What color is #313643?

#313643 is a dark low-chroma blue-gray with a subtle blue cast. In RGB it is rgb(49, 54, 67), and in HSL hsl(223, 16%, 23%).

Is #313643 accessible as text?

On white, #313643 has a contrast ratio of 12.07:1 (passes WCAG AA for body text); on black it is 1.74:1 (fails). For text placed on #313643, use white for the best readability.

What is the closest Tailwind color to #313643?

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

What colors go well with #313643?

As a neutral, #313643 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 #313643 the same as CSS darkslategray?

No — #313643 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.

#313643 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #313643

Not just a swatch — here's how #313643 works with other colors. Named schemes with #313643 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #313643 Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

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 #313643 Secondary #AEB4B8 Surface #F1F2F0 Support #7D92A7 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 #313643 Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #515663

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 #313643 Secondary #7F4535 Surface #EED7C2 Accent #365246 Anchor #58223A

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 #F8F4EF Accent #313643 Secondary #5A5C61 Support #9D8F88 Ink #18140F

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 #313643 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 44/100

Neutral

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

Softness 35/100

Low

Middle-weight — neither delicate nor heavy.

Depth 63/100

High

Deep and grounding — anchors a layout, strong dark-mode base.

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 28/100

Low

A faint retro warmth without tipping into sepia.

Luxury 65/100

High

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

Brand distinctiveness 9/100

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 56/100

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 #313643

For UI

For branding

For interior

For fashion

People also use #313643 with

Iron Gray 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 12.1:1. Use

Subtle surface Use #D3D6DC for cards and hover fills. Tint 80

Avoid beside #323144 — 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 #313643 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: #313643;
  --color-base-rgb: 49 54 67;
  --color-base-oklch: oklch(33.4% 0.024 268.6);
  --color-50: #F6F7F9;
  --color-100: #E7E9EE;
  --color-200: #D0D3DD;
  --color-300: #ADB3C2;
  --color-400: #8C93A6;
  --color-500: #6C7488;
  --color-600: #575D6B;
  --color-700: #41454E;
  --color-800: #2D2F34;
  --color-900: #1C1E21;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  onyx: {
    50: '#F6F7F9',
    100: '#E7E9EE',
    200: '#D0D3DD',
    300: '#ADB3C2',
    400: '#8C93A6',
    500: '#6C7488',
    600: '#575D6B',
    700: '#41454E',
    800: '#2D2F34',
    900: '#1C1E21',
  },
}

$base: #313643;
$base-ink: #FFFFFF;
$base-50: #F6F7F9;
$base-100: #E7E9EE;
$base-200: #D0D3DD;
$base-300: #ADB3C2;
$base-400: #8C93A6;
$base-500: #6C7488;
$base-600: #575D6B;
$base-700: #41454E;
$base-800: #2D2F34;
$base-900: #1C1E21;
$base-hover: #272C36;
$base-subtle: #BDC1CB;

{
    "color": {
        "base": {
            "value": "#313643",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F6F7F9",
                "type": "color"
            },
            "100": {
                "value": "#E7E9EE",
                "type": "color"
            },
            "200": {
                "value": "#D0D3DD",
                "type": "color"
            },
            "300": {
                "value": "#ADB3C2",
                "type": "color"
            },
            "400": {
                "value": "#8C93A6",
                "type": "color"
            },
            "500": {
                "value": "#6C7488",
                "type": "color"
            },
            "600": {
                "value": "#575D6B",
                "type": "color"
            },
            "700": {
                "value": "#41454E",
                "type": "color"
            },
            "800": {
                "value": "#2D2F34",
                "type": "color"
            },
            "900": {
                "value": "#1C1E21",
                "type": "color"
            }
        }
    }
}