What color is #333CB2?

#333CB2 is a medium blue-violet. In RGB it is rgb(51, 60, 178), and in HSL hsl(236, 55%, 45%).

Is #333CB2 accessible as text?

On white, #333CB2 has a contrast ratio of 8.64:1 (passes WCAG AA for body text); on black it is 2.43:1 (fails). For text placed on #333CB2, use white for the best readability.

What is the closest Tailwind color to #333CB2?

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

What colors go well with #333CB2?

#333CB2 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #B2A934. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #333CB2 below.

Is #333CB2 good for buttons?

#333CB2 works well for buttons and highlights, but use white text on #333CB2 — black text only reaches 2.43:1, below the 4.5:1 needed for normal-size labels.

Is #333CB2 the same as CSS darkslateblue?

No — #333CB2 is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#333CB2 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #333CB2

Not just a swatch — here's how #333CB2 works with other colors. Named schemes with #333CB2 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #333CB2 Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

Cobalt Blue 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 #333CB2 Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #5365D1

Cobalt 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 Cobalt Blue.

Vintage Leather Lead · 5 colors

Lead #333CB2 Secondary #7F4535 Surface #EED7C2 Accent #365247 Anchor #582239

Cobalt Blue 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 #333CB2 Surface #F6E5D8 Anchor #5B2143 Accent #E5C2C9 Secondary #322B2F

Cobalt 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 #333CB2 Secondary #6A759E Support #9D8F88 Ink #18140F

Cobalt 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 Cobalt Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #333CB2 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 13/100

Cool

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

Softness 29/100

Low

Firm and assertive — carries weight and contrast.

Depth 60/100

High

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

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 26/100

Low

A faint retro warmth without tipping into sepia.

Luxury 58/100

Moderate

Restrained and premium — deep, quiet, high-end packaging and fashion.

Brand distinctiveness 50/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 78/100

High

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

Surface fit 12/100

Very low

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

Print safety 69/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #333CB2

For UI

For branding

For interior

For fashion

People also use #333CB2 with

Carolina Blue Grape Brass Gainsboro Prussian Blue

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 8.6:1. Use

Subtle surface Use #D8D9EE for cards and hover fills. Tint 80

Avoid beside #5534B2 — 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 #333CB2 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: #333CB2;
  --color-base-rgb: 51 60 178;
  --color-base-oklch: oklch(43.0% 0.184 272.4);
  --color-50: #F3F3FC;
  --color-100: #DFE0F6;
  --color-200: #C0C3ED;
  --color-300: #9499DB;
  --color-400: #6B72C7;
  --color-500: #4A50AB;
  --color-600: #3F4383;
  --color-700: #31345E;
  --color-800: #23253E;
  --color-900: #171826;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  cobalt-blue: {
    50: '#F3F3FC',
    100: '#DFE0F6',
    200: '#C0C3ED',
    300: '#9499DB',
    400: '#6B72C7',
    500: '#4A50AB',
    600: '#3F4383',
    700: '#31345E',
    800: '#23253E',
    900: '#171826',
  },
}

$base: #333CB2;
$base-ink: #FFFFFF;
$base-50: #F3F3FC;
$base-100: #DFE0F6;
$base-200: #C0C3ED;
$base-300: #9499DB;
$base-400: #6B72C7;
$base-500: #4A50AB;
$base-600: #3F4383;
$base-700: #31345E;
$base-800: #23253E;
$base-900: #171826;
$base-hover: #29308E;
$base-subtle: #C3C6E7;

{
    "color": {
        "base": {
            "value": "#333CB2",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F3FC",
                "type": "color"
            },
            "100": {
                "value": "#DFE0F6",
                "type": "color"
            },
            "200": {
                "value": "#C0C3ED",
                "type": "color"
            },
            "300": {
                "value": "#9499DB",
                "type": "color"
            },
            "400": {
                "value": "#6B72C7",
                "type": "color"
            },
            "500": {
                "value": "#4A50AB",
                "type": "color"
            },
            "600": {
                "value": "#3F4383",
                "type": "color"
            },
            "700": {
                "value": "#31345E",
                "type": "color"
            },
            "800": {
                "value": "#23253E",
                "type": "color"
            },
            "900": {
                "value": "#171826",
                "type": "color"
            }
        }
    }
}

Palettes built on #333CB2

Color Lab

Pairs with #333CB2

UI roles & guardrails

In real applications

Scales

Every model

Export