What color is #175E66?

#175E66 is a dark cyan. In RGB it is rgb(23, 94, 102), and in HSL hsl(186, 63%, 25%).

Is #175E66 accessible as text?

On white, #175E66 has a contrast ratio of 7.42:1 (passes WCAG AA for body text); on black it is 2.83:1 (fails). For text placed on #175E66, use white for the best readability.

What is the closest Tailwind color to #175E66?

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

What colors go well with #175E66?

#175E66 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #682018. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #175E66 below.

Is #175E66 good for buttons?

#175E66 works well for buttons and highlights, but use white text on #175E66 — black text only reaches 2.83:1, below the 4.5:1 needed for normal-size labels.

Is #175E66 the same as CSS darkslategray?

No — #175E66 is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#175E66 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #175E66

Not just a swatch — here's how #175E66 works with other colors. Named schemes with #175E66 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #175E66 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 #175E66 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 #175E66 Surface #14161A Highlight #F4F6F8 Secondary #596671 Accent #478087

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 #175E66 Secondary #715117 Surface #E3DCC0 Accent #395143 Anchor #56233F

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 #175E66 Secondary #6C8082 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 #175E66 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 5/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 46/100

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 18/100

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 36/100

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 #175E66

For UI

For branding

For interior

For fashion

People also use #175E66 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 #C7E7EA for cards and hover fills. Tint 80

Avoid beside #184568 — 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 #175E66 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: #175E66;
  --color-base-rgb: 23 94 102;
  --color-base-oklch: oklch(44.4% 0.068 206.2);
  --color-50: #F2FCFD;
  --color-100: #DDF5F8;
  --color-200: #BDEBF0;
  --color-300: #8FD8E0;
  --color-400: #65C3CD;
  --color-500: #43A7B2;
  --color-600: #3A8088;
  --color-700: #2E5C61;
  --color-800: #213D40;
  --color-900: #162527;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  dark-slate-gray: {
    50: '#F2FCFD',
    100: '#DDF5F8',
    200: '#BDEBF0',
    300: '#8FD8E0',
    400: '#65C3CD',
    500: '#43A7B2',
    600: '#3A8088',
    700: '#2E5C61',
    800: '#213D40',
    900: '#162527',
  },
}

$base: #175E66;
$base-ink: #FFFFFF;
$base-50: #F2FCFD;
$base-100: #DDF5F8;
$base-200: #BDEBF0;
$base-300: #8FD8E0;
$base-400: #65C3CD;
$base-500: #43A7B2;
$base-600: #3A8088;
$base-700: #2E5C61;
$base-800: #213D40;
$base-900: #162527;
$base-hover: #134D53;
$base-subtle: #AADCE1;

{
    "color": {
        "base": {
            "value": "#175E66",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2FCFD",
                "type": "color"
            },
            "100": {
                "value": "#DDF5F8",
                "type": "color"
            },
            "200": {
                "value": "#BDEBF0",
                "type": "color"
            },
            "300": {
                "value": "#8FD8E0",
                "type": "color"
            },
            "400": {
                "value": "#65C3CD",
                "type": "color"
            },
            "500": {
                "value": "#43A7B2",
                "type": "color"
            },
            "600": {
                "value": "#3A8088",
                "type": "color"
            },
            "700": {
                "value": "#2E5C61",
                "type": "color"
            },
            "800": {
                "value": "#213D40",
                "type": "color"
            },
            "900": {
                "value": "#162527",
                "type": "color"
            }
        }
    }
}

Palettes built on #175E66

Color Lab

Pairs with #175E66

UI roles & guardrails

In real applications

Scales

Every model

Export