What color is #1F4AC9?

#1F4AC9 is a medium, vivid blue. In RGB it is rgb(31, 74, 201), and in HSL hsl(225, 73%, 45%).

Is #1F4AC9 accessible as text?

On white, #1F4AC9 has a contrast ratio of 7.29:1 (passes WCAG AA for body text); on black it is 2.88:1 (fails). For text placed on #1F4AC9, use white for the best readability.

What is the closest Tailwind color to #1F4AC9?

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

What colors go well with #1F4AC9?

#1F4AC9 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #C79D1F. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #1F4AC9 below.

Is #1F4AC9 good for buttons?

#1F4AC9 works well for buttons and highlights, but use white text on #1F4AC9 — black text only reaches 2.88:1, below the 4.5:1 needed for normal-size labels.

Is #1F4AC9 the same as CSS royalblue?

No — #1F4AC9 is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#1F4AC9 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #1F4AC9

Not just a swatch — here's how #1F4AC9 works with other colors. Named schemes with #1F4AC9 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #1F4AC9 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #4574E7

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

Coastal Morning Lead · 5 colors

Lead #1F4AC9 Accent #A5C4C2 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

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

Berry & Cream Lead · 5 colors

Lead #1F4AC9 Surface #F6E5D8 Anchor #5B2144 Accent #E5C2CA Secondary #322B2F

Cerulean 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 #1F4AC9 Secondary #6E82AE Support #9D8F88 Ink #18140F

Cerulean 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 Cerulean carrying the quiet middle.

Sunset Warmth Glow · 5 colors

Glow #1F4AC9 Secondary #E76A75 Accent #F79251 Anchor #573B58 Surface #F7E7D7

Cerulean glows at the center of this sunset palette, joined by coral and gold, deepened by a plum anchor and cooled with cream.

Build a working theme in the generator →

Color Lab

How #1F4AC9 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 9/100

Cool

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

Softness 30/100

Low

Firm and assertive — carries weight and contrast.

Depth 57/100

Moderate

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

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 21/100

Low

Clean and current — no dusty, aged cast.

Luxury 54/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 78/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 80/100

Very high

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

Surface fit 10/100

Very low

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

Print safety 63/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #1F4AC9

For UI

For branding

For interior

For fashion

People also use #1F4AC9 with

Lagoon Blue Grape Dijon 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 7.3:1. Use

Subtle surface Use #D4DCF2 for cards and hover fills. Tint 80

Avoid beside #2D1FC7 — 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 #1F4AC9 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: #1F4AC9;
  --color-base-rgb: 31 74 201;
  --color-base-oklch: oklch(46.8% 0.202 264.8);
  --color-50: #F1F4FD;
  --color-100: #DBE3FA;
  --color-200: #B9C7F4;
  --color-300: #88A0E7;
  --color-400: #5D7BD5;
  --color-500: #3A5ABB;
  --color-600: #334A8E;
  --color-700: #2A3965;
  --color-800: #1F2842;
  --color-900: #151A28;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  cerulean: {
    50: '#F1F4FD',
    100: '#DBE3FA',
    200: '#B9C7F4',
    300: '#88A0E7',
    400: '#5D7BD5',
    500: '#3A5ABB',
    600: '#334A8E',
    700: '#2A3965',
    800: '#1F2842',
    900: '#151A28',
  },
}

$base: #1F4AC9;
$base-ink: #FFFFFF;
$base-50: #F1F4FD;
$base-100: #DBE3FA;
$base-200: #B9C7F4;
$base-300: #88A0E7;
$base-400: #5D7BD5;
$base-500: #3A5ABB;
$base-600: #334A8E;
$base-700: #2A3965;
$base-800: #1F2842;
$base-900: #151A28;
$base-hover: #193A9F;
$base-subtle: #BEC9EC;

{
    "color": {
        "base": {
            "value": "#1F4AC9",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F4FD",
                "type": "color"
            },
            "100": {
                "value": "#DBE3FA",
                "type": "color"
            },
            "200": {
                "value": "#B9C7F4",
                "type": "color"
            },
            "300": {
                "value": "#88A0E7",
                "type": "color"
            },
            "400": {
                "value": "#5D7BD5",
                "type": "color"
            },
            "500": {
                "value": "#3A5ABB",
                "type": "color"
            },
            "600": {
                "value": "#334A8E",
                "type": "color"
            },
            "700": {
                "value": "#2A3965",
                "type": "color"
            },
            "800": {
                "value": "#1F2842",
                "type": "color"
            },
            "900": {
                "value": "#151A28",
                "type": "color"
            }
        }
    }
}