What color is #255BB1?

#255BB1 is a medium blue. In RGB it is rgb(37, 91, 177), and in HSL hsl(217, 65%, 42%).

Is #255BB1 accessible as text?

On white, #255BB1 has a contrast ratio of 6.54:1 (passes WCAG AA for body text); on black it is 3.21:1 (fails). For text placed on #255BB1, use white for the best readability.

What is the closest Tailwind color to #255BB1?

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

What colors go well with #255BB1?

#255BB1 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #B17B25. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #255BB1 below.

Is #255BB1 good for buttons?

#255BB1 works well for buttons and highlights, but use white text on #255BB1 — black text only reaches 3.21:1, below the 4.5:1 needed for normal-size labels.

Is #255BB1 the same as CSS royalblue?

No — #255BB1 is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#255BB1 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #255BB1

Not just a swatch — here's how #255BB1 works with other colors. Named schemes with #255BB1 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #255BB1 Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

Denim 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 #255BB1 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #4F81D1

Denim 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 Denim Blue.

Vintage Leather Lead · 5 colors

Lead #255BB1 Secondary #7F4536 Surface #E1DDC1 Accent #375246 Anchor #57223A

Denim 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 #255BB1 Surface #F6E5D8 Anchor #5A2144 Accent #E4C2CA Secondary #322B2F

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

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #255BB1 Secondary #7588A7 Support #9D8F88 Ink #16140F

Denim 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 Denim Blue carrying the quiet middle.

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Color Lab

How #255BB1 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 12/100

Cool

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

Softness 36/100

Low

Middle-weight — neither delicate nor heavy.

Depth 53/100

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 38/100

Low

A faint retro warmth without tipping into sepia.

Luxury 56/100

Moderate

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

Brand distinctiveness 40/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 96/100

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 71/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #255BB1

For UI

For branding

For interior

For fashion

People also use #255BB1 with

Dark Turquoise Egyptian Blue Copper 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 6.5:1. Use

Subtle surface Use #D4DEEF for cards and hover fills. Tint 80

Avoid beside #252CB1 — 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 #255BB1 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: #255BB1;
  --color-base-rgb: 37 91 177;
  --color-base-oklch: oklch(48.4% 0.149 259.5);
  --color-50: #F2F6FD;
  --color-100: #DDE7F9;
  --color-200: #BCD0F1;
  --color-300: #8EAEE2;
  --color-400: #638CCF;
  --color-500: #416DB4;
  --color-600: #385789;
  --color-700: #2D4162;
  --color-800: #212D40;
  --color-900: #161D27;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  denim-blue: {
    50: '#F2F6FD',
    100: '#DDE7F9',
    200: '#BCD0F1',
    300: '#8EAEE2',
    400: '#638CCF',
    500: '#416DB4',
    600: '#385789',
    700: '#2D4162',
    800: '#212D40',
    900: '#161D27',
  },
}

$base: #255BB1;
$base-ink: #FFFFFF;
$base-50: #F2F6FD;
$base-100: #DDE7F9;
$base-200: #BCD0F1;
$base-300: #8EAEE2;
$base-400: #638CCF;
$base-500: #416DB4;
$base-600: #385789;
$base-700: #2D4162;
$base-800: #212D40;
$base-900: #161D27;
$base-hover: #1E498D;
$base-subtle: #BDCEE9;

{
    "color": {
        "base": {
            "value": "#255BB1",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F6FD",
                "type": "color"
            },
            "100": {
                "value": "#DDE7F9",
                "type": "color"
            },
            "200": {
                "value": "#BCD0F1",
                "type": "color"
            },
            "300": {
                "value": "#8EAEE2",
                "type": "color"
            },
            "400": {
                "value": "#638CCF",
                "type": "color"
            },
            "500": {
                "value": "#416DB4",
                "type": "color"
            },
            "600": {
                "value": "#385789",
                "type": "color"
            },
            "700": {
                "value": "#2D4162",
                "type": "color"
            },
            "800": {
                "value": "#212D40",
                "type": "color"
            },
            "900": {
                "value": "#161D27",
                "type": "color"
            }
        }
    }
}

Palettes built on #255BB1

Color Lab

Pairs with #255BB1

UI roles & guardrails

In real applications

Scales

Every model

Export