the best readability.

What is the closest Tailwind color to #0A2CB2?

The nearest Tailwind CSS token is blue-800 (#193CB8).

What colors go well with #0A2CB2?

#0A2CB2 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #B2910A. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #0A2CB2 below.

Is #0A2CB2 good for buttons?

#0A2CB2 works well for buttons and highlights, but use white text on #0A2CB2 — black text only reaches 2.02:1, below the 4.5:1 needed for normal-size labels.

Is #0A2CB2 the same as CSS mediumblue?

No — #0A2CB2 is not the CSS named color mediumblue, but mediumblue (#0000CD) is the closest CSS named color.

#0A2CB2 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #0A2CB2

Not just a swatch — here's how #0A2CB2 works with other colors. Named schemes with #0A2CB2 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #0A2CB2 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #2E5AD0

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.

Coastal Morning Lead · 5 colors

Lead #0A2CB2 Accent #A5C4C2 Surface #DDDBBF 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.

Berry & Cream Lead · 5 colors

Lead #0A2CB2 Surface #F6E5D8 Anchor #5B2144 Accent #E5C2CA Secondary #322B2F

Klein Blue sits between cream and a deep berry here, softened by a blush accent and grounded by charcoal.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #0A2CB2 Secondary #566A96 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.

Sunset Warmth Glow · 5 colors

Glow #0A2CB2 Secondary #E76A75 Accent #F79251 Anchor #573B58 Surface #F7E7D7

Klein Blue glows at the center of this sunset palette, joined by coral and gold, deepened by a plum anchor and cooled with cream.

Build a working theme in the generator →

Color Lab

How #0A2CB2 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 24/100

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 16/100

Very low

Clean and current — no dusty, aged cast.

Luxury 59/100

Moderate

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

Brand distinctiveness 81/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 58/100

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 62/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #0A2CB2

For UI

For branding

For interior

For fashion

People also use #0A2CB2 with

Carolina Blue Egyptian Blue Dark Goldenrod Gainsboro Gunmetal Gray

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 10.4:1. Use

Subtle surface Use #CAD3F3 for cards and hover fills. Tint 80

Avoid beside #210AB2 — 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 #0A2CB2 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: #0A2CB2;
  --color-base-rgb: 10 44 178;
  --color-base-oklch: oklch(38.8% 0.210 264.8);
  --color-50: #F0F3FE;
  --color-100: #D8DFFD;
  --color-200: #B2C0FA;
  --color-300: #7E95F1;
  --color-400: #4F6DE3;
  --color-500: #2C4BC9;
  --color-600: #2A4098;
  --color-700: #23326B;
  --color-800: #1B2446;
  --color-900: #13172B;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  klein-blue: {
    50: '#F0F3FE',
    100: '#D8DFFD',
    200: '#B2C0FA',
    300: '#7E95F1',
    400: '#4F6DE3',
    500: '#2C4BC9',
    600: '#2A4098',
    700: '#23326B',
    800: '#1B2446',
    900: '#13172B',
  },
}

$base: #0A2CB2;
$base-ink: #FFFFFF;
$base-50: #F0F3FE;
$base-100: #D8DFFD;
$base-200: #B2C0FA;
$base-300: #7E95F1;
$base-400: #4F6DE3;
$base-500: #2C4BC9;
$base-600: #2A4098;
$base-700: #23326B;
$base-800: #1B2446;
$base-900: #13172B;
$base-hover: #08238F;
$base-subtle: #AEBBEF;

{
    "color": {
        "base": {
            "value": "#0A2CB2",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F3FE",
                "type": "color"
            },
            "100": {
                "value": "#D8DFFD",
                "type": "color"
            },
            "200": {
                "value": "#B2C0FA",
                "type": "color"
            },
            "300": {
                "value": "#7E95F1",
                "type": "color"
            },
            "400": {
                "value": "#4F6DE3",
                "type": "color"
            },
            "500": {
                "value": "#2C4BC9",
                "type": "color"
            },
            "600": {
                "value": "#2A4098",
                "type": "color"
            },
            "700": {
                "value": "#23326B",
                "type": "color"
            },
            "800": {
                "value": "#1B2446",
                "type": "color"
            },
            "900": {
                "value": "#13172B",
                "type": "color"
            }
        }
    }
}

Palettes built on #0A2CB2

Color Lab

Pairs with #0A2CB2

UI roles & guardrails

In real applications

Scales

Every model

Export