What color is #3E555B?

#3E555B is a dark low-chroma cool gray with a subtle cool cast. In RGB it is rgb(62, 85, 91), and in HSL hsl(192, 19%, 30%).

Is #3E555B accessible as text?

On white, #3E555B has a contrast ratio of 7.91:1 (passes WCAG AA for body text); on black it is 2.66:1 (fails). For text placed on #3E555B, use white for the best readability.

What is the closest Tailwind color to #3E555B?

The nearest Tailwind CSS token is gray-600 (#4A5565).

What colors go well with #3E555B?

As a neutral, #3E555B pairs cleanly with white, off-white and light grays for text, and sits under accent hues like blue, violet, emerald or warm orange — use it as a dark surface or high-contrast base and let the accent carry the color.

Is #3E555B the same as CSS darkslategray?

No — #3E555B is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color by perceptual color distance — it sits in a different color family, so treat it as a rough reference, not a match.

#3E555B Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #3E555B

Not just a swatch — here's how #3E555B works with other colors. Named schemes with #3E555B in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #3E555B Accent #A6C4BE Surface #DFDABE Secondary #9AA0A0 Anchor #1E3549

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 #3E555B Secondary #AEB4B8 Surface #F1F2F0 Support #7B94A5 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 #3E555B Surface #14161A Highlight #F4F6F8 Secondary #596672 Accent #61777C

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 #3E555B Secondary #705116 Surface #E3DCC0 Accent #395143 Anchor #56233E

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 #3E555B Secondary #727A7C Support #969386 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.

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Color Lab

How #3E555B 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 41/100

Neutral

Balanced temperature — flexible, sits between warm and cool schemes.

Softness 44/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 53/100

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 34/100

Low

A faint retro warmth without tipping into sepia.

Luxury 57/100

Moderate

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

Brand distinctiveness 11/100

Very low

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

UI accent fit 52/100

Moderate

Workable accent with care around contrast.

Surface fit 48/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 92/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #3E555B

For UI

For branding

For interior

For fashion

People also use #3E555B with

Myrtle Green Charcoal Liver Platinum Outer Space

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 7.9:1. Use

Subtle surface Use #D6DEE0 for cards and hover fills. Tint 80

Avoid beside #3E4C5B — 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 #3E555B 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: #3E555B;
  --color-base-rgb: 62 85 91;
  --color-base-oklch: oklch(43.3% 0.030 215.6);
  --color-50: #F6F8F9;
  --color-100: #E7EDEF;
  --color-200: #CEDBDE;
  --color-300: #ABBFC4;
  --color-400: #89A2A9;
  --color-500: #6A848B;
  --color-600: #55686D;
  --color-700: #404C4F;
  --color-800: #2C3335;
  --color-900: #1C2021;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  dark-slate-gray: {
    50: '#F6F8F9',
    100: '#E7EDEF',
    200: '#CEDBDE',
    300: '#ABBFC4',
    400: '#89A2A9',
    500: '#6A848B',
    600: '#55686D',
    700: '#404C4F',
    800: '#2C3335',
    900: '#1C2021',
  },
}

$base: #3E555B;
$base-ink: #FFFFFF;
$base-50: #F6F8F9;
$base-100: #E7EDEF;
$base-200: #CEDBDE;
$base-300: #ABBFC4;
$base-400: #89A2A9;
$base-500: #6A848B;
$base-600: #55686D;
$base-700: #404C4F;
$base-800: #2C3335;
$base-900: #1C2021;
$base-hover: #324449;
$base-subtle: #C2CED1;

{
    "color": {
        "base": {
            "value": "#3E555B",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F6F8F9",
                "type": "color"
            },
            "100": {
                "value": "#E7EDEF",
                "type": "color"
            },
            "200": {
                "value": "#CEDBDE",
                "type": "color"
            },
            "300": {
                "value": "#ABBFC4",
                "type": "color"
            },
            "400": {
                "value": "#89A2A9",
                "type": "color"
            },
            "500": {
                "value": "#6A848B",
                "type": "color"
            },
            "600": {
                "value": "#55686D",
                "type": "color"
            },
            "700": {
                "value": "#404C4F",
                "type": "color"
            },
            "800": {
                "value": "#2C3335",
                "type": "color"
            },
            "900": {
                "value": "#1C2021",
                "type": "color"
            }
        }
    }
}

Palettes built on #3E555B

Color Lab

Pairs with #3E555B

UI roles & guardrails

In real applications

Scales

Every model

Export