What color is #143F4E?

#143F4E is a dark cyan-blue. In RGB it is rgb(20, 63, 78), and in HSL hsl(196, 59%, 19%).

Is #143F4E accessible as text?

On white, #143F4E has a contrast ratio of 11.35:1 (passes WCAG AA for body text); on black it is 1.85:1 (fails). For text placed on #143F4E, use white for the best readability.

What is the closest Tailwind color to #143F4E?

The nearest Tailwind CSS token is cyan-950 (#053345).

What colors go well with #143F4E?

#143F4E pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #4D2314. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #143F4E below.

Is #143F4E good for buttons?

#143F4E works well for buttons and highlights, but use white text on #143F4E — black text only reaches 1.85:1, below the 4.5:1 needed for normal-size labels.

Is #143F4E the same as CSS darkslategray?

No — #143F4E is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#143F4E Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #143F4E

Not just a swatch — here's how #143F4E works with other colors. Named schemes with #143F4E in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #143F4E Accent #A6C4BF Surface #DEDABF Secondary #9AA0A0 Anchor #1E344A

Charcoal 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 #143F4E Secondary #AEB4B8 Surface #F1F2F0 Support #7B93A5 Anchor #2E3236

Charcoal 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 #143F4E Surface #14161A Highlight #F4F6F8 Secondary #596672 Accent #3B5F6E

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

Vintage Leather Lead · 5 colors

Lead #143F4E Secondary #6F5116 Surface #E2DCC0 Accent #385244 Anchor #56233E

Charcoal 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 #143F4E Secondary #546267 Support #969386 Ink #16140F

Charcoal 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 Charcoal carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #143F4E 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 34/100

Low

Middle-weight — neither delicate nor heavy.

Depth 63/100

High

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

Naturalness 1/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 34/100

Low

A faint retro warmth without tipping into sepia.

Luxury 66/100

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 41/100

Moderate

Workable accent with care around contrast.

Surface fit 46/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 86/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #143F4E

For UI

For branding

For interior

For fashion

People also use #143F4E with

Pine Green Navy 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 11.3:1. Use

Subtle surface Use #C4DEE7 for cards and hover fills. Tint 80

Avoid beside #142B4D — 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 #143F4E 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: #143F4E;
  --color-base-rgb: 20 63 78;
  --color-base-oklch: oklch(34.5% 0.053 224.8);
  --color-50: #F2FAFC;
  --color-100: #DEF1F7;
  --color-200: #BEE1EE;
  --color-300: #92C9DE;
  --color-400: #68B0CA;
  --color-500: #4693AE;
  --color-600: #3C7286;
  --color-700: #30535F;
  --color-800: #22373F;
  --color-900: #172227;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  charcoal: {
    50: '#F2FAFC',
    100: '#DEF1F7',
    200: '#BEE1EE',
    300: '#92C9DE',
    400: '#68B0CA',
    500: '#4693AE',
    600: '#3C7286',
    700: '#30535F',
    800: '#22373F',
    900: '#172227',
  },
}

$base: #143F4E;
$base-ink: #FFFFFF;
$base-50: #F2FAFC;
$base-100: #DEF1F7;
$base-200: #BEE1EE;
$base-300: #92C9DE;
$base-400: #68B0CA;
$base-500: #4693AE;
$base-600: #3C7286;
$base-700: #30535F;
$base-800: #22373F;
$base-900: #172227;
$base-hover: #10313E;
$base-subtle: #A5CEDD;

{
    "color": {
        "base": {
            "value": "#143F4E",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2FAFC",
                "type": "color"
            },
            "100": {
                "value": "#DEF1F7",
                "type": "color"
            },
            "200": {
                "value": "#BEE1EE",
                "type": "color"
            },
            "300": {
                "value": "#92C9DE",
                "type": "color"
            },
            "400": {
                "value": "#68B0CA",
                "type": "color"
            },
            "500": {
                "value": "#4693AE",
                "type": "color"
            },
            "600": {
                "value": "#3C7286",
                "type": "color"
            },
            "700": {
                "value": "#30535F",
                "type": "color"
            },
            "800": {
                "value": "#22373F",
                "type": "color"
            },
            "900": {
                "value": "#172227",
                "type": "color"
            }
        }
    }
}