What color is #1B41B0?

#1B41B0 is a medium, vivid blue. In RGB it is rgb(27, 65, 176), and in HSL hsl(225, 73%, 40%).

Is #1B41B0 accessible as text?

On white, #1B41B0 has a contrast ratio of 8.64:1 (passes WCAG AA for body text); on black it is 2.43:1 (fails). For text placed on #1B41B0, use white for the best readability.

What is the closest Tailwind color to #1B41B0?

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

What colors go well with #1B41B0?

#1B41B0 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #B08B1C. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #1B41B0 below.

Is #1B41B0 good for buttons?

#1B41B0 works well for buttons and highlights, but use white text on #1B41B0 — black text only reaches 2.43:1, below the 4.5:1 needed for normal-size labels.

Is #1B41B0 the same as CSS darkslateblue?

No — #1B41B0 is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#1B41B0 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #1B41B0

Not just a swatch — here's how #1B41B0 works with other colors. Named schemes with #1B41B0 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #1B41B0 Accent #A5C4C2 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 #1B41B0 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #4069CE

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 #1B41B0 Secondary #7F4536 Surface #EED7C2 Accent #365246 Anchor #58223A

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 #1B41B0 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 #1B41B0 Secondary #64769C 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 #1B41B0 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 29/100

Low

Firm and assertive — carries weight and contrast.

Depth 61/100

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 26/100

Low

A faint retro warmth without tipping into sepia.

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 78/100

High

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

Surface fit 12/100

Very low

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

Print safety 67/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #1B41B0

For UI

For branding

For interior

For fashion

People also use #1B41B0 with

Picton Blue Rebecca Purple 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 8.6:1. Use

Subtle surface Use #D0D8F0 for cards and hover fills. Tint 80

Avoid beside #281CB0 — 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 #1B41B0 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: #1B41B0;
  --color-base-rgb: 27 65 176;
  --color-base-oklch: oklch(42.6% 0.182 264.8);
  --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: {
  cobalt-blue: {
    50: '#F1F4FD',
    100: '#DBE3FA',
    200: '#B9C7F4',
    300: '#88A0E7',
    400: '#5D7BD5',
    500: '#3A5ABB',
    600: '#334A8E',
    700: '#2A3965',
    800: '#1F2842',
    900: '#151A28',
  },
}

$base: #1B41B0;
$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: #16348D;
$base-subtle: #B8C4EB;

{
    "color": {
        "base": {
            "value": "#1B41B0",
            "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"
            }
        }
    }
}

Palettes built on #1B41B0

Color Lab

Pairs with #1B41B0

UI roles & guardrails

In real applications

Scales

Every model

Export