What color is #1F3731?

#1F3731 is a very dark low-chroma cool gray with a subtle cool cast. In RGB it is rgb(31, 55, 49), and in HSL hsl(165, 28%, 17%).

Is #1F3731 accessible as text?

On white, #1F3731 has a contrast ratio of 12.73:1 (passes WCAG AA for body text); on black it is 1.65:1 (fails). For text placed on #1F3731, use white for the best readability.

What is the closest Tailwind color to #1F3731?

The nearest Tailwind CSS token is zinc-800 (#27272A).

What colors go well with #1F3731?

As a neutral, #1F3731 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 #1F3731 the same as CSS darkslategray?

No — #1F3731 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.

#1F3731 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #1F3731

Not just a swatch — here's how #1F3731 works with other colors. Named schemes with #1F3731 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #1F3731 Accent #A7C4BC Surface #E0D9BE Secondary #9AA0A0 Anchor #1B3549

Bottle Green 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 #1F3731 Secondary #ADB4B7 Surface #F1F2F0 Support #7994A4 Anchor #2D3236

Bottle Green keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.

Vintage Leather Lead · 5 colors

Lead #1F3731 Secondary #734F19 Surface #E4DCC0 Accent #3B5141 Anchor #5B231E

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

Luxury Packaging Feature · 5 colors

Feature #1F3731 Anchor #141210 Accent #BBA84C Secondary #1E2C29 Surface #F1EDE3

Bottle Green carries the depth in this luxury scheme, offset by a brass accent and near-black and held together by a deep neutral and an off-white surface.

Minimal Editorial Surface · 5 colors

Surface #F7F4EF Accent #1F3731 Secondary #505956 Support #979286 Ink #16140F

Bottle Green 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 Bottle Green carrying the quiet middle.

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Color Lab

How #1F3731 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 33/100

Low

Middle-weight — neither delicate nor heavy.

Depth 65/100

High

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

Naturalness 19/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 31/100

Low

A faint retro warmth without tipping into sepia.

Luxury 67/100

High

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

Brand distinctiveness 12/100

Very low

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

UI accent fit 28/100

Low

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

Surface fit 55/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 93/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #1F3731

For UI

For branding

For interior

For fashion

People also use #1F3731 with

Castleton Green Gunmetal Gray Bistre Platinum Dark Slate Gray

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 12.7:1. Use

Subtle surface Use #CCDDD9 for cards and hover fills. Tint 80

Avoid beside #1F3537 — 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 #1F3731 at work across the surfaces designers actually ship.

Website / UI

Northwind Sign up

Build faster.

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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: #1F3731;
  --color-base-rgb: 31 55 49;
  --color-base-oklch: oklch(31.5% 0.032 176.5);
  --color-50: #F5FAF9;
  --color-100: #E5F1EE;
  --color-200: #CBE2DC;
  --color-300: #A6CAC1;
  --color-400: #82B0A5;
  --color-500: #629387;
  --color-600: #4F726A;
  --color-700: #3C534D;
  --color-800: #2A3734;
  --color-900: #1B2220;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  bottle-green: {
    50: '#F5FAF9',
    100: '#E5F1EE',
    200: '#CBE2DC',
    300: '#A6CAC1',
    400: '#82B0A5',
    500: '#629387',
    600: '#4F726A',
    700: '#3C534D',
    800: '#2A3734',
    900: '#1B2220',
  },
}

$base: #1F3731;
$base-ink: #FFFFFF;
$base-50: #F5FAF9;
$base-100: #E5F1EE;
$base-200: #CBE2DC;
$base-300: #A6CAC1;
$base-400: #82B0A5;
$base-500: #629387;
$base-600: #4F726A;
$base-700: #3C534D;
$base-800: #2A3734;
$base-900: #1B2220;
$base-hover: #192C28;
$base-subtle: #B2CDC6;

{
    "color": {
        "base": {
            "value": "#1F3731",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5FAF9",
                "type": "color"
            },
            "100": {
                "value": "#E5F1EE",
                "type": "color"
            },
            "200": {
                "value": "#CBE2DC",
                "type": "color"
            },
            "300": {
                "value": "#A6CAC1",
                "type": "color"
            },
            "400": {
                "value": "#82B0A5",
                "type": "color"
            },
            "500": {
                "value": "#629387",
                "type": "color"
            },
            "600": {
                "value": "#4F726A",
                "type": "color"
            },
            "700": {
                "value": "#3C534D",
                "type": "color"
            },
            "800": {
                "value": "#2A3734",
                "type": "color"
            },
            "900": {
                "value": "#1B2220",
                "type": "color"
            }
        }
    }
}