What color is #155D79?

#155D79 is a dark, vivid cyan-blue. In RGB it is rgb(21, 93, 121), and in HSL hsl(197, 70%, 28%).

Is #155D79 accessible as text?

On white, #155D79 has a contrast ratio of 7.31:1 (passes WCAG AA for body text); on black it is 2.87:1 (fails). For text placed on #155D79, use white for the best readability.

What is the closest Tailwind color to #155D79?

The nearest Tailwind CSS token is cyan-800 (#005F78).

What colors go well with #155D79?

#155D79 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #793215. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #155D79 below.

Is #155D79 good for buttons?

#155D79 works well for buttons and highlights, but use white text on #155D79 — black text only reaches 2.87:1, below the 4.5:1 needed for normal-size labels.

Is #155D79 the same as CSS darkslategray?

No — #155D79 is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#155D79 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #155D79

Not just a swatch — here's how #155D79 works with other colors. Named schemes with #155D79 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #155D79 Accent #A6C4BF Surface #DEDABF Secondary #9AA0A0 Anchor #1F344A

Classic Blue opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.

Nordic Calm Accent · 5 colors

Accent #155D79 Secondary #AEB4B8 Surface #F1F2F0 Support #7B93A6 Anchor #2E3236

Classic Blue keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.

Tech Product Signal · 5 colors

Signal #155D79 Surface #14161A Highlight #F4F6F8 Secondary #596672 Accent #467F9A

Classic 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 Classic Blue.

Vintage Leather Lead · 5 colors

Lead #155D79 Secondary #6F5216 Surface #E2DCC0 Accent #385244 Anchor #56233D

Classic 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.

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #155D79 Secondary #6C818B Support #969386 Ink #16140F

Classic 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 Classic Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #155D79 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 26/100

Cool

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

Softness 41/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 54/100

Moderate

Mid depth — usable as an accent or a muted ground.

Naturalness 1/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 49/100

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 22/100

Low

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

UI accent fit 77/100

High

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

Surface fit 31/100

Low

Usable as a tinted surface in measured doses.

Print safety 79/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #155D79

For UI

For branding

For interior

For fashion

People also use #155D79 with

Shamrock Green Midnight Blue Walnut Brown Platinum Charcoal

UI roles & guardrails

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

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 7.3:1. Use

Subtle surface Use #C8E2ED for cards and hover fills. Tint 80

Avoid beside #153C79 — 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 #155D79 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: #155D79;
  --color-base-rgb: 21 93 121;
  --color-base-oklch: oklch(44.9% 0.081 229.5);
  --color-50: #F1FAFD;
  --color-100: #DBF1FA;
  --color-200: #BAE3F3;
  --color-300: #8ACBE5;
  --color-400: #5FB2D3;
  --color-500: #3D95B8;
  --color-600: #35748C;
  --color-700: #2B5464;
  --color-800: #203841;
  --color-900: #152328;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  classic-blue: {
    50: '#F1FAFD',
    100: '#DBF1FA',
    200: '#BAE3F3',
    300: '#8ACBE5',
    400: '#5FB2D3',
    500: '#3D95B8',
    600: '#35748C',
    700: '#2B5464',
    800: '#203841',
    900: '#152328',
  },
}

$base: #155D79;
$base-ink: #FFFFFF;
$base-50: #F1FAFD;
$base-100: #DBF1FA;
$base-200: #BAE3F3;
$base-300: #8ACBE5;
$base-400: #5FB2D3;
$base-500: #3D95B8;
$base-600: #35748C;
$base-700: #2B5464;
$base-800: #203841;
$base-900: #152328;
$base-hover: #114A61;
$base-subtle: #ABD5E5;

{
    "color": {
        "base": {
            "value": "#155D79",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1FAFD",
                "type": "color"
            },
            "100": {
                "value": "#DBF1FA",
                "type": "color"
            },
            "200": {
                "value": "#BAE3F3",
                "type": "color"
            },
            "300": {
                "value": "#8ACBE5",
                "type": "color"
            },
            "400": {
                "value": "#5FB2D3",
                "type": "color"
            },
            "500": {
                "value": "#3D95B8",
                "type": "color"
            },
            "600": {
                "value": "#35748C",
                "type": "color"
            },
            "700": {
                "value": "#2B5464",
                "type": "color"
            },
            "800": {
                "value": "#203841",
                "type": "color"
            },
            "900": {
                "value": "#152328",
                "type": "color"
            }
        }
    }
}

Palettes built on #155D79

Color Lab

Pairs with #155D79

UI roles & guardrails

In real applications

Scales

Every model

Export