What color is #1045CB?

#1045CB is a medium, vivid blue. In RGB it is rgb(16, 69, 203), and in HSL hsl(223, 85%, 43%).

Is #1045CB accessible as text?

On white, #1045CB has a contrast ratio of 7.68:1 (passes WCAG AA for body text); on black it is 2.74:1 (fails). For text placed on #1045CB, use white for the best readability.

What is the closest Tailwind color to #1045CB?

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

What colors go well with #1045CB?

#1045CB pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #CB9610. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #1045CB below.

Is #1045CB good for buttons?

#1045CB works well for buttons and highlights, but use white text on #1045CB — black text only reaches 2.74:1, below the 4.5:1 needed for normal-size labels.

Is #1045CB the same as CSS mediumblue?

No — #1045CB is not the CSS named color mediumblue, but mediumblue (#0000CD) is the closest CSS named color.

#1045CB Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #1045CB

Not just a swatch — here's how #1045CB works with other colors. Named schemes with #1045CB in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #1045CB Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #3B70E9

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 #1045CB 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 #1045CB Surface #F6E5D8 Anchor #5B2144 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 #1045CB Secondary #687FAC 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 #1045CB Secondary #E76A75 Accent #F79251 Anchor #573B58 Surface #F7E7D7

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 #1045CB 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 18/100

Very low

Clean and current — no dusty, aged cast.

Luxury 54/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 82/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 74/100

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 60/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #1045CB

For UI

For branding

For interior

For fashion

People also use #1045CB with

Lagoon Blue Han Purple Dijon 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 #D0DAF4 for cards and hover fills. Tint 80

Avoid beside #1A10CB — 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 #1045CB 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: #1045CB;
  --color-base-rgb: 16 69 203;
  --color-base-oklch: oklch(45.7% 0.213 263.6);
  --color-50: #F0F4FE;
  --color-100: #D8E3FD;
  --color-200: #B4C7F9;
  --color-300: #81A0EE;
  --color-400: #537BDF;
  --color-500: #305AC5;
  --color-600: #2C4A96;
  --color-700: #25396A;
  --color-800: #1C2845;
  --color-900: #131A2A;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  sapphire-blue: {
    50: '#F0F4FE',
    100: '#D8E3FD',
    200: '#B4C7F9',
    300: '#81A0EE',
    400: '#537BDF',
    500: '#305AC5',
    600: '#2C4A96',
    700: '#25396A',
    800: '#1C2845',
    900: '#131A2A',
  },
}

$base: #1045CB;
$base-ink: #FFFFFF;
$base-50: #F0F4FE;
$base-100: #D8E3FD;
$base-200: #B4C7F9;
$base-300: #81A0EE;
$base-400: #537BDF;
$base-500: #305AC5;
$base-600: #2C4A96;
$base-700: #25396A;
$base-800: #1C2845;
$base-900: #131A2A;
$base-hover: #0D37A2;
$base-subtle: #B7C7F0;

{
    "color": {
        "base": {
            "value": "#1045CB",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F4FE",
                "type": "color"
            },
            "100": {
                "value": "#D8E3FD",
                "type": "color"
            },
            "200": {
                "value": "#B4C7F9",
                "type": "color"
            },
            "300": {
                "value": "#81A0EE",
                "type": "color"
            },
            "400": {
                "value": "#537BDF",
                "type": "color"
            },
            "500": {
                "value": "#305AC5",
                "type": "color"
            },
            "600": {
                "value": "#2C4A96",
                "type": "color"
            },
            "700": {
                "value": "#25396A",
                "type": "color"
            },
            "800": {
                "value": "#1C2845",
                "type": "color"
            },
            "900": {
                "value": "#131A2A",
                "type": "color"
            }
        }
    }
}

Palettes built on #1045CB

Color Lab

Pairs with #1045CB

UI roles & guardrails

In real applications

Scales

Every model

Export