What color is #434FBC?

#434FBC is a medium blue-violet. In RGB it is rgb(67, 79, 188), and in HSL hsl(234, 47%, 50%).

Is #434FBC accessible as text?

On white, #434FBC has a contrast ratio of 6.81:1 (passes WCAG AA for body text); on black it is 3.08:1 (fails). For text placed on #434FBC, use white for the best readability.

What is the closest Tailwind color to #434FBC?

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

What colors go well with #434FBC?

#434FBC pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #BBAF44. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #434FBC below.

Is #434FBC good for buttons?

#434FBC works well for buttons and highlights, but use white text on #434FBC — black text only reaches 3.08:1, below the 4.5:1 needed for normal-size labels.

Is #434FBC the same as CSS slateblue?

No — #434FBC is not the CSS named color slateblue, but slateblue (#6A5ACD) is the closest CSS named color.

#434FBC Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #434FBC

Not just a swatch — here's how #434FBC works with other colors. Named schemes with #434FBC in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #434FBC Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

Cerulean opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.

Tech Product Signal · 5 colors

Signal #434FBC Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #6577DB

Cerulean is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Cerulean.

Vintage Leather Lead · 5 colors

Lead #434FBC Secondary #7F4535 Surface #EED7C2 Accent #365247 Anchor #582239

Cerulean plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.

Berry & Cream Lead · 5 colors

Lead #434FBC Surface #F6E5D8 Anchor #5B2143 Accent #E5C2C9 Secondary #322B2F

Cerulean 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 #434FBC Secondary #7B85AB Support #9D8F88 Ink #18140F

Cerulean 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 Cerulean carrying the quiet middle.

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Color Lab

How #434FBC 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 14/100

Cool

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

Softness 34/100

Low

Middle-weight — neither delicate nor heavy.

Depth 54/100

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 33/100

Low

A faint retro warmth without tipping into sepia.

Luxury 55/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 46/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 93/100

Very high

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

Surface fit 9/100

Very low

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

Print safety 72/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #434FBC

For UI

For branding

For interior

For fashion

People also use #434FBC with

Iceberg Royal Purple Brass Gainsboro Prussian Blue

UI roles & guardrails

Primary action Safe as a filled button with white label. AA

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 6.8:1. Use

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

Avoid beside #6044BB — 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 #434FBC 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: #434FBC;
  --color-base-rgb: 67 79 188;
  --color-base-oklch: oklch(48.2% 0.170 273.4);
  --color-50: #F3F4FB;
  --color-100: #E0E2F5;
  --color-200: #C3C7E9;
  --color-300: #999FD6;
  --color-400: #727AC0;
  --color-500: #5159A4;
  --color-600: #44497E;
  --color-700: #34385A;
  --color-800: #25273C;
  --color-900: #181A25;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  cerulean: {
    50: '#F3F4FB',
    100: '#E0E2F5',
    200: '#C3C7E9',
    300: '#999FD6',
    400: '#727AC0',
    500: '#5159A4',
    600: '#44497E',
    700: '#34385A',
    800: '#25273C',
    900: '#181A25',
  },
}

$base: #434FBC;
$base-ink: #FFFFFF;
$base-50: #F3F4FB;
$base-100: #E0E2F5;
$base-200: #C3C7E9;
$base-300: #999FD6;
$base-400: #727AC0;
$base-500: #5159A4;
$base-600: #44497E;
$base-700: #34385A;
$base-800: #25273C;
$base-900: #181A25;
$base-hover: #364096;
$base-subtle: #CBCEE6;

{
    "color": {
        "base": {
            "value": "#434FBC",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F4FB",
                "type": "color"
            },
            "100": {
                "value": "#E0E2F5",
                "type": "color"
            },
            "200": {
                "value": "#C3C7E9",
                "type": "color"
            },
            "300": {
                "value": "#999FD6",
                "type": "color"
            },
            "400": {
                "value": "#727AC0",
                "type": "color"
            },
            "500": {
                "value": "#5159A4",
                "type": "color"
            },
            "600": {
                "value": "#44497E",
                "type": "color"
            },
            "700": {
                "value": "#34385A",
                "type": "color"
            },
            "800": {
                "value": "#25273C",
                "type": "color"
            },
            "900": {
                "value": "#181A25",
                "type": "color"
            }
        }
    }
}

Palettes built on #434FBC

Color Lab

Pairs with #434FBC

UI roles & guardrails

In real applications

Scales

Every model

Export