What color is #274EA3?

#274EA3 is a medium blue. In RGB it is rgb(39, 78, 163), and in HSL hsl(221, 61%, 40%).

Is #274EA3 accessible as text?

On white, #274EA3 has a contrast ratio of 7.76:1 (passes WCAG AA for body text); on black it is 2.70:1 (fails). For text placed on #274EA3, use white for the best readability.

What is the closest Tailwind color to #274EA3?

The nearest Tailwind CSS token is sky-800 (#00598A).

What colors go well with #274EA3?

#274EA3 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #A47D28. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #274EA3 below.

Is #274EA3 good for buttons?

#274EA3 works well for buttons and highlights, but use white text on #274EA3 — black text only reaches 2.70:1, below the 4.5:1 needed for normal-size labels.

Is #274EA3 the same as CSS darkslateblue?

No — #274EA3 is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#274EA3 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #274EA3

Not just a swatch — here's how #274EA3 works with other colors. Named schemes with #274EA3 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #274EA3 Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

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

Tech Product Signal · 5 colors

Signal #274EA3 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #4D73C2

Cobalt 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 Cobalt Blue.

Vintage Leather Lead · 5 colors

Lead #274EA3 Secondary #7F4536 Surface #EED7C2 Accent #375246 Anchor #57223A

Cobalt 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.

Berry & Cream Lead · 5 colors

Lead #274EA3 Surface #F6E5D8 Anchor #5B2144 Accent #E4C2CA Secondary #322B2F

Cobalt 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 #274EA3 Secondary #6C7C9B Support #9D8F88 Ink #18140F

Cobalt 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 Cobalt Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #274EA3 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 14/100

Cool

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

Softness 34/100

Low

Middle-weight — neither delicate nor heavy.

Depth 57/100

Moderate

Mid depth — usable as an accent or a muted ground.

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 37/100

Low

A faint retro warmth without tipping into sepia.

Luxury 60/100

Moderate

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

Brand distinctiveness 39/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 88/100

Very high

Strong interactive accent — visible and can carry a legible label.

Surface fit 12/100

Very low

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

Print safety 73/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #274EA3

For UI

For branding

For interior

For fashion

People also use #274EA3 with

Verdigris Dark Slate Blue Copper Gainsboro Charcoal

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 7.8:1. Use

Subtle surface Use #D3DBEE for cards and hover fills. Tint 80

Avoid beside #2A28A4 — 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 #274EA3 at work across the surfaces designers actually ship.

Website / UI

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Build faster.

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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: #274EA3;
  --color-base-rgb: 39 78 163;
  --color-base-oklch: oklch(44.6% 0.145 263.2);
  --color-50: #F2F5FC;
  --color-100: #DDE6F8;
  --color-200: #BDCDEF;
  --color-300: #90A9DF;
  --color-400: #6786CB;
  --color-500: #4567B0;
  --color-600: #3B5387;
  --color-700: #2F3E60;
  --color-800: #222B3F;
  --color-900: #161C27;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  cobalt-blue: {
    50: '#F2F5FC',
    100: '#DDE6F8',
    200: '#BDCDEF',
    300: '#90A9DF',
    400: '#6786CB',
    500: '#4567B0',
    600: '#3B5387',
    700: '#2F3E60',
    800: '#222B3F',
    900: '#161C27',
  },
}

$base: #274EA3;
$base-ink: #FFFFFF;
$base-50: #F2F5FC;
$base-100: #DDE6F8;
$base-200: #BDCDEF;
$base-300: #90A9DF;
$base-400: #6786CB;
$base-500: #4567B0;
$base-600: #3B5387;
$base-700: #2F3E60;
$base-800: #222B3F;
$base-900: #161C27;
$base-hover: #203F83;
$base-subtle: #BCC9E6;

{
    "color": {
        "base": {
            "value": "#274EA3",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F5FC",
                "type": "color"
            },
            "100": {
                "value": "#DDE6F8",
                "type": "color"
            },
            "200": {
                "value": "#BDCDEF",
                "type": "color"
            },
            "300": {
                "value": "#90A9DF",
                "type": "color"
            },
            "400": {
                "value": "#6786CB",
                "type": "color"
            },
            "500": {
                "value": "#4567B0",
                "type": "color"
            },
            "600": {
                "value": "#3B5387",
                "type": "color"
            },
            "700": {
                "value": "#2F3E60",
                "type": "color"
            },
            "800": {
                "value": "#222B3F",
                "type": "color"
            },
            "900": {
                "value": "#161C27",
                "type": "color"
            }
        }
    }
}