What color is #3F554B?

#3F554B is a dark low-chroma cool gray with a subtle cool cast. In RGB it is rgb(63, 85, 75), and in HSL hsl(153, 15%, 29%).

Is #3F554B accessible as text?

On white, #3F554B has a contrast ratio of 8.04:1 (passes WCAG AA for body text); on black it is 2.61:1 (fails). For text placed on #3F554B, use white for the best readability.

What is the closest Tailwind color to #3F554B?

The nearest Tailwind CSS token is neutral-600 (#525252).

What colors go well with #3F554B?

As a neutral, #3F554B 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 #3F554B the same as CSS darkslategray?

No — #3F554B 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.

#3F554B Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #3F554B

Not just a swatch — here's how #3F554B works with other colors. Named schemes with #3F554B in its natural role, and a note on why the supporting colors balance it.

Vintage Leather Lead · 5 colors

Lead #3F554B Secondary #744F1A Surface #E5DBC0 Accent #3B5141 Anchor #5B2320

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.

Modern Café Dominant · 5 colors

Dominant #3F554B Anchor #382B1E Surface #EDE4D0 Accent #859B6F Secondary #3A3833

Dark Slate Gray anchors this café scheme as the warm mid-tone, lifted by latte cream and a muted sage accent and grounded by espresso brown and a warm charcoal.

Japanese Sand Base · 5 colors

Base #3F554B Surface #EDEADC Highlight #F5F1E7 Secondary #B6B09F Ink #2A2723

Dark Slate Gray sets a calm, sun-bleached base here, wrapped in bone and paper off-whites and a soft greige, with a single ink accent for wabi-sabi restraint.

Minimal Editorial Surface · 5 colors

Surface #F7F4EF Accent #3F554B Secondary #717975 Support #989286 Ink #17140F

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.

Tech Product Signal · 5 colors

Signal #3F554B Surface #13161A Highlight #F4F6F8 Secondary #586771 Accent #62776D

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.

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Color Lab

How #3F554B 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 46/100

Neutral

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

Softness 44/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 54/100

Moderate

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

Naturalness 29/100

Low

Loosely natural — an earthy edge without being rustic.

Vintage feel 40/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 58/100

Moderate

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

Brand distinctiveness 12/100

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 94/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #3F554B

For UI

For branding

For interior

For fashion

People also use #3F554B with

Dark Olive Green Outer Space Eggplant 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 8.0:1. Use

Subtle surface Use #D7DFDB for cards and hover fills. Tint 80

Avoid beside #3F5552 — 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 #3F554B at work across the surfaces designers actually ship.

Website / UI

Northwind Sign up

Build faster.

A working theme, generated in seconds.

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: #3F554B;
  --color-base-rgb: 63 85 75;
  --color-base-oklch: oklch(42.8% 0.032 165.3);
  --color-50: #F6F9F7;
  --color-100: #E7EEEB;
  --color-200: #D0DCD7;
  --color-300: #AEC1B9;
  --color-400: #8DA59A;
  --color-500: #6D887C;
  --color-600: #586A62;
  --color-700: #414D48;
  --color-800: #2D3431;
  --color-900: #1D211F;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  dark-slate-gray: {
    50: '#F6F9F7',
    100: '#E7EEEB',
    200: '#D0DCD7',
    300: '#AEC1B9',
    400: '#8DA59A',
    500: '#6D887C',
    600: '#586A62',
    700: '#414D48',
    800: '#2D3431',
    900: '#1D211F',
  },
}

$base: #3F554B;
$base-ink: #FFFFFF;
$base-50: #F6F9F7;
$base-100: #E7EEEB;
$base-200: #D0DCD7;
$base-300: #AEC1B9;
$base-400: #8DA59A;
$base-500: #6D887C;
$base-600: #586A62;
$base-700: #414D48;
$base-800: #2D3431;
$base-900: #1D211F;
$base-hover: #32443C;
$base-subtle: #C2CFC9;

{
    "color": {
        "base": {
            "value": "#3F554B",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F6F9F7",
                "type": "color"
            },
            "100": {
                "value": "#E7EEEB",
                "type": "color"
            },
            "200": {
                "value": "#D0DCD7",
                "type": "color"
            },
            "300": {
                "value": "#AEC1B9",
                "type": "color"
            },
            "400": {
                "value": "#8DA59A",
                "type": "color"
            },
            "500": {
                "value": "#6D887C",
                "type": "color"
            },
            "600": {
                "value": "#586A62",
                "type": "color"
            },
            "700": {
                "value": "#414D48",
                "type": "color"
            },
            "800": {
                "value": "#2D3431",
                "type": "color"
            },
            "900": {
                "value": "#1D211F",
                "type": "color"
            }
        }
    }
}

Palettes built on #3F554B

Color Lab

Pairs with #3F554B

UI roles & guardrails

In real applications

Scales

Every model

Export