What color is #370EA0?

#370EA0 is a dark, vivid indigo. In RGB it is rgb(55, 14, 160), and in HSL hsl(257, 84%, 34%).

Is #370EA0 accessible as text?

On white, #370EA0 has a contrast ratio of 12.12:1 (passes WCAG AA for body text); on black it is 1.73:1 (fails). For text placed on #370EA0, use white for the best readability.

What is the closest Tailwind color to #370EA0?

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

What colors go well with #370EA0?

#370EA0 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #76A00E. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #370EA0 below.

Is #370EA0 good for buttons?

#370EA0 works well for buttons and highlights, but use white text on #370EA0 — black text only reaches 1.73:1, below the 4.5:1 needed for normal-size labels.

Is #370EA0 the same as CSS indigo?

No — #370EA0 is not the CSS named color indigo, but indigo (#4B0082) is the closest CSS named color.

#370EA0 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #370EA0

Not just a swatch — here's how #370EA0 works with other colors. Named schemes with #370EA0 in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #370EA0 Anchor #141210 Accent #DB9758 Secondary #272833 Surface #F3ECE3

Klein Blue carries the depth in this luxury scheme, offset by a brass accent and near-black and held together by a deep neutral and an off-white surface.

Moody Editorial Color · 5 colors

Color #370EA0 Anchor #2A2A2E Secondary #6E6E74 Surface #EEE5DA Accent #2B0055

Klein Blue adds the colour to this moody editorial scheme — charcoal and a mid-grey around it, a bone highlight, and a muted jewel accent drawn from Klein Blue.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #370EA0 Secondary #5C5D8A Support #9D9088 Ink #18140F

Klein 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 Klein Blue carrying the quiet middle.

Coastal Morning Lead · 5 colors

Lead #370EA0 Accent #A5C4C3 Surface #EAD5BF Secondary #9AA0A1 Anchor #22334A

Klein 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 #370EA0 Secondary #E86A70 Accent #F5934D Anchor #583B57 Surface #F7E7D7

Klein 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 #370EA0 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 19/100

Cool

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

Softness 23/100

Low

Firm and assertive — carries weight and contrast.

Depth 69/100

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 19/100

Very low

Clean and current — no dusty, aged cast.

Luxury 62/100

High

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

Brand distinctiveness 78/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 51/100

Moderate

Workable accent with care around contrast.

Surface fit 17/100

Very low

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

Print safety 70/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #370EA0

For UI

For branding

For interior

For fashion

People also use #370EA0 with

Sapphire Blue Mauveine Olive Drab 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 12.1:1. Use

Subtle surface Use #D5C9F2 for cards and hover fills. Tint 80

Avoid beside #680EA0 — 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 #370EA0 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: #370EA0;
  --color-base-rgb: 55 14 160;
  --color-base-oklch: oklch(35.7% 0.202 281.7);
  --color-50: #F4F0FE;
  --color-100: #E3D8FD;
  --color-200: #C7B4F8;
  --color-300: #A081EE;
  --color-400: #7B53DF;
  --color-500: #5A30C4;
  --color-600: #4A2D95;
  --color-700: #392569;
  --color-800: #281C45;
  --color-900: #1A132A;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  klein-blue: {
    50: '#F4F0FE',
    100: '#E3D8FD',
    200: '#C7B4F8',
    300: '#A081EE',
    400: '#7B53DF',
    500: '#5A30C4',
    600: '#4A2D95',
    700: '#392569',
    800: '#281C45',
    900: '#1A132A',
  },
}

$base: #370EA0;
$base-ink: #FFFFFF;
$base-50: #F4F0FE;
$base-100: #E3D8FD;
$base-200: #C7B4F8;
$base-300: #A081EE;
$base-400: #7B53DF;
$base-500: #5A30C4;
$base-600: #4A2D95;
$base-700: #392569;
$base-800: #281C45;
$base-900: #1A132A;
$base-hover: #2C0B80;
$base-subtle: #BFACED;

{
    "color": {
        "base": {
            "value": "#370EA0",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F0FE",
                "type": "color"
            },
            "100": {
                "value": "#E3D8FD",
                "type": "color"
            },
            "200": {
                "value": "#C7B4F8",
                "type": "color"
            },
            "300": {
                "value": "#A081EE",
                "type": "color"
            },
            "400": {
                "value": "#7B53DF",
                "type": "color"
            },
            "500": {
                "value": "#5A30C4",
                "type": "color"
            },
            "600": {
                "value": "#4A2D95",
                "type": "color"
            },
            "700": {
                "value": "#392569",
                "type": "color"
            },
            "800": {
                "value": "#281C45",
                "type": "color"
            },
            "900": {
                "value": "#1A132A",
                "type": "color"
            }
        }
    }
}

Palettes built on #370EA0

Color Lab

Pairs with #370EA0

UI roles & guardrails

In real applications

Scales

Every model

Export