What color is #3318BB?

#3318BB is a medium, vivid indigo. In RGB it is rgb(51, 24, 187), and in HSL hsl(250, 77%, 41%).

Is #3318BB accessible as text?

On white, #3318BB has a contrast ratio of 10.56:1 (passes WCAG AA for body text); on black it is 1.99:1 (fails). For text placed on #3318BB, use white for the best readability.

What is the closest Tailwind color to #3318BB?

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

What colors go well with #3318BB?

#3318BB pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #9EB918. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #3318BB below.

Is #3318BB good for buttons?

#3318BB works well for buttons and highlights, but use white text on #3318BB — black text only reaches 1.99:1, below the 4.5:1 needed for normal-size labels.

Is #3318BB the same as CSS mediumblue?

No — #3318BB is not the CSS named color mediumblue, but mediumblue (#0000CD) is the closest CSS named color.

#3318BB Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #3318BB

Not just a swatch — here's how #3318BB works with other colors. Named schemes with #3318BB in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #3318BB Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #4D50D8

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 #3318BB Surface #F6E5D8 Anchor #5B2143 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 #3318BB Secondary #60699B 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 #3318BB Accent #A5C4C2 Surface #EAD5BF Secondary #9AA0A1 Anchor #21344A

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 #3318BB Secondary #E86A72 Accent #F6924E Anchor #573B57 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.

Build a working theme in the generator →

Color Lab

How #3318BB 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 15/100

Cool

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

Softness 23/100

Low

Firm and assertive — carries weight and contrast.

Depth 66/100

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 13/100

Very low

Clean and current — no dusty, aged cast.

Luxury 57/100

Moderate

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

Brand distinctiveness 88/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 53/100

Moderate

Workable accent with care around contrast.

Surface fit 14/100

Very low

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

Print safety 64/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #3318BB

For UI

For branding

For interior

For fashion

People also use #3318BB with

Royal Blue Dark Violet Apple Green 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 10.6:1. Use

Subtle surface Use #D6D0F2 for cards and hover fills. Tint 80

Avoid beside #6918B9 — 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 #3318BB 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: #3318BB;
  --color-base-rgb: 51 24 187;
  --color-base-oklch: oklch(39.3% 0.227 275.6);
  --color-50: #F3F1FE;
  --color-100: #E0DAFB;
  --color-200: #C1B7F5;
  --color-300: #9686E9;
  --color-400: #6F59D9;
  --color-500: #4D37BE;
  --color-600: #413191;
  --color-700: #332866;
  --color-800: #241E43;
  --color-900: #181429;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  egyptian-blue: {
    50: '#F3F1FE',
    100: '#E0DAFB',
    200: '#C1B7F5',
    300: '#9686E9',
    400: '#6F59D9',
    500: '#4D37BE',
    600: '#413191',
    700: '#332866',
    800: '#241E43',
    900: '#181429',
  },
}

$base: #3318BB;
$base-ink: #FFFFFF;
$base-50: #F3F1FE;
$base-100: #E0DAFB;
$base-200: #C1B7F5;
$base-300: #9686E9;
$base-400: #6F59D9;
$base-500: #4D37BE;
$base-600: #413191;
$base-700: #332866;
$base-800: #241E43;
$base-900: #181429;
$base-hover: #291394;
$base-subtle: #C0B7EC;

{
    "color": {
        "base": {
            "value": "#3318BB",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F1FE",
                "type": "color"
            },
            "100": {
                "value": "#E0DAFB",
                "type": "color"
            },
            "200": {
                "value": "#C1B7F5",
                "type": "color"
            },
            "300": {
                "value": "#9686E9",
                "type": "color"
            },
            "400": {
                "value": "#6F59D9",
                "type": "color"
            },
            "500": {
                "value": "#4D37BE",
                "type": "color"
            },
            "600": {
                "value": "#413191",
                "type": "color"
            },
            "700": {
                "value": "#332866",
                "type": "color"
            },
            "800": {
                "value": "#241E43",
                "type": "color"
            },
            "900": {
                "value": "#181429",
                "type": "color"
            }
        }
    }
}

Palettes built on #3318BB

Color Lab

Pairs with #3318BB

UI roles & guardrails

In real applications

Scales

Every model

Export