What color is #313C49?

#313C49 is a dark low-chroma blue-gray with a subtle blue cast. In RGB it is rgb(49, 60, 73), and in HSL hsl(213, 20%, 24%).

Is #313C49 accessible as text?

On white, #313C49 has a contrast ratio of 11.21:1 (passes WCAG AA for body text); on black it is 1.87:1 (fails). For text placed on #313C49, use white for the best readability.

What is the closest Tailwind color to #313C49?

The nearest Tailwind CSS token is gray-700 (#364153).

What colors go well with #313C49?

As a neutral, #313C49 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 #313C49 the same as CSS darkslategray?

No — #313C49 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.

#313C49 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #313C49

Not just a swatch — here's how #313C49 works with other colors. Named schemes with #313C49 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #313C49 Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

Onyx 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 #313C49 Secondary #AEB4B8 Surface #F1F2F0 Support #7D93A6 Anchor #2E3236

Onyx 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 #313C49 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #525C69

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 #313C49 Secondary #7F4537 Surface #E1DDC1 Accent #375246 Anchor #57233B

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.

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #313C49 Secondary #5D6166 Support #959386 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 #313C49 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 43/100

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 29/100

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 10/100

Very low

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

UI accent fit 34/100

Low

Workable accent with care around contrast.

Surface fit 54/100

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 #313C49

For UI

For branding

For interior

For fashion

People also use #313C49 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 11.2:1. Use

Subtle surface Use #D3D8DE for cards and hover fills. Tint 80

Avoid beside #313449 — 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 #313C49 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: #313C49;
  --color-base-rgb: 49 60 73;
  --color-base-oklch: oklch(35.2% 0.027 252.8);
  --color-50: #F6F7F9;
  --color-100: #E6EAEF;
  --color-200: #CED5DE;
  --color-300: #ABB6C5;
  --color-400: #8897AA;
  --color-500: #69798C;
  --color-600: #54606D;
  --color-700: #3F474F;
  --color-800: #2C3035;
  --color-900: #1C1E21;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  onyx: {
    50: '#F6F7F9',
    100: '#E6EAEF',
    200: '#CED5DE',
    300: '#ABB6C5',
    400: '#8897AA',
    500: '#69798C',
    600: '#54606D',
    700: '#3F474F',
    800: '#2C3035',
    900: '#1C1E21',
  },
}

$base: #313C49;
$base-ink: #FFFFFF;
$base-50: #F6F7F9;
$base-100: #E6EAEF;
$base-200: #CED5DE;
$base-300: #ABB6C5;
$base-400: #8897AA;
$base-500: #69798C;
$base-600: #54606D;
$base-700: #3F474F;
$base-800: #2C3035;
$base-900: #1C1E21;
$base-hover: #27303B;
$base-subtle: #BCC4CE;

{
    "color": {
        "base": {
            "value": "#313C49",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F6F7F9",
                "type": "color"
            },
            "100": {
                "value": "#E6EAEF",
                "type": "color"
            },
            "200": {
                "value": "#CED5DE",
                "type": "color"
            },
            "300": {
                "value": "#ABB6C5",
                "type": "color"
            },
            "400": {
                "value": "#8897AA",
                "type": "color"
            },
            "500": {
                "value": "#69798C",
                "type": "color"
            },
            "600": {
                "value": "#54606D",
                "type": "color"
            },
            "700": {
                "value": "#3F474F",
                "type": "color"
            },
            "800": {
                "value": "#2C3035",
                "type": "color"
            },
            "900": {
                "value": "#1C1E21",
                "type": "color"
            }
        }
    }
}