What color is #0645CD?

#0645CD is a medium, vivid blue. In RGB it is rgb(6, 69, 205), and in HSL hsl(221, 94%, 41%).

Is #0645CD accessible as text?

On white, #0645CD has a contrast ratio of 7.66:1 (passes WCAG AA for body text); on black it is 2.74:1 (fails). For text placed on #0645CD, use white for the best readability.

What is the closest Tailwind color to #0645CD?

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

What colors go well with #0645CD?

#0645CD pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #CB8D06. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #0645CD below.

Is #0645CD good for buttons?

#0645CD works well for buttons and highlights, but use white text on #0645CD — black text only reaches 2.74:1, below the 4.5:1 needed for normal-size labels.

Is #0645CD the same as CSS mediumblue?

No — #0645CD is not the CSS named color mediumblue, but mediumblue (#0000CD) is the closest CSS named color.

#0645CD Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #0645CD

Not just a swatch — here's how #0645CD works with other colors. Named schemes with #0645CD in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #0645CD Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #3670EB

Sapphire 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 Sapphire Blue.

Coastal Morning Lead · 5 colors

Lead #0645CD Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

Sapphire 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 #0645CD Surface #F6E5D8 Anchor #5A2144 Accent #E4C2CA Secondary #322B2F

Sapphire 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 #0645CD Secondary #677FAD Support #9D8F88 Ink #18140F

Sapphire 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 Sapphire Blue carrying the quiet middle.

Sunset Warmth Glow · 5 colors

Glow #0645CD Secondary #E76A75 Accent #F79151 Anchor #573B58 Surface #EEEBD6

Sapphire 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 #0645CD 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 8/100

Cool

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

Softness 28/100

Low

Firm and assertive — carries weight and contrast.

Depth 59/100

Moderate

Mid depth — usable as an accent or a muted ground.

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 17/100

Very low

Clean and current — no dusty, aged cast.

Luxury 53/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 84/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 72/100

High

Strong interactive accent — visible and can carry a legible label.

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 #0645CD

For UI

For branding

For interior

For fashion

People also use #0645CD with

Lagoon Blue Medium Blue Dark Goldenrod Gainsboro Charcoal

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 7.7:1. Use

Subtle surface Use #CDD9F5 for cards and hover fills. Tint 80

Avoid beside #0A06CB — 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 #0645CD 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: #0645CD;
  --color-base-rgb: 6 69 205;
  --color-base-oklch: oklch(45.7% 0.217 262.8);
  --color-50: #F0F5FE;
  --color-100: #D8E4FD;
  --color-200: #B1C8FC;
  --color-300: #7BA1F4;
  --color-400: #4B7CE7;
  --color-500: #285CCD;
  --color-600: #264B9B;
  --color-700: #21396D;
  --color-800: #1A2847;
  --color-900: #121A2B;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  sapphire-blue: {
    50: '#F0F5FE',
    100: '#D8E4FD',
    200: '#B1C8FC',
    300: '#7BA1F4',
    400: '#4B7CE7',
    500: '#285CCD',
    600: '#264B9B',
    700: '#21396D',
    800: '#1A2847',
    900: '#121A2B',
  },
}

$base: #0645CD;
$base-ink: #FFFFFF;
$base-50: #F0F5FE;
$base-100: #D8E4FD;
$base-200: #B1C8FC;
$base-300: #7BA1F4;
$base-400: #4B7CE7;
$base-500: #285CCD;
$base-600: #264B9B;
$base-700: #21396D;
$base-800: #1A2847;
$base-900: #121A2B;
$base-hover: #0537A2;
$base-subtle: #B2C6F2;

{
    "color": {
        "base": {
            "value": "#0645CD",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F5FE",
                "type": "color"
            },
            "100": {
                "value": "#D8E4FD",
                "type": "color"
            },
            "200": {
                "value": "#B1C8FC",
                "type": "color"
            },
            "300": {
                "value": "#7BA1F4",
                "type": "color"
            },
            "400": {
                "value": "#4B7CE7",
                "type": "color"
            },
            "500": {
                "value": "#285CCD",
                "type": "color"
            },
            "600": {
                "value": "#264B9B",
                "type": "color"
            },
            "700": {
                "value": "#21396D",
                "type": "color"
            },
            "800": {
                "value": "#1A2847",
                "type": "color"
            },
            "900": {
                "value": "#121A2B",
                "type": "color"
            }
        }
    }
}

Palettes built on #0645CD

Color Lab

Pairs with #0645CD

UI roles & guardrails

In real applications

Scales

Every model

Export