What color is #4151C8?

#4151C8 is a medium blue. In RGB it is rgb(65, 81, 200), and in HSL hsl(233, 55%, 52%).

Is #4151C8 accessible as text?

On white, #4151C8 has a contrast ratio of 6.49:1 (passes WCAG AA for body text); on black it is 3.24:1 (fails). For text placed on #4151C8, use white for the best readability.

What is the closest Tailwind color to #4151C8?

The nearest Tailwind CSS token is blue-700 (#1447E6).

What colors go well with #4151C8?

#4151C8 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #C8B841. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #4151C8 below.

Is #4151C8 good for buttons?

#4151C8 works well for buttons and highlights, but use white text on #4151C8 — black text only reaches 3.24:1, below the 4.5:1 needed for normal-size labels.

Is #4151C8 the same as CSS slateblue?

No — #4151C8 is not the CSS named color slateblue, but slateblue (#6A5ACD) is the closest CSS named color.

#4151C8 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #4151C8

Not just a swatch — here's how #4151C8 works with other colors. Named schemes with #4151C8 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #4151C8 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 #4151C8 Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #637AE7

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 #4151C8 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 #4151C8 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 #4151C8 Secondary #7D89B2 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.

Build a working theme in the generator →

Color Lab

How #4151C8 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 33/100

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 29/100

Low

A faint retro warmth without tipping into sepia.

Luxury 53/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 50/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 91/100

Very high

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

Surface fit 8/100

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 #4151C8

For UI

For branding

For interior

For fashion

People also use #4151C8 with

Iceberg Blue Violet Dark Khaki 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 6.5:1. Use

Subtle surface Use #DDDFF0 for cards and hover fills. Tint 80

Avoid beside #5E41C8 — 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 #4151C8 at work across the surfaces designers actually ship.

Website / UI

Northwind Sign up

Build faster.

A working theme, generated in seconds.

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: #4151C8;
  --color-base-rgb: 65 81 200;
  --color-base-oklch: oklch(49.5% 0.184 272.0);
  --color-50: #F3F4FC;
  --color-100: #DFE2F6;
  --color-200: #C0C5ED;
  --color-300: #949CDB;
  --color-400: #6B76C7;
  --color-500: #4A55AB;
  --color-600: #3F4783;
  --color-700: #31365E;
  --color-800: #23263E;
  --color-900: #171926;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  cerulean: {
    50: '#F3F4FC',
    100: '#DFE2F6',
    200: '#C0C5ED',
    300: '#949CDB',
    400: '#6B76C7',
    500: '#4A55AB',
    600: '#3F4783',
    700: '#31365E',
    800: '#23263E',
    900: '#171926',
  },
}

$base: #4151C8;
$base-ink: #FFFFFF;
$base-50: #F3F4FC;
$base-100: #DFE2F6;
$base-200: #C0C5ED;
$base-300: #949CDB;
$base-400: #6B76C7;
$base-500: #4A55AB;
$base-600: #3F4783;
$base-700: #31365E;
$base-800: #23263E;
$base-900: #171926;
$base-hover: #303DA4;
$base-subtle: #CBCFEA;

{
    "color": {
        "base": {
            "value": "#4151C8",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F4FC",
                "type": "color"
            },
            "100": {
                "value": "#DFE2F6",
                "type": "color"
            },
            "200": {
                "value": "#C0C5ED",
                "type": "color"
            },
            "300": {
                "value": "#949CDB",
                "type": "color"
            },
            "400": {
                "value": "#6B76C7",
                "type": "color"
            },
            "500": {
                "value": "#4A55AB",
                "type": "color"
            },
            "600": {
                "value": "#3F4783",
                "type": "color"
            },
            "700": {
                "value": "#31365E",
                "type": "color"
            },
            "800": {
                "value": "#23263E",
                "type": "color"
            },
            "900": {
                "value": "#171926",
                "type": "color"
            }
        }
    }
}

Palettes built on #4151C8

Color Lab

Pairs with #4151C8

UI roles & guardrails

In real applications

Scales

Every model

Export