What color is #155DC8?

#155DC8 is a medium, vivid blue. In RGB it is rgb(21, 93, 200), and in HSL hsl(216, 81%, 43%).

Is #155DC8 accessible as text?

On white, #155DC8 has a contrast ratio of 6.12:1 (passes WCAG AA for body text); on black it is 3.43:1 (fails). For text placed on #155DC8, use white for the best readability.

What is the closest Tailwind color to #155DC8?

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

What colors go well with #155DC8?

#155DC8 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #C67F15. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #155DC8 below.

Is #155DC8 good for buttons?

#155DC8 works well for buttons and highlights, but use white text on #155DC8 — black text only reaches 3.43:1, below the 4.5:1 needed for normal-size labels.

Is #155DC8 the same as CSS royalblue?

No — #155DC8 is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#155DC8 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #155DC8

Not just a swatch — here's how #155DC8 works with other colors. Named schemes with #155DC8 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #155DC8 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 #155DC8 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #4684E7

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 #155DC8 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 #155DC8 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 #155DC8 Secondary #768EB4 Support #9D8F89 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 #155DC8 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 6/100

Cool

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

Softness 34/100

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 29/100

Low

A faint retro warmth without tipping into sepia.

Luxury 52/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 49/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 93/100

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 65/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #155DC8

For UI

For branding

For interior

For fashion

People also use #155DC8 with

Turquoise Medium 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 6.1:1. Use

Subtle surface Use #D1DFF3 for cards and hover fills. Tint 80

Avoid beside #1521C6 — 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 #155DC8 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: #155DC8;
  --color-base-rgb: 21 93 200;
  --color-base-oklch: oklch(50.2% 0.180 259.3);
  --color-50: #F1F6FE;
  --color-100: #D9E7FC;
  --color-200: #B5D0F7;
  --color-300: #83ADEC;
  --color-400: #568CDC;
  --color-500: #336CC2;
  --color-600: #2E5793;
  --color-700: #274168;
  --color-800: #1D2D44;
  --color-900: #141C2A;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  denim-blue: {
    50: '#F1F6FE',
    100: '#D9E7FC',
    200: '#B5D0F7',
    300: '#83ADEC',
    400: '#568CDC',
    500: '#336CC2',
    600: '#2E5793',
    700: '#274168',
    800: '#1D2D44',
    900: '#141C2A',
  },
}

$base: #155DC8;
$base-ink: #FFFFFF;
$base-50: #F1F6FE;
$base-100: #D9E7FC;
$base-200: #B5D0F7;
$base-300: #83ADEC;
$base-400: #568CDC;
$base-500: #336CC2;
$base-600: #2E5793;
$base-700: #274168;
$base-800: #1D2D44;
$base-900: #141C2A;
$base-hover: #114A9F;
$base-subtle: #B9CEEE;

{
    "color": {
        "base": {
            "value": "#155DC8",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F6FE",
                "type": "color"
            },
            "100": {
                "value": "#D9E7FC",
                "type": "color"
            },
            "200": {
                "value": "#B5D0F7",
                "type": "color"
            },
            "300": {
                "value": "#83ADEC",
                "type": "color"
            },
            "400": {
                "value": "#568CDC",
                "type": "color"
            },
            "500": {
                "value": "#336CC2",
                "type": "color"
            },
            "600": {
                "value": "#2E5793",
                "type": "color"
            },
            "700": {
                "value": "#274168",
                "type": "color"
            },
            "800": {
                "value": "#1D2D44",
                "type": "color"
            },
            "900": {
                "value": "#141C2A",
                "type": "color"
            }
        }
    }
}

Palettes built on #155DC8

Color Lab

Pairs with #155DC8

UI roles & guardrails

In real applications

Scales

Every model

Export