What color is #372FDD?

#372FDD is a medium, vivid blue-violet. In RGB it is rgb(55, 47, 221), and in HSL hsl(243, 72%, 53%).

Is #372FDD accessible as text?

On white, #372FDD has a contrast ratio of 8.04:1 (passes WCAG AA for body text); on black it is 2.61:1 (fails). For text placed on #372FDD, use white for the best readability.

What is the closest Tailwind color to #372FDD?

The nearest Tailwind CSS token is indigo-700 (#432DD7).

What colors go well with #372FDD?

#372FDD pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #D5DD31. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #372FDD below.

Is #372FDD good for buttons?

#372FDD works well for buttons and highlights, but use white text on #372FDD — black text only reaches 2.61:1, below the 4.5:1 needed for normal-size labels.

Is #372FDD the same as CSS blue?

No — #372FDD is not the CSS named color blue, but blue (#0000FF) is the closest CSS named color.

#372FDD Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #372FDD

Not just a swatch — here's how #372FDD works with other colors. Named schemes with #372FDD in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #372FDD Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #5363FA

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

Coastal Morning Lead · 5 colors

Lead #372FDD Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

Ultramarine 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 #372FDD Surface #F6E5D8 Anchor #5B2143 Accent #E5C2C9 Secondary #322B2F

Ultramarine 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 #372FDD Secondary #6E7CB3 Support #9D8F88 Ink #18140F

Ultramarine 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 Ultramarine carrying the quiet middle.

Sunset Warmth Glow · 5 colors

Glow #372FDD Secondary #E86A73 Accent #F6924F Anchor #573B58 Surface #F7E7D7

Ultramarine 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 #372FDD 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 13/100

Cool

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

Softness 25/100

Low

Firm and assertive — carries weight and contrast.

Depth 60/100

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 8/100

Very low

Clean and current — no dusty, aged cast.

Luxury 51/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 96/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 57/100

Moderate

Workable accent with care around contrast.

Surface fit 10/100

Very low

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

Print safety 59/100

Moderate

Prints close, with a slight loss of vibrancy.

Pairs with #372FDD

For UI

For branding

For interior

For fashion

People also use #372FDD with

Carolina Blue Dark Orchid Pear Gainsboro Prussian Blue

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 8.0:1. Use

Subtle surface Use #DCDBF3 for cards and hover fills. Tint 80

Avoid beside #7331DD — 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 #372FDD 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: #372FDD;
  --color-base-rgb: 55 47 221;
  --color-base-oklch: oklch(45.7% 0.248 272.7);
  --color-50: #F2F1FD;
  --color-100: #DDDBFA;
  --color-200: #BCB9F3;
  --color-300: #8E89E6;
  --color-400: #635DD5;
  --color-500: #413BBA;
  --color-600: #39348E;
  --color-700: #2D2A64;
  --color-800: #211F42;
  --color-900: #161528;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  ultramarine: {
    50: '#F2F1FD',
    100: '#DDDBFA',
    200: '#BCB9F3',
    300: '#8E89E6',
    400: '#635DD5',
    500: '#413BBA',
    600: '#39348E',
    700: '#2D2A64',
    800: '#211F42',
    900: '#161528',
  },
}

$base: #372FDD;
$base-ink: #FFFFFF;
$base-50: #F2F1FD;
$base-100: #DDDBFA;
$base-200: #BCB9F3;
$base-300: #8E89E6;
$base-400: #635DD5;
$base-500: #413BBA;
$base-600: #39348E;
$base-700: #2D2A64;
$base-800: #211F42;
$base-900: #161528;
$base-hover: #261EBA;
$base-subtle: #C9C7EF;

{
    "color": {
        "base": {
            "value": "#372FDD",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F1FD",
                "type": "color"
            },
            "100": {
                "value": "#DDDBFA",
                "type": "color"
            },
            "200": {
                "value": "#BCB9F3",
                "type": "color"
            },
            "300": {
                "value": "#8E89E6",
                "type": "color"
            },
            "400": {
                "value": "#635DD5",
                "type": "color"
            },
            "500": {
                "value": "#413BBA",
                "type": "color"
            },
            "600": {
                "value": "#39348E",
                "type": "color"
            },
            "700": {
                "value": "#2D2A64",
                "type": "color"
            },
            "800": {
                "value": "#211F42",
                "type": "color"
            },
            "900": {
                "value": "#161528",
                "type": "color"
            }
        }
    }
}

Palettes built on #372FDD

Color Lab

Pairs with #372FDD

UI roles & guardrails

In real applications

Scales

Every model

Export