What color is #133EAD?

#133EAD is a dark, vivid blue. In RGB it is rgb(19, 62, 173), and in HSL hsl(223, 80%, 38%).

Is #133EAD accessible as text?

On white, #133EAD has a contrast ratio of 9.05:1 (passes WCAG AA for body text); on black it is 2.32:1 (fails). For text placed on #133EAD, use white for the best readability.

What is the closest Tailwind color to #133EAD?

The nearest Tailwind CSS token is blue-800 (#193CB8).

What colors go well with #133EAD?

#133EAD pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #AE8213. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #133EAD below.

Is #133EAD good for buttons?

#133EAD works well for buttons and highlights, but use white text on #133EAD — black text only reaches 2.32:1, below the 4.5:1 needed for normal-size labels.

Is #133EAD the same as CSS darkslateblue?

No — #133EAD is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

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

Palettes built on #133EAD

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

Coastal Morning Lead · 5 colors

Lead #133EAD Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

Cobalt Blue opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.

Tech Product Signal · 5 colors

Signal #133EAD Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #3A66CB

Cobalt 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 Cobalt Blue.

Vintage Leather Lead · 5 colors

Lead #133EAD Secondary #7F4536 Surface #EED7C2 Accent #375246 Anchor #57223A

Cobalt 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.

Berry & Cream Lead · 5 colors

Lead #133EAD Surface #F6E5D8 Anchor #5B2144 Accent #E5C2CA Secondary #322B2F

Cobalt Blue sits between cream and a deep berry here, softened by a blush accent and grounded by charcoal.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #133EAD Secondary #607399 Support #9D8F88 Ink #18140F

Cobalt 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 Cobalt Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #133EAD 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 8/100

Cool

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

Softness 29/100

Low

Firm and assertive — carries weight and contrast.

Depth 62/100

High

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

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 25/100

Low

Clean and current — no dusty, aged cast.

Luxury 59/100

Moderate

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

Brand distinctiveness 49/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 74/100

High

Strong interactive accent — visible and can carry a legible label.

Surface fit 13/100

Very low

Too saturated or mid-toned for big areas — keep it to accents.

Print safety 66/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #133EAD

For UI

For branding

For interior

For fashion

People also use #133EAD with

Picton Blue Egyptian Blue Dark Goldenrod Gainsboro 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 9.1:1. Use

Subtle surface Use #CDD7F2 for cards and hover fills. Tint 80

Avoid beside #1B13AE — 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 #133EAD 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: #133EAD;
  --color-base-rgb: 19 62 173;
  --color-base-oklch: oklch(41.5% 0.183 263.8);
  --color-50: #F1F4FE;
  --color-100: #D9E3FC;
  --color-200: #B6C8F7;
  --color-300: #84A1EB;
  --color-400: #577CDB;
  --color-500: #345CC1;
  --color-600: #2F4B93;
  --color-700: #273968;
  --color-800: #1D2844;
  --color-900: #141A29;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  cobalt-blue: {
    50: '#F1F4FE',
    100: '#D9E3FC',
    200: '#B6C8F7',
    300: '#84A1EB',
    400: '#577CDB',
    500: '#345CC1',
    600: '#2F4B93',
    700: '#273968',
    800: '#1D2844',
    900: '#141A29',
  },
}

$base: #133EAD;
$base-ink: #FFFFFF;
$base-50: #F1F4FE;
$base-100: #D9E3FC;
$base-200: #B6C8F7;
$base-300: #84A1EB;
$base-400: #577CDB;
$base-500: #345CC1;
$base-600: #2F4B93;
$base-700: #273968;
$base-800: #1D2844;
$base-900: #141A29;
$base-hover: #10338C;
$base-subtle: #B3C3EC;

{
    "color": {
        "base": {
            "value": "#133EAD",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F4FE",
                "type": "color"
            },
            "100": {
                "value": "#D9E3FC",
                "type": "color"
            },
            "200": {
                "value": "#B6C8F7",
                "type": "color"
            },
            "300": {
                "value": "#84A1EB",
                "type": "color"
            },
            "400": {
                "value": "#577CDB",
                "type": "color"
            },
            "500": {
                "value": "#345CC1",
                "type": "color"
            },
            "600": {
                "value": "#2F4B93",
                "type": "color"
            },
            "700": {
                "value": "#273968",
                "type": "color"
            },
            "800": {
                "value": "#1D2844",
                "type": "color"
            },
            "900": {
                "value": "#141A29",
                "type": "color"
            }
        }
    }
}

Palettes built on #133EAD

Color Lab

Pairs with #133EAD

UI roles & guardrails

In real applications

Scales

Every model

Export