What color is #10403E?

#10403E is a very dark cyan. In RGB it is rgb(16, 64, 62), and in HSL hsl(178, 60%, 16%).

Is #10403E accessible as text?

On white, #10403E has a contrast ratio of 11.51:1 (passes WCAG AA for body text); on black it is 1.82:1 (fails). For text placed on #10403E, use white for the best readability.

What is the closest Tailwind color to #10403E?

The nearest Tailwind CSS token is teal-900 (#0B4F4A).

What colors go well with #10403E?

#10403E pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #411012. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #10403E below.

Is #10403E good for buttons?

#10403E works well for buttons and highlights, but use white text on #10403E — black text only reaches 1.82:1, below the 4.5:1 needed for normal-size labels.

Is #10403E the same as CSS darkslategray?

No — #10403E is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#10403E Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #10403E

Not just a swatch — here's how #10403E works with other colors. Named schemes with #10403E in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #10403E Accent #A7C4BD Surface #E0DABE Secondary #9AA0A0 Anchor #1C3549

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 #10403E Secondary #AEB4B8 Surface #F1F2F0 Support #7994A4 Anchor #2E3236

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 #10403E Secondary #725018 Surface #E4DCC0 Accent #3A5142 Anchor #552341

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 #10403E Anchor #141210 Accent #B9A94D Secondary #1D2C2B 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 #F6F4EF Accent #10403E Secondary #536160 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.

Build a working theme in the generator →

Color Lab

How #10403E 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 38/100

Neutral

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

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 12/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 35/100

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 19/100

Very low

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

UI accent fit 38/100

Low

Workable accent with care around contrast.

Surface fit 48/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 88/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #10403E

For UI

For branding

For interior

For fashion

People also use #10403E with

Hunter Green Prussian Blue Oxblood 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 11.5:1. Use

Subtle surface Use #C2E7E5 for cards and hover fills. Tint 80

Avoid beside #103341 — 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 #10403E at work across the surfaces designers actually ship.

Website / UI

Northwind Sign up

Build faster.

A working theme, generated in seconds.

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: #10403E;
  --color-base-rgb: 16 64 62;
  --color-base-oklch: oklch(33.9% 0.050 191.1);
  --color-50: #F2FCFC;
  --color-100: #DEF8F7;
  --color-200: #BEEFED;
  --color-300: #91DEDC;
  --color-400: #67CBC7;
  --color-500: #46AFAC;
  --color-600: #3C8684;
  --color-700: #2F605E;
  --color-800: #223F3E;
  --color-900: #162726;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  bottle-green: {
    50: '#F2FCFC',
    100: '#DEF8F7',
    200: '#BEEFED',
    300: '#91DEDC',
    400: '#67CBC7',
    500: '#46AFAC',
    600: '#3C8684',
    700: '#2F605E',
    800: '#223F3E',
    900: '#162726',
  },
}

$base: #10403E;
$base-ink: #FFFFFF;
$base-50: #F2FCFC;
$base-100: #DEF8F7;
$base-200: #BEEFED;
$base-300: #91DEDC;
$base-400: #67CBC7;
$base-500: #46AFAC;
$base-600: #3C8684;
$base-700: #2F605E;
$base-800: #223F3E;
$base-900: #162726;
$base-hover: #0D3433;
$base-subtle: #A1DCDA;

{
    "color": {
        "base": {
            "value": "#10403E",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2FCFC",
                "type": "color"
            },
            "100": {
                "value": "#DEF8F7",
                "type": "color"
            },
            "200": {
                "value": "#BEEFED",
                "type": "color"
            },
            "300": {
                "value": "#91DEDC",
                "type": "color"
            },
            "400": {
                "value": "#67CBC7",
                "type": "color"
            },
            "500": {
                "value": "#46AFAC",
                "type": "color"
            },
            "600": {
                "value": "#3C8684",
                "type": "color"
            },
            "700": {
                "value": "#2F605E",
                "type": "color"
            },
            "800": {
                "value": "#223F3E",
                "type": "color"
            },
            "900": {
                "value": "#162726",
                "type": "color"
            }
        }
    }
}