What color is #370EB4?

#370EB4 is a dark, vivid indigo. In RGB it is rgb(55, 14, 180), and in HSL hsl(255, 86%, 38%).

Is #370EB4 accessible as text?

On white, #370EB4 has a contrast ratio of 11.14:1 (passes WCAG AA for body text); on black it is 1.88:1 (fails). For text placed on #370EB4, use white for the best readability.

What is the closest Tailwind color to #370EB4?

The nearest Tailwind CSS token is indigo-800 (#372AAC).

What colors go well with #370EB4?

#370EB4 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #8BB40E. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #370EB4 below.

Is #370EB4 good for buttons?

#370EB4 works well for buttons and highlights, but use white text on #370EB4 — black text only reaches 1.88:1, below the 4.5:1 needed for normal-size labels.

Is #370EB4 the same as CSS mediumblue?

No — #370EB4 is not the CSS named color mediumblue, but mediumblue (#0000CD) is the closest CSS named color.

#370EB4 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #370EB4

Not just a swatch — here's how #370EB4 works with other colors. Named schemes with #370EB4 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #370EB4 Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #514AD2

Egyptian 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 Egyptian Blue.

Berry & Cream Lead · 5 colors

Lead #370EB4 Surface #F6E5D8 Anchor #5B2142 Accent #E5C2C9 Secondary #322B2F

Egyptian 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 #370EB4 Secondary #5F6496 Support #9D9088 Ink #18140F

Egyptian 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 Egyptian Blue carrying the quiet middle.

Coastal Morning Lead · 5 colors

Lead #370EB4 Accent #A5C4C2 Surface #EAD5BF Secondary #9AA0A1 Anchor #22344A

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

Sunset Warmth Glow · 5 colors

Glow #370EB4 Secondary #E86A71 Accent #F6934E Anchor #583B57 Surface #F7E7D7

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

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Color Lab

How #370EB4 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 17/100

Cool

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

Softness 23/100

Low

Firm and assertive — carries weight and contrast.

Depth 67/100

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 14/100

Very low

Clean and current — no dusty, aged cast.

Luxury 59/100

Moderate

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

Brand distinctiveness 86/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 52/100

Moderate

Workable accent with care around contrast.

Surface fit 15/100

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 #370EB4

For UI

For branding

For interior

For fashion

People also use #370EB4 with

Cerulean Mauveine Greenery Gainsboro Russian Violet

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 11.1:1. Use

Subtle surface Use #D6CCF3 for cards and hover fills. Tint 80

Avoid beside #6F0EB4 — 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 #370EB4 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: #370EB4;
  --color-base-rgb: 55 14 180;
  --color-base-oklch: oklch(38.1% 0.223 278.5);
  --color-50: #F4F0FE;
  --color-100: #E1D8FD;
  --color-200: #C5B3F9;
  --color-300: #9C80EF;
  --color-400: #7552E0;
  --color-500: #552FC6;
  --color-600: #462B96;
  --color-700: #36256A;
  --color-800: #261C45;
  --color-900: #19132A;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  egyptian-blue: {
    50: '#F4F0FE',
    100: '#E1D8FD',
    200: '#C5B3F9',
    300: '#9C80EF',
    400: '#7552E0',
    500: '#552FC6',
    600: '#462B96',
    700: '#36256A',
    800: '#261C45',
    900: '#19132A',
  },
}

$base: #370EB4;
$base-ink: #FFFFFF;
$base-50: #F4F0FE;
$base-100: #E1D8FD;
$base-200: #C5B3F9;
$base-300: #9C80EF;
$base-400: #7552E0;
$base-500: #552FC6;
$base-600: #462B96;
$base-700: #36256A;
$base-800: #261C45;
$base-900: #19132A;
$base-hover: #2C0B90;
$base-subtle: #C0B1EF;

{
    "color": {
        "base": {
            "value": "#370EB4",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F0FE",
                "type": "color"
            },
            "100": {
                "value": "#E1D8FD",
                "type": "color"
            },
            "200": {
                "value": "#C5B3F9",
                "type": "color"
            },
            "300": {
                "value": "#9C80EF",
                "type": "color"
            },
            "400": {
                "value": "#7552E0",
                "type": "color"
            },
            "500": {
                "value": "#552FC6",
                "type": "color"
            },
            "600": {
                "value": "#462B96",
                "type": "color"
            },
            "700": {
                "value": "#36256A",
                "type": "color"
            },
            "800": {
                "value": "#261C45",
                "type": "color"
            },
            "900": {
                "value": "#19132A",
                "type": "color"
            }
        }
    }
}

Palettes built on #370EB4

Color Lab

Pairs with #370EB4

UI roles & guardrails

In real applications

Scales

Every model

Export