What color is #155F63?

#155F63 is a dark cyan. In RGB it is rgb(21, 95, 99), and in HSL hsl(183, 65%, 24%).

Is #155F63 accessible as text?

On white, #155F63 has a contrast ratio of 7.37:1 (passes WCAG AA for body text); on black it is 2.85:1 (fails). For text placed on #155F63, use white for the best readability.

What is the closest Tailwind color to #155F63?

The nearest Tailwind CSS token is teal-800 (#005F5A).

What colors go well with #155F63?

#155F63 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #651915. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #155F63 below.

Is #155F63 good for buttons?

#155F63 works well for buttons and highlights, but use white text on #155F63 — black text only reaches 2.85:1, below the 4.5:1 needed for normal-size labels.

Is #155F63 the same as CSS darkslategray?

No — #155F63 is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#155F63 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #155F63

Not just a swatch — here's how #155F63 works with other colors. Named schemes with #155F63 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #155F63 Accent #A6C4BE Surface #DFDABE Secondary #9AA0A0 Anchor #1D3549

Dark Slate Gray 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 #155F63 Secondary #AEB4B8 Surface #F1F2F0 Support #7A94A5 Anchor #2E3236

Dark Slate Gray 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 #155F63 Surface #14161A Highlight #F4F6F8 Secondary #596771 Accent #468184

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

Vintage Leather Lead · 5 colors

Lead #155F63 Secondary #715017 Surface #E3DCC0 Accent #395143 Anchor #552340

Dark Slate Gray 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 #155F63 Secondary #6C8081 Support #979286 Ink #16140F

Dark Slate Gray 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 Dark Slate Gray carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #155F63 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 32/100

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 8/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 47/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 59/100

Moderate

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

Brand distinctiveness 19/100

Very low

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

UI accent fit 71/100

High

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

Surface fit 35/100

Low

Usable as a tinted surface in measured doses.

Print safety 82/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #155F63

For UI

For branding

For interior

For fashion

People also use #155F63 with

Sea Green Yale Blue Rosewood Platinum Dark Slate Gray

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 7.4:1. Use

Subtle surface Use #C6E9EA for cards and hover fills. Tint 80

Avoid beside #154665 — 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 #155F63 at work across the surfaces designers actually ship.

Website / UI

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Build faster.

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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: #155F63;
  --color-base-rgb: 21 95 99;
  --color-base-oklch: oklch(44.5% 0.069 200.5);
  --color-50: #F2FCFD;
  --color-100: #DDF7F9;
  --color-200: #BCEEF1;
  --color-300: #8EDDE2;
  --color-400: #63C9CF;
  --color-500: #41AEB4;
  --color-600: #388589;
  --color-700: #2D5F62;
  --color-800: #213F40;
  --color-900: #162727;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  dark-slate-gray: {
    50: '#F2FCFD',
    100: '#DDF7F9',
    200: '#BCEEF1',
    300: '#8EDDE2',
    400: '#63C9CF',
    500: '#41AEB4',
    600: '#388589',
    700: '#2D5F62',
    800: '#213F40',
    900: '#162727',
  },
}

$base: #155F63;
$base-ink: #FFFFFF;
$base-50: #F2FCFD;
$base-100: #DDF7F9;
$base-200: #BCEEF1;
$base-300: #8EDDE2;
$base-400: #63C9CF;
$base-500: #41AEB4;
$base-600: #388589;
$base-700: #2D5F62;
$base-800: #213F40;
$base-900: #162727;
$base-hover: #114E51;
$base-subtle: #A8DFE2;

{
    "color": {
        "base": {
            "value": "#155F63",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2FCFD",
                "type": "color"
            },
            "100": {
                "value": "#DDF7F9",
                "type": "color"
            },
            "200": {
                "value": "#BCEEF1",
                "type": "color"
            },
            "300": {
                "value": "#8EDDE2",
                "type": "color"
            },
            "400": {
                "value": "#63C9CF",
                "type": "color"
            },
            "500": {
                "value": "#41AEB4",
                "type": "color"
            },
            "600": {
                "value": "#388589",
                "type": "color"
            },
            "700": {
                "value": "#2D5F62",
                "type": "color"
            },
            "800": {
                "value": "#213F40",
                "type": "color"
            },
            "900": {
                "value": "#162727",
                "type": "color"
            }
        }
    }
}

Palettes built on #155F63

Color Lab

Pairs with #155F63

UI roles & guardrails

In real applications

Scales

Every model

Export