What color is #0331D5?

#0331D5 is a medium, vivid blue. In RGB it is rgb(3, 49, 213), and in HSL hsl(227, 97%, 42%).

Is #0331D5 accessible as text?

On white, #0331D5 has a contrast ratio of 8.74:1 (passes WCAG AA for body text); on black it is 2.40:1 (fails). For text placed on #0331D5, use white for the best readability.

What is the closest Tailwind color to #0331D5?

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

What colors go well with #0331D5?

#0331D5 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #D3A603. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #0331D5 below.

Is #0331D5 good for buttons?

#0331D5 works well for buttons and highlights, but use white text on #0331D5 — black text only reaches 2.40:1, below the 4.5:1 needed for normal-size labels.

Is #0331D5 the same as CSS mediumblue?

No — #0331D5 is not the CSS named color mediumblue, but mediumblue (#0000CD) is the closest CSS named color.

#0331D5 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #0331D5

Not just a swatch — here's how #0331D5 works with other colors. Named schemes with #0331D5 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #0331D5 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #2C63F2

Medium 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 Medium Blue.

Coastal Morning Lead · 5 colors

Lead #0331D5 Accent #A5C4C2 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

Medium Blue 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 #0331D5 Surface #F6E5D8 Anchor #5B2144 Accent #E5C2CA Secondary #322B2F

Medium 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 #0331D5 Secondary #5F78AC Support #9D8F88 Ink #18140F

Medium 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 Medium Blue carrying the quiet middle.

Sunset Warmth Glow · 5 colors

Glow #0331D5 Secondary #E76A75 Accent #F79251 Anchor #573B58 Surface #F7E7D7

Medium 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 #0331D5 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 24/100

Low

Firm and assertive — carries weight and contrast.

Depth 63/100

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 8/100

Very low

Clean and current — no dusty, aged cast.

Luxury 53/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 95/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 54/100

Moderate

Workable accent with care around contrast.

Surface fit 12/100

Very low

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

Print safety 54/100

Moderate

Prints close, with a slight loss of vibrancy.

Pairs with #0331D5

For UI

For branding

For interior

For fashion

People also use #0331D5 with

Deep Sky Blue Han Purple Dijon Gainsboro Gunmetal Gray

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 8.7:1. Use

Subtle surface Use #CDD6F6 for cards and hover fills. Tint 80

Avoid beside #1B03D3 — 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 #0331D5 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: #0331D5;
  --color-base-rgb: 3 49 213;
  --color-base-oklch: oklch(43.4% 0.247 264.2);
  --color-50: #F0F3FE;
  --color-100: #D8E0FD;
  --color-200: #B1C1FC;
  --color-300: #7994F6;
  --color-400: #496CE9;
  --color-500: #254AD0;
  --color-600: #253F9D;
  --color-700: #20316F;
  --color-800: #192348;
  --color-900: #11172C;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  medium-blue: {
    50: '#F0F3FE',
    100: '#D8E0FD',
    200: '#B1C1FC',
    300: '#7994F6',
    400: '#496CE9',
    500: '#254AD0',
    600: '#253F9D',
    700: '#20316F',
    800: '#192348',
    900: '#11172C',
  },
}

$base: #0331D5;
$base-ink: #FFFFFF;
$base-50: #F0F3FE;
$base-100: #D8E0FD;
$base-200: #B1C1FC;
$base-300: #7994F6;
$base-400: #496CE9;
$base-500: #254AD0;
$base-600: #253F9D;
$base-700: #20316F;
$base-800: #192348;
$base-900: #11172C;
$base-hover: #0327A9;
$base-subtle: #B2C0F3;

{
    "color": {
        "base": {
            "value": "#0331D5",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F3FE",
                "type": "color"
            },
            "100": {
                "value": "#D8E0FD",
                "type": "color"
            },
            "200": {
                "value": "#B1C1FC",
                "type": "color"
            },
            "300": {
                "value": "#7994F6",
                "type": "color"
            },
            "400": {
                "value": "#496CE9",
                "type": "color"
            },
            "500": {
                "value": "#254AD0",
                "type": "color"
            },
            "600": {
                "value": "#253F9D",
                "type": "color"
            },
            "700": {
                "value": "#20316F",
                "type": "color"
            },
            "800": {
                "value": "#192348",
                "type": "color"
            },
            "900": {
                "value": "#11172C",
                "type": "color"
            }
        }
    }
}

Palettes built on #0331D5

Color Lab

Pairs with #0331D5

UI roles & guardrails

In real applications

Scales

Every model

Export