What color is #155F8A?

#155F8A is a dark, vivid cyan-blue. In RGB it is rgb(21, 95, 138), and in HSL hsl(202, 74%, 31%).

Is #155F8A accessible as text?

On white, #155F8A has a contrast ratio of 6.92:1 (passes WCAG AA for body text); on black it is 3.04:1 (fails). For text placed on #155F8A, use white for the best readability.

What is the closest Tailwind color to #155F8A?

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

What colors go well with #155F8A?

#155F8A pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #8A3F15. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #155F8A below.

Is #155F8A good for buttons?

#155F8A works well for buttons and highlights, but use white text on #155F8A — black text only reaches 3.04:1, below the 4.5:1 needed for normal-size labels.

Is #155F8A the same as CSS darkslategray?

No — #155F8A is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#155F8A Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #155F8A

Not just a swatch — here's how #155F8A works with other colors. Named schemes with #155F8A in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #155F8A Accent #A5C4C0 Surface #DEDABF Secondary #9AA0A0 Anchor #1F344A

Lapis Lazuli 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 #155F8A Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #4782AB

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

Vintage Leather Lead · 5 colors

Lead #155F8A Secondary #7F4439 Surface #E2DDC0 Accent #385245 Anchor #57233C

Lapis Lazuli 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 #155F8A Surface #EEE9D6 Anchor #592246 Accent #E4C2CC Secondary #322B30

Lapis Lazuli 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 #155F8A Secondary #6F8594 Support #969386 Ink #16140F

Lapis Lazuli 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 Lapis Lazuli carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #155F8A 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 21/100

Cool

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

Softness 40/100

Moderate

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 50/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 60/100

Moderate

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

Brand distinctiveness 26/100

Low

Quiet and neutral — a supporting tone, not a signature.

UI accent fit 86/100

Very high

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

Surface fit 25/100

Low

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

Print safety 76/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #155F8A

For UI

For branding

For interior

For fashion

People also use #155F8A with

Jungle Green Phthalo Blue Russet Platinum 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 6.9:1. Use

Subtle surface Use #C9E1EF for cards and hover fills. Tint 80

Avoid beside #15388A — 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 #155F8A 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: #155F8A;
  --color-base-rgb: 21 95 138;
  --color-base-oklch: oklch(46.4% 0.098 240.4);
  --color-50: #F1F9FE;
  --color-100: #DBEFFB;
  --color-200: #B8DEF4;
  --color-300: #88C4E7;
  --color-400: #5CA9D6;
  --color-500: #398CBC;
  --color-600: #336D8F;
  --color-700: #2A4F65;
  --color-800: #1F3542;
  --color-900: #152129;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  lapis-lazuli: {
    50: '#F1F9FE',
    100: '#DBEFFB',
    200: '#B8DEF4',
    300: '#88C4E7',
    400: '#5CA9D6',
    500: '#398CBC',
    600: '#336D8F',
    700: '#2A4F65',
    800: '#1F3542',
    900: '#152129',
  },
}

$base: #155F8A;
$base-ink: #FFFFFF;
$base-50: #F1F9FE;
$base-100: #DBEFFB;
$base-200: #B8DEF4;
$base-300: #88C4E7;
$base-400: #5CA9D6;
$base-500: #398CBC;
$base-600: #336D8F;
$base-700: #2A4F65;
$base-800: #1F3542;
$base-900: #152129;
$base-hover: #104C6E;
$base-subtle: #ADD2E8;

{
    "color": {
        "base": {
            "value": "#155F8A",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F9FE",
                "type": "color"
            },
            "100": {
                "value": "#DBEFFB",
                "type": "color"
            },
            "200": {
                "value": "#B8DEF4",
                "type": "color"
            },
            "300": {
                "value": "#88C4E7",
                "type": "color"
            },
            "400": {
                "value": "#5CA9D6",
                "type": "color"
            },
            "500": {
                "value": "#398CBC",
                "type": "color"
            },
            "600": {
                "value": "#336D8F",
                "type": "color"
            },
            "700": {
                "value": "#2A4F65",
                "type": "color"
            },
            "800": {
                "value": "#1F3542",
                "type": "color"
            },
            "900": {
                "value": "#152129",
                "type": "color"
            }
        }
    }
}

Palettes built on #155F8A

Color Lab

Pairs with #155F8A

UI roles & guardrails

In real applications

Scales

Every model

Export