What color is #4151EA?

#4151EA is a medium, vivid blue. In RGB it is rgb(65, 81, 234), and in HSL hsl(234, 80%, 59%).

Is #4151EA accessible as text?

On white, #4151EA has a contrast ratio of 5.85:1 (passes WCAG AA for body text); on black it is 3.59:1 (fails). For text placed on #4151EA, use white for the best readability.

What is the closest Tailwind color to #4151EA?

The nearest Tailwind CSS token is indigo-600 (#4F39F6).

What colors go well with #4151EA?

#4151EA pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #EAD943. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #4151EA below.

Is #4151EA good for buttons?

#4151EA works well for buttons and highlights, but use white text on #4151EA — black text only reaches 3.59:1, below the 4.5:1 needed for normal-size labels.

Is #4151EA the same as CSS royalblue?

No — #4151EA is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

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

Palettes built on #4151EA

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

Tech Product Signal · 5 colors

Signal #4151EA Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #637DFF

Neon 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 Neon Blue.

Coastal Morning Lead · 5 colors

Lead #4151EA Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

Neon 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 #4151EA Surface #F6E5D8 Anchor #5B2143 Accent #E5C2C9 Secondary #322B2F

Neon 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 #4151EA Secondary #8191C5 Support #9D8F88 Ink #18140F

Neon 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 Neon Blue carrying the quiet middle.

Sunset Warmth Glow · 5 colors

Glow #4151EA Secondary #E86A73 Accent #F6924F Anchor #573B58 Surface #F7E7D7

Neon 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 #4151EA 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 12/100

Cool

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

Softness 30/100

Low

Firm and assertive — carries weight and contrast.

Depth 52/100

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 16/100

Very low

Clean and current — no dusty, aged cast.

Luxury 47/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 88/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 73/100

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 62/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #4151EA

For UI

For branding

For interior

For fashion

People also use #4151EA with

Maya Blue Blue Violet Citrine 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 5.8:1. Use

Subtle surface Use #DEE0F6 for cards and hover fills. Tint 80

Avoid beside #6A43EA — 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 #4151EA 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: #4151EA;
  --color-base-rgb: 65 81 234;
  --color-base-oklch: oklch(52.4% 0.228 271.2);
  --color-50: #F1F2FE;
  --color-100: #D9DDFC;
  --color-200: #B6BCF7;
  --color-300: #848EEB;
  --color-400: #5764DB;
  --color-500: #3442C1;
  --color-600: #2F3993;
  --color-700: #272E68;
  --color-800: #1D2144;
  --color-900: #141629;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  neon-blue: {
    50: '#F1F2FE',
    100: '#D9DDFC',
    200: '#B6BCF7',
    300: '#848EEB',
    400: '#5764DB',
    500: '#3442C1',
    600: '#2F3993',
    700: '#272E68',
    800: '#1D2144',
    900: '#141629',
  },
}

$base: #4151EA;
$base-ink: #FFFFFF;
$base-50: #F1F2FE;
$base-100: #D9DDFC;
$base-200: #B6BCF7;
$base-300: #848EEB;
$base-400: #5764DB;
$base-500: #3442C1;
$base-600: #2F3993;
$base-700: #272E68;
$base-800: #1D2144;
$base-900: #141629;
$base-hover: #182BD9;
$base-subtle: #CDD0F3;

{
    "color": {
        "base": {
            "value": "#4151EA",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F2FE",
                "type": "color"
            },
            "100": {
                "value": "#D9DDFC",
                "type": "color"
            },
            "200": {
                "value": "#B6BCF7",
                "type": "color"
            },
            "300": {
                "value": "#848EEB",
                "type": "color"
            },
            "400": {
                "value": "#5764DB",
                "type": "color"
            },
            "500": {
                "value": "#3442C1",
                "type": "color"
            },
            "600": {
                "value": "#2F3993",
                "type": "color"
            },
            "700": {
                "value": "#272E68",
                "type": "color"
            },
            "800": {
                "value": "#1D2144",
                "type": "color"
            },
            "900": {
                "value": "#141629",
                "type": "color"
            }
        }
    }
}

Palettes built on #4151EA

Color Lab

Pairs with #4151EA

UI roles & guardrails

In real applications

Scales

Every model

Export