What color is #1F4E5B?

#1F4E5B is a dark cyan. In RGB it is rgb(31, 78, 91), and in HSL hsl(193, 49%, 24%).

Is #1F4E5B accessible as text?

On white, #1F4E5B has a contrast ratio of 9.13:1 (passes WCAG AA for body text); on black it is 2.30:1 (fails). For text placed on #1F4E5B, use white for the best readability.

What is the closest Tailwind color to #1F4E5B?

The nearest Tailwind CSS token is cyan-900 (#104E64).

What colors go well with #1F4E5B?

#1F4E5B pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #5B2C1F. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #1F4E5B below.

Is #1F4E5B good for buttons?

#1F4E5B works well for buttons and highlights, but use white text on #1F4E5B — black text only reaches 2.30:1, below the 4.5:1 needed for normal-size labels.

Is #1F4E5B the same as CSS darkslategray?

No — #1F4E5B is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#1F4E5B Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #1F4E5B

Not just a swatch — here's how #1F4E5B works with other colors. Named schemes with #1F4E5B in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #1F4E5B Accent #A6C4BF Surface #DFDABF Secondary #9AA0A0 Anchor #1E354A

Dark Slate Gray 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 #1F4E5B Secondary #AEB4B8 Surface #F1F2F0 Support #7B94A5 Anchor #2E3236

Dark Slate Gray 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 #1F4E5B Surface #14161A Highlight #F4F6F8 Secondary #596672 Accent #466F7C

Dark Slate Gray is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Dark Slate Gray.

Vintage Leather Lead · 5 colors

Lead #1F4E5B Secondary #705116 Surface #E3DCC0 Accent #395244 Anchor #56233E

Dark Slate Gray 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 #1F4E5B Secondary #627176 Support #969386 Ink #16140F

Dark Slate Gray 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 Dark Slate Gray carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #1F4E5B 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 34/100

Cool

Reads cool and recessive — calming, technical, good for trust-led UI.

Softness 39/100

Low

Middle-weight — neither delicate nor heavy.

Depth 58/100

Moderate

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

Naturalness 2/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 38/100

Low

A faint retro warmth without tipping into sepia.

Luxury 62/100

High

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

Brand distinctiveness 21/100

Low

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

UI accent fit 55/100

Moderate

Workable accent with care around contrast.

Surface fit 42/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 85/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #1F4E5B

For UI

For branding

For interior

For fashion

People also use #1F4E5B with

Pine Green Prussian Blue Espresso 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 9.1:1. Use

Subtle surface Use #CBE0E6 for cards and hover fills. Tint 80

Avoid beside #1F3A5B — 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 #1F4E5B at work across the surfaces designers actually ship.

Website / UI

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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: #1F4E5B;
  --color-base-rgb: 31 78 91;
  --color-base-oklch: oklch(39.7% 0.055 218.9);
  --color-50: #F3FAFB;
  --color-100: #E0F1F5;
  --color-200: #C2E1EA;
  --color-300: #98CAD7;
  --color-400: #70B0C2;
  --color-500: #4F93A6;
  --color-600: #42727F;
  --color-700: #34535B;
  --color-800: #25373C;
  --color-900: #182225;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  dark-slate-gray: {
    50: '#F3FAFB',
    100: '#E0F1F5',
    200: '#C2E1EA',
    300: '#98CAD7',
    400: '#70B0C2',
    500: '#4F93A6',
    600: '#42727F',
    700: '#34535B',
    800: '#25373C',
    900: '#182225',
  },
}

$base: #1F4E5B;
$base-ink: #FFFFFF;
$base-50: #F3FAFB;
$base-100: #E0F1F5;
$base-200: #C2E1EA;
$base-300: #98CAD7;
$base-400: #70B0C2;
$base-500: #4F93A6;
$base-600: #42727F;
$base-700: #34535B;
$base-800: #25373C;
$base-900: #182225;
$base-hover: #193F49;
$base-subtle: #AFD1DB;

{
    "color": {
        "base": {
            "value": "#1F4E5B",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3FAFB",
                "type": "color"
            },
            "100": {
                "value": "#E0F1F5",
                "type": "color"
            },
            "200": {
                "value": "#C2E1EA",
                "type": "color"
            },
            "300": {
                "value": "#98CAD7",
                "type": "color"
            },
            "400": {
                "value": "#70B0C2",
                "type": "color"
            },
            "500": {
                "value": "#4F93A6",
                "type": "color"
            },
            "600": {
                "value": "#42727F",
                "type": "color"
            },
            "700": {
                "value": "#34535B",
                "type": "color"
            },
            "800": {
                "value": "#25373C",
                "type": "color"
            },
            "900": {
                "value": "#182225",
                "type": "color"
            }
        }
    }
}

Palettes built on #1F4E5B

Color Lab

Pairs with #1F4E5B

UI roles & guardrails

In real applications

Scales

Every model

Export