What color is #133B4E?

#133B4E is a dark cyan-blue. In RGB it is rgb(19, 59, 78), and in HSL hsl(199, 61%, 19%).

Is #133B4E accessible as text?

On white, #133B4E has a contrast ratio of 11.91:1 (passes WCAG AA for body text); on black it is 1.76:1 (fails). For text placed on #133B4E, use white for the best readability.

What is the closest Tailwind color to #133B4E?

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

What colors go well with #133B4E?

#133B4E pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #4E2613. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #133B4E below.

Is #133B4E good for buttons?

#133B4E works well for buttons and highlights, but use white text on #133B4E — black text only reaches 1.76:1, below the 4.5:1 needed for normal-size labels.

Is #133B4E the same as CSS darkslategray?

No — #133B4E is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#133B4E Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #133B4E

Not just a swatch — here's how #133B4E works with other colors. Named schemes with #133B4E in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #133B4E 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 #133B4E 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 #133B4E Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #395B6E

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 #133B4E 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 #133B4E Secondary #515E65 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 #133B4E 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 33/100

Low

Middle-weight — neither delicate nor heavy.

Depth 64/100

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 67/100

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 38/100

Low

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 #133B4E

For UI

For branding

For interior

For fashion

People also use #133B4E 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 11.9:1. Use

Subtle surface Use #C4DCE8 for cards and hover fills. Tint 80

Avoid beside #13284E — 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 #133B4E 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: #133B4E;
  --color-base-rgb: 19 59 78;
  --color-base-oklch: oklch(33.4% 0.055 232.5);
  --color-50: #F2F9FC;
  --color-100: #DDEFF8;
  --color-200: #BDDFEF;
  --color-300: #90C6DF;
  --color-400: #67ACCB;
  --color-500: #458EB0;
  --color-600: #3B6F87;
  --color-700: #2F5060;
  --color-800: #22363F;
  --color-900: #162227;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  prussian-blue: {
    50: '#F2F9FC',
    100: '#DDEFF8',
    200: '#BDDFEF',
    300: '#90C6DF',
    400: '#67ACCB',
    500: '#458EB0',
    600: '#3B6F87',
    700: '#2F5060',
    800: '#22363F',
    900: '#162227',
  },
}

$base: #133B4E;
$base-ink: #FFFFFF;
$base-50: #F2F9FC;
$base-100: #DDEFF8;
$base-200: #BDDFEF;
$base-300: #90C6DF;
$base-400: #67ACCB;
$base-500: #458EB0;
$base-600: #3B6F87;
$base-700: #2F5060;
$base-800: #22363F;
$base-900: #162227;
$base-hover: #0F2F3E;
$base-subtle: #A4CCDE;

{
    "color": {
        "base": {
            "value": "#133B4E",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F9FC",
                "type": "color"
            },
            "100": {
                "value": "#DDEFF8",
                "type": "color"
            },
            "200": {
                "value": "#BDDFEF",
                "type": "color"
            },
            "300": {
                "value": "#90C6DF",
                "type": "color"
            },
            "400": {
                "value": "#67ACCB",
                "type": "color"
            },
            "500": {
                "value": "#458EB0",
                "type": "color"
            },
            "600": {
                "value": "#3B6F87",
                "type": "color"
            },
            "700": {
                "value": "#2F5060",
                "type": "color"
            },
            "800": {
                "value": "#22363F",
                "type": "color"
            },
            "900": {
                "value": "#162227",
                "type": "color"
            }
        }
    }
}