What color is #2B57BC?

#2B57BC is a medium blue. In RGB it is rgb(43, 87, 188), and in HSL hsl(222, 63%, 45%).

Is #2B57BC accessible as text?

On white, #2B57BC has a contrast ratio of 6.58:1 (passes WCAG AA for body text); on black it is 3.19:1 (fails). For text placed on #2B57BC, use white for the best readability.

What is the closest Tailwind color to #2B57BC?

The nearest Tailwind CSS token is sky-700 (#0069A8).

What colors go well with #2B57BC?

#2B57BC pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #BB902A. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #2B57BC below.

Is #2B57BC good for buttons?

#2B57BC works well for buttons and highlights, but use white text on #2B57BC — black text only reaches 3.19:1, below the 4.5:1 needed for normal-size labels.

Is #2B57BC the same as CSS royalblue?

No — #2B57BC is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#2B57BC Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #2B57BC

Not just a swatch — here's how #2B57BC works with other colors. Named schemes with #2B57BC in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #2B57BC Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

Cerulean 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 #2B57BC Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #527EDB

Cerulean is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Cerulean.

Vintage Leather Lead · 5 colors

Lead #2B57BC Secondary #7F4536 Surface #EED7C2 Accent #375246 Anchor #57223A

Cerulean 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 #2B57BC Surface #F6E5D8 Anchor #5B2144 Accent #E4C2CA Secondary #322B2F

Cerulean 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 #2B57BC Secondary #7688AC Support #9D8F88 Ink #18140F

Cerulean 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 Cerulean carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #2B57BC 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 35/100

Low

Middle-weight — neither delicate nor heavy.

Depth 54/100

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 33/100

Low

A faint retro warmth without tipping into sepia.

Luxury 55/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 45/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 94/100

Very high

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

Surface fit 8/100

Very low

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

Print safety 69/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #2B57BC

For UI

For branding

For interior

For fashion

People also use #2B57BC with

Lagoon Blue Grape Caramel Gainsboro Charcoal

UI roles & guardrails

Primary action Safe as a filled button with white label. AA

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 6.6:1. Use

Subtle surface Use #D6DEF0 for cards and hover fills. Tint 80

Avoid beside #2F2ABB — 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 #2B57BC 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: #2B57BC;
  --color-base-rgb: 43 87 188;
  --color-base-oklch: oklch(48.6% 0.167 263.6);
  --color-50: #F2F5FD;
  --color-100: #DDE5F8;
  --color-200: #BDCCF0;
  --color-300: #8FA7E0;
  --color-400: #6584CD;
  --color-500: #4364B2;
  --color-600: #3A5188;
  --color-700: #2E3D61;
  --color-800: #212A40;
  --color-900: #161B27;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  cerulean: {
    50: '#F2F5FD',
    100: '#DDE5F8',
    200: '#BDCCF0',
    300: '#8FA7E0',
    400: '#6584CD',
    500: '#4364B2',
    600: '#3A5188',
    700: '#2E3D61',
    800: '#212A40',
    900: '#161B27',
  },
}

$base: #2B57BC;
$base-ink: #FFFFFF;
$base-50: #F2F5FD;
$base-100: #DDE5F8;
$base-200: #BDCCF0;
$base-300: #8FA7E0;
$base-400: #6584CD;
$base-500: #4364B2;
$base-600: #3A5188;
$base-700: #2E3D61;
$base-800: #212A40;
$base-900: #161B27;
$base-hover: #224596;
$base-subtle: #C1CDE9;

{
    "color": {
        "base": {
            "value": "#2B57BC",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F5FD",
                "type": "color"
            },
            "100": {
                "value": "#DDE5F8",
                "type": "color"
            },
            "200": {
                "value": "#BDCCF0",
                "type": "color"
            },
            "300": {
                "value": "#8FA7E0",
                "type": "color"
            },
            "400": {
                "value": "#6584CD",
                "type": "color"
            },
            "500": {
                "value": "#4364B2",
                "type": "color"
            },
            "600": {
                "value": "#3A5188",
                "type": "color"
            },
            "700": {
                "value": "#2E3D61",
                "type": "color"
            },
            "800": {
                "value": "#212A40",
                "type": "color"
            },
            "900": {
                "value": "#161B27",
                "type": "color"
            }
        }
    }
}

Palettes built on #2B57BC

Color Lab

Pairs with #2B57BC

UI roles & guardrails

In real applications

Scales

Every model

Export