What color is #313D40?

#313D40 is a dark low-chroma cool gray with a subtle cool cast. In RGB it is rgb(49, 61, 64), and in HSL hsl(192, 13%, 22%).

Is #313D40 accessible as text?

On white, #313D40 has a contrast ratio of 11.22:1 (passes WCAG AA for body text); on black it is 1.87:1 (fails). For text placed on #313D40, use white for the best readability.

What is the closest Tailwind color to #313D40?

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

What colors go well with #313D40?

As a neutral, #313D40 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 #313D40 the same as CSS darkslategray?

No — #313D40 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.

#313D40 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #313D40

Not just a swatch — here's how #313D40 works with other colors. Named schemes with #313D40 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #313D40 Surface #14161A Highlight #F4F6F8 Secondary #596672 Accent #525D60

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 #313D40 Secondary #705116 Surface #E3DCC0 Accent #395143 Anchor #56233F

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 #313D40 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 #313D40 Accent #A6C4BE Surface #DFDABE 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 #313D40 Secondary #5D6162 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.

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Color Lab

How #313D40 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 45/100

Neutral

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

Softness 38/100

Low

Middle-weight — neither delicate nor heavy.

Depth 61/100

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 26/100

Low

A faint retro warmth without tipping into sepia.

Luxury 63/100

High

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

Brand distinctiveness 6/100

Very low

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

UI accent fit 31/100

Low

Workable accent with care around contrast.

Surface fit 57/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 96/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #313D40

For UI

For branding

For interior

For fashion

People also use #313D40 with

Feldgrau 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 11.2:1. Use

Subtle surface Use #D3D9DB for cards and hover fills. Tint 80

Avoid beside #31383F — 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 #313D40 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: #313D40;
  --color-base-rgb: 49 61 64;
  --color-base-oklch: oklch(35.0% 0.017 214.6);
  --color-50: #F6F8F8;
  --color-100: #E8ECED;
  --color-200: #D1D9DB;
  --color-300: #AFBDC0;
  --color-400: #8E9FA4;
  --color-500: #6F8186;
  --color-600: #596669;
  --color-700: #424B4D;
  --color-800: #2D3234;
  --color-900: #1D2020;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  onyx: {
    50: '#F6F8F8',
    100: '#E8ECED',
    200: '#D1D9DB',
    300: '#AFBDC0',
    400: '#8E9FA4',
    500: '#6F8186',
    600: '#596669',
    700: '#424B4D',
    800: '#2D3234',
    900: '#1D2020',
  },
}

$base: #313D40;
$base-ink: #FFFFFF;
$base-50: #F6F8F8;
$base-100: #E8ECED;
$base-200: #D1D9DB;
$base-300: #AFBDC0;
$base-400: #8E9FA4;
$base-500: #6F8186;
$base-600: #596669;
$base-700: #424B4D;
$base-800: #2D3234;
$base-900: #1D2020;
$base-hover: #273033;
$base-subtle: #BDC7C9;

{
    "color": {
        "base": {
            "value": "#313D40",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F6F8F8",
                "type": "color"
            },
            "100": {
                "value": "#E8ECED",
                "type": "color"
            },
            "200": {
                "value": "#D1D9DB",
                "type": "color"
            },
            "300": {
                "value": "#AFBDC0",
                "type": "color"
            },
            "400": {
                "value": "#8E9FA4",
                "type": "color"
            },
            "500": {
                "value": "#6F8186",
                "type": "color"
            },
            "600": {
                "value": "#596669",
                "type": "color"
            },
            "700": {
                "value": "#424B4D",
                "type": "color"
            },
            "800": {
                "value": "#2D3234",
                "type": "color"
            },
            "900": {
                "value": "#1D2020",
                "type": "color"
            }
        }
    }
}