What color is #31383A?

#31383A is a dark low-chroma cool gray with a subtle cool cast. In RGB it is rgb(49, 56, 58), and in HSL hsl(193, 8%, 21%).

Is #31383A accessible as text?

On white, #31383A has a contrast ratio of 11.95:1 (passes WCAG AA for body text); on black it is 1.76:1 (fails). For text placed on #31383A, use white for the best readability.

What is the closest Tailwind color to #31383A?

The nearest Tailwind CSS token is zinc-700 (#3F3F46).

What colors go well with #31383A?

As a neutral, #31383A 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 #31383A the same as CSS darkslategray?

No — #31383A 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.

#31383A Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #31383A

Not just a swatch — here's how #31383A works with other colors. Named schemes with #31383A in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #31383A Surface #14161A Highlight #F4F6F8 Secondary #596672 Accent #51585A

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

Vintage Leather Lead · 5 colors

Lead #31383A Secondary #705116 Surface #E3DCC0 Accent #395244 Anchor #56233E

Onyx plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.

Japanese Sand Base · 5 colors

Base #31383A Surface #ECEADC Highlight #F4F2E7 Secondary #B3B19F Ink #2A2723

Onyx 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.

Coastal Morning Lead · 5 colors

Lead #31383A Accent #A6C4BF Surface #DFDABF Secondary #9AA0A0 Anchor #1E3549

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

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #31383A Secondary #5A5D5D Support #969386 Ink #16140F

Onyx 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 Onyx carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #31383A 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 47/100

Neutral

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

Softness 37/100

Low

Middle-weight — neither delicate nor heavy.

Depth 62/100

High

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

Naturalness 1/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 24/100

Low

Clean and current — no dusty, aged cast.

Luxury 63/100

High

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

Brand distinctiveness 4/100

Very low

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

UI accent fit 26/100

Low

Weak as an action color — too pale, too dark or too muted to signal.

Surface fit 60/100

High

Calm enough for large fills — backgrounds, cards, sections.

Print safety 97/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #31383A

For UI

For branding

For interior

For fashion

People also use #31383A with

Outer Space Gunmetal Gray Onyx 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 11.9:1. Use

Subtle surface Use #D4D8D9 for cards and hover fills. Tint 80

Avoid beside #31353A — 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 #31383A 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: #31383A;
  --color-base-rgb: 49 56 58;
  --color-base-oklch: oklch(33.5% 0.010 216.8);
  --color-50: #F7F8F8;
  --color-100: #E9ECEC;
  --color-200: #D3D8D9;
  --color-300: #B2BBBD;
  --color-400: #929DA0;
  --color-500: #737E81;
  --color-600: #5C6466;
  --color-700: #44494B;
  --color-800: #2F3232;
  --color-900: #1D1F20;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  onyx: {
    50: '#F7F8F8',
    100: '#E9ECEC',
    200: '#D3D8D9',
    300: '#B2BBBD',
    400: '#929DA0',
    500: '#737E81',
    600: '#5C6466',
    700: '#44494B',
    800: '#2F3232',
    900: '#1D1F20',
  },
}

$base: #31383A;
$base-ink: #FFFFFF;
$base-50: #F7F8F8;
$base-100: #E9ECEC;
$base-200: #D3D8D9;
$base-300: #B2BBBD;
$base-400: #929DA0;
$base-500: #737E81;
$base-600: #5C6466;
$base-700: #44494B;
$base-800: #2F3232;
$base-900: #1D1F20;
$base-hover: #272D2E;
$base-subtle: #BFC5C6;

{
    "color": {
        "base": {
            "value": "#31383A",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F7F8F8",
                "type": "color"
            },
            "100": {
                "value": "#E9ECEC",
                "type": "color"
            },
            "200": {
                "value": "#D3D8D9",
                "type": "color"
            },
            "300": {
                "value": "#B2BBBD",
                "type": "color"
            },
            "400": {
                "value": "#929DA0",
                "type": "color"
            },
            "500": {
                "value": "#737E81",
                "type": "color"
            },
            "600": {
                "value": "#5C6466",
                "type": "color"
            },
            "700": {
                "value": "#44494B",
                "type": "color"
            },
            "800": {
                "value": "#2F3232",
                "type": "color"
            },
            "900": {
                "value": "#1D1F20",
                "type": "color"
            }
        }
    }
}

Palettes built on #31383A

Color Lab

Pairs with #31383A

UI roles & guardrails

In real applications

Scales

Every model

Export