What color is #313A42?

#313A42 is a dark low-chroma blue-gray with a subtle blue cast. In RGB it is rgb(49, 58, 66), and in HSL hsl(208, 15%, 23%).

Is #313A42 accessible as text?

On white, #313A42 has a contrast ratio of 11.57:1 (passes WCAG AA for body text); on black it is 1.81:1 (fails). For text placed on #313A42, use white for the best readability.

What is the closest Tailwind color to #313A42?

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

What colors go well with #313A42?

As a neutral, #313A42 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 #313A42 the same as CSS darkslategray?

No — #313A42 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.

#313A42 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #313A42

Not just a swatch — here's how #313A42 works with other colors. Named schemes with #313A42 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #313A42 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #515A62

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 #313A42 Secondary #7F4438 Surface #E1DDC0 Accent #375245 Anchor #57233C

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 #313A42 Surface #ECEADC Highlight #F4F2E7 Secondary #B2B2A0 Ink #2A2823

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 #313A42 Accent #A5C4C0 Surface #DEDBBF Secondary #9AA0A0 Anchor #20344A

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 #313A42 Secondary #5C5F62 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 #313A42 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 37/100

Low

Middle-weight — neither delicate nor heavy.

Depth 61/100

High

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

Naturalness 0/100

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 7/100

Very low

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

UI accent fit 30/100

Low

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

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 #313A42

For UI

For branding

For interior

For fashion

People also use #313A42 with

Feldgrau Gunmetal Gray Taupe Gainsboro 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 11.6:1. Use

Subtle surface Use #D3D8DC for cards and hover fills. Tint 80

Avoid beside #323543 — 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 #313A42 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: #313A42;
  --color-base-rgb: 49 58 66;
  --color-base-oklch: oklch(34.3% 0.019 245.2);
  --color-50: #F6F7F9;
  --color-100: #E7EBEE;
  --color-200: #D0D7DC;
  --color-300: #AEB8C1;
  --color-400: #8D9AA5;
  --color-500: #6D7B88;
  --color-600: #58626A;
  --color-700: #41484D;
  --color-800: #2D3134;
  --color-900: #1D1F21;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  onyx: {
    50: '#F6F7F9',
    100: '#E7EBEE',
    200: '#D0D7DC',
    300: '#AEB8C1',
    400: '#8D9AA5',
    500: '#6D7B88',
    600: '#58626A',
    700: '#41484D',
    800: '#2D3134',
    900: '#1D1F21',
  },
}

$base: #313A42;
$base-ink: #FFFFFF;
$base-50: #F6F7F9;
$base-100: #E7EBEE;
$base-200: #D0D7DC;
$base-300: #AEB8C1;
$base-400: #8D9AA5;
$base-500: #6D7B88;
$base-600: #58626A;
$base-700: #41484D;
$base-800: #2D3134;
$base-900: #1D1F21;
$base-hover: #282F36;
$base-subtle: #BDC5CB;

{
    "color": {
        "base": {
            "value": "#313A42",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F6F7F9",
                "type": "color"
            },
            "100": {
                "value": "#E7EBEE",
                "type": "color"
            },
            "200": {
                "value": "#D0D7DC",
                "type": "color"
            },
            "300": {
                "value": "#AEB8C1",
                "type": "color"
            },
            "400": {
                "value": "#8D9AA5",
                "type": "color"
            },
            "500": {
                "value": "#6D7B88",
                "type": "color"
            },
            "600": {
                "value": "#58626A",
                "type": "color"
            },
            "700": {
                "value": "#41484D",
                "type": "color"
            },
            "800": {
                "value": "#2D3134",
                "type": "color"
            },
            "900": {
                "value": "#1D1F21",
                "type": "color"
            }
        }
    }
}