What color is #0F3A4E?

#0F3A4E is a dark cyan-blue. In RGB it is rgb(15, 58, 78), and in HSL hsl(199, 68%, 18%).

Is #0F3A4E accessible as text?

On white, #0F3A4E has a contrast ratio of 12.10:1 (passes WCAG AA for body text); on black it is 1.74:1 (fails). For text placed on #0F3A4E, use white for the best readability.

What is the closest Tailwind color to #0F3A4E?

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

What colors go well with #0F3A4E?

#0F3A4E pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #4D220F. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #0F3A4E below.

Is #0F3A4E good for buttons?

#0F3A4E works well for buttons and highlights, but use white text on #0F3A4E — black text only reaches 1.74:1, below the 4.5:1 needed for normal-size labels.

Is #0F3A4E the same as CSS darkslategray?

No — #0F3A4E is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#0F3A4E Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #0F3A4E

Not just a swatch — here's how #0F3A4E works with other colors. Named schemes with #0F3A4E in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #0F3A4E Accent #A6C4C0 Surface #DEDABF Secondary #9AA0A0 Anchor #1F344A

Prussian Blue 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 #0F3A4E Secondary #AEB4B8 Surface #F1F2F0 Support #7B93A6 Anchor #2E3236

Prussian Blue 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 #0F3A4E Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #365A6D

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

Vintage Leather Lead · 5 colors

Lead #0F3A4E Secondary #6F5216 Surface #E2DCC0 Accent #385244 Anchor #56233D

Prussian Blue 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 #0F3A4E Secondary #505D64 Support #969386 Ink #16140F

Prussian Blue 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 Prussian Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #0F3A4E 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 33/100

Cool

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

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 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 33/100

Low

A faint retro warmth without tipping into sepia.

Luxury 68/100

High

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

Brand distinctiveness 22/100

Low

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

UI accent fit 38/100

Low

Workable accent with care around contrast.

Surface fit 46/100

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 #0F3A4E

For UI

For branding

For interior

For fashion

People also use #0F3A4E with

Pine Green Navy Bistre Platinum 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 #C1DDEA for cards and hover fills. Tint 80

Avoid beside #0F254D — 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 #0F3A4E 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: #0F3A4E;
  --color-base-rgb: 15 58 78;
  --color-base-oklch: oklch(33.0% 0.058 232.8);
  --color-50: #F2F9FD;
  --color-100: #DCF0F9;
  --color-200: #BBE0F2;
  --color-300: #8CC8E3;
  --color-400: #61AED1;
  --color-500: #3F90B6;
  --color-600: #37708B;
  --color-700: #2C5163;
  --color-800: #203641;
  --color-900: #152228;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  prussian-blue: {
    50: '#F2F9FD',
    100: '#DCF0F9',
    200: '#BBE0F2',
    300: '#8CC8E3',
    400: '#61AED1',
    500: '#3F90B6',
    600: '#37708B',
    700: '#2C5163',
    800: '#203641',
    900: '#152228',
  },
}

$base: #0F3A4E;
$base-ink: #FFFFFF;
$base-50: #F2F9FD;
$base-100: #DCF0F9;
$base-200: #BBE0F2;
$base-300: #8CC8E3;
$base-400: #61AED1;
$base-500: #3F90B6;
$base-600: #37708B;
$base-700: #2C5163;
$base-800: #203641;
$base-900: #152228;
$base-hover: #0C2E3E;
$base-subtle: #A0CCE1;

{
    "color": {
        "base": {
            "value": "#0F3A4E",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F9FD",
                "type": "color"
            },
            "100": {
                "value": "#DCF0F9",
                "type": "color"
            },
            "200": {
                "value": "#BBE0F2",
                "type": "color"
            },
            "300": {
                "value": "#8CC8E3",
                "type": "color"
            },
            "400": {
                "value": "#61AED1",
                "type": "color"
            },
            "500": {
                "value": "#3F90B6",
                "type": "color"
            },
            "600": {
                "value": "#37708B",
                "type": "color"
            },
            "700": {
                "value": "#2C5163",
                "type": "color"
            },
            "800": {
                "value": "#203641",
                "type": "color"
            },
            "900": {
                "value": "#152228",
                "type": "color"
            }
        }
    }
}