What color is #203FCB?

#203FCB is a medium, vivid blue. In RGB it is rgb(32, 63, 203), and in HSL hsl(229, 73%, 46%).

Is #203FCB accessible as text?

On white, #203FCB has a contrast ratio of 7.97:1 (passes WCAG AA for body text); on black it is 2.63:1 (fails). For text placed on #203FCB, use white for the best readability.

What is the closest Tailwind color to #203FCB?

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

What colors go well with #203FCB?

#203FCB pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #CBAC20. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #203FCB below.

Is #203FCB good for buttons?

#203FCB works well for buttons and highlights, but use white text on #203FCB — black text only reaches 2.63:1, below the 4.5:1 needed for normal-size labels.

Is #203FCB the same as CSS mediumblue?

No — #203FCB is not the CSS named color mediumblue, but mediumblue (#0000CD) is the closest CSS named color.

#203FCB Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #203FCB

Not just a swatch — here's how #203FCB works with other colors. Named schemes with #203FCB in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #203FCB Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #426BE9

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 #203FCB Accent #A5C4C2 Surface #EAD5C0 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 #203FCB Surface #F6E5D8 Anchor #5B2144 Accent #E5C2CA 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 #203FCB Secondary #697CAB 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 #203FCB Secondary #E86A74 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 #203FCB 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 10/100

Cool

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

Softness 27/100

Low

Firm and assertive — carries weight and contrast.

Depth 60/100

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 54/100

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 71/100

High

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

Surface fit 11/100

Very low

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

Print safety 61/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #203FCB

For UI

For branding

For interior

For fashion

People also use #203FCB with

Picton Blue Grape Goldenrod 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 8.0:1. Use

Subtle surface Use #D5DAF2 for cards and hover fills. Tint 80

Avoid beside #3920CB — 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 #203FCB 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: #203FCB;
  --color-base-rgb: 32 63 203;
  --color-base-oklch: oklch(45.1% 0.217 266.6);
  --color-50: #F1F3FD;
  --color-100: #DBE1FA;
  --color-200: #B9C3F4;
  --color-300: #889AE7;
  --color-400: #5D73D5;
  --color-500: #3A52BB;
  --color-600: #33448E;
  --color-700: #2A3565;
  --color-800: #1F2542;
  --color-900: #151828;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  sapphire-blue: {
    50: '#F1F3FD',
    100: '#DBE1FA',
    200: '#B9C3F4',
    300: '#889AE7',
    400: '#5D73D5',
    500: '#3A52BB',
    600: '#33448E',
    700: '#2A3565',
    800: '#1F2542',
    900: '#151828',
  },
}

$base: #203FCB;
$base-ink: #FFFFFF;
$base-50: #F1F3FD;
$base-100: #DBE1FA;
$base-200: #B9C3F4;
$base-300: #889AE7;
$base-400: #5D73D5;
$base-500: #3A52BB;
$base-600: #33448E;
$base-700: #2A3565;
$base-800: #1F2542;
$base-900: #151828;
$base-hover: #1932A2;
$base-subtle: #BFC7ED;

{
    "color": {
        "base": {
            "value": "#203FCB",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F3FD",
                "type": "color"
            },
            "100": {
                "value": "#DBE1FA",
                "type": "color"
            },
            "200": {
                "value": "#B9C3F4",
                "type": "color"
            },
            "300": {
                "value": "#889AE7",
                "type": "color"
            },
            "400": {
                "value": "#5D73D5",
                "type": "color"
            },
            "500": {
                "value": "#3A52BB",
                "type": "color"
            },
            "600": {
                "value": "#33448E",
                "type": "color"
            },
            "700": {
                "value": "#2A3565",
                "type": "color"
            },
            "800": {
                "value": "#1F2542",
                "type": "color"
            },
            "900": {
                "value": "#151828",
                "type": "color"
            }
        }
    }
}

Palettes built on #203FCB

Color Lab

Pairs with #203FCB

UI roles & guardrails

In real applications

Scales

Every model

Export