What color is #2155BC?

#2155BC is a medium, vivid blue. In RGB it is rgb(33, 85, 188), and in HSL hsl(220, 70%, 43%).

Is #2155BC accessible as text?

On white, #2155BC has a contrast ratio of 6.80:1 (passes WCAG AA for body text); on black it is 3.09:1 (fails). For text placed on #2155BC, use white for the best readability.

What is the closest Tailwind color to #2155BC?

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

What colors go well with #2155BC?

#2155BC pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #BA8721. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #2155BC below.

Is #2155BC good for buttons?

#2155BC works well for buttons and highlights, but use white text on #2155BC — black text only reaches 3.09:1, below the 4.5:1 needed for normal-size labels.

Is #2155BC the same as CSS royalblue?

No — #2155BC is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#2155BC Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #2155BC

Not just a swatch — here's how #2155BC works with other colors. Named schemes with #2155BC in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #2155BC 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 #2155BC Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #4A7CDB

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 #2155BC Secondary #7F4536 Surface #E1DDC1 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 #2155BC Surface #F6E5D8 Anchor #5A2144 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 #2155BC Secondary #7286AB 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.

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Color Lab

How #2155BC 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 8/100

Cool

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

Softness 34/100

Low

Middle-weight — neither delicate nor heavy.

Depth 55/100

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 31/100

Low

A faint retro warmth without tipping into sepia.

Luxury 55/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 46/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 92/100

Very high

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

Surface fit 9/100

Very low

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

Print safety 67/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #2155BC

For UI

For branding

For interior

For fashion

People also use #2155BC with

Lagoon Blue Egyptian Blue Dark Goldenrod 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 6.8:1. Use

Subtle surface Use #D3DDF1 for cards and hover fills. Tint 80

Avoid beside #2121BA — 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 #2155BC 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: #2155BC;
  --color-base-rgb: 33 85 188;
  --color-base-oklch: oklch(47.9% 0.172 262.0);
  --color-50: #F1F5FD;
  --color-100: #DBE6FA;
  --color-200: #BACDF3;
  --color-300: #8AA9E5;
  --color-400: #5F86D3;
  --color-500: #3D66B8;
  --color-600: #35528C;
  --color-700: #2B3E64;
  --color-800: #202B41;
  --color-900: #151B28;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  cerulean: {
    50: '#F1F5FD',
    100: '#DBE6FA',
    200: '#BACDF3',
    300: '#8AA9E5',
    400: '#5F86D3',
    500: '#3D66B8',
    600: '#35528C',
    700: '#2B3E64',
    800: '#202B41',
    900: '#151B28',
  },
}

$base: #2155BC;
$base-ink: #FFFFFF;
$base-50: #F1F5FD;
$base-100: #DBE6FA;
$base-200: #BACDF3;
$base-300: #8AA9E5;
$base-400: #5F86D3;
$base-500: #3D66B8;
$base-600: #35528C;
$base-700: #2B3E64;
$base-800: #202B41;
$base-900: #151B28;
$base-hover: #1A4395;
$base-subtle: #BCCCEB;

{
    "color": {
        "base": {
            "value": "#2155BC",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F5FD",
                "type": "color"
            },
            "100": {
                "value": "#DBE6FA",
                "type": "color"
            },
            "200": {
                "value": "#BACDF3",
                "type": "color"
            },
            "300": {
                "value": "#8AA9E5",
                "type": "color"
            },
            "400": {
                "value": "#5F86D3",
                "type": "color"
            },
            "500": {
                "value": "#3D66B8",
                "type": "color"
            },
            "600": {
                "value": "#35528C",
                "type": "color"
            },
            "700": {
                "value": "#2B3E64",
                "type": "color"
            },
            "800": {
                "value": "#202B41",
                "type": "color"
            },
            "900": {
                "value": "#151B28",
                "type": "color"
            }
        }
    }
}

Palettes built on #2155BC

Color Lab

Pairs with #2155BC

UI roles & guardrails

In real applications

Scales

Every model

Export