What color is #6371CF?

#6371CF is a medium blue-violet. In RGB it is rgb(99, 113, 207), and in HSL hsl(232, 53%, 60%).

Is #6371CF accessible as text?

On white, #6371CF has a contrast ratio of 4.38:1 (fails WCAG AA for body text); on black it is 4.79:1 (passes). For text placed on #6371CF, use black for the best readability.

What is the closest Tailwind color to #6371CF?

The nearest Tailwind CSS token is sky-600 (#0084D1).

What colors go well with #6371CF?

#6371CF pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #CFC163. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #6371CF below.

Is #6371CF good for buttons?

#6371CF works well for buttons and highlights, but use black text on #6371CF — white text only reaches 4.38:1, below the 4.5:1 needed for normal-size labels.

Is #6371CF the same as CSS royalblue?

No — #6371CF is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#6371CF Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #6371CF

Not just a swatch — here's how #6371CF works with other colors. Named schemes with #6371CF in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #6371CF Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

Royal 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 #6371CF Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #8898EF

Royal 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 Royal Blue.

Vintage Leather Lead · 5 colors

Lead #6371CF Secondary #7F4535 Surface #EED7C2 Accent #365247 Anchor #582239

Royal 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 #6371CF Surface #F6E5D8 Anchor #5B2143 Accent #E5C2C9 Secondary #322B2F

Royal 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 #6371CF Secondary #9CA4C6 Support #9D9088 Ink #18140F

Royal 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 Royal Blue carrying the quiet middle.

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Color Lab

How #6371CF 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 20/100

Cool

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

Softness 44/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 43/100

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 44/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 48/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 39/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 95/100

Very high

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

Surface fit 17/100

Very low

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

Print safety 77/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #6371CF

For UI

For branding

For interior

For fashion

People also use #6371CF with

Sky Blue Amethyst Dark Khaki Gainsboro Prussian Blue

UI roles & guardrails

Primary action Too mid-tone for a filled button — darken for the fill. AA Large

Body text Do not use for body copy on light surfaces. Avoid

Large display Fine for headings 24px+ on white. Pass

Background Pair with white text at 4.4:1. Use

Subtle surface Use #E3E5F2 for cards and hover fills. Tint 80

Avoid beside #7963CF — 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 #6371CF 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: #6371CF;
  --color-base-rgb: 99 113 207;
  --color-base-oklch: oklch(58.3% 0.144 274.7);
  --color-50: #F3F4FC;
  --color-100: #DFE2F6;
  --color-200: #C1C6EC;
  --color-300: #959FDA;
  --color-400: #6D79C5;
  --color-500: #4C58A9;
  --color-600: #404982;
  --color-700: #32385D;
  --color-800: #24273D;
  --color-900: #171926;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  royal-blue: {
    50: '#F3F4FC',
    100: '#DFE2F6',
    200: '#C1C6EC',
    300: '#959FDA',
    400: '#6D79C5',
    500: '#4C58A9',
    600: '#404982',
    700: '#32385D',
    800: '#24273D',
    900: '#171926',
  },
}

$base: #6371CF;
$base-ink: #141310;
$base-50: #F3F4FC;
$base-100: #DFE2F6;
$base-200: #C1C6EC;
$base-300: #959FDA;
$base-400: #6D79C5;
$base-500: #4C58A9;
$base-600: #404982;
$base-700: #32385D;
$base-800: #24273D;
$base-900: #171926;
$base-hover: #3A4BBB;
$base-subtle: #D4D7ED;

{
    "color": {
        "base": {
            "value": "#6371CF",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F4FC",
                "type": "color"
            },
            "100": {
                "value": "#DFE2F6",
                "type": "color"
            },
            "200": {
                "value": "#C1C6EC",
                "type": "color"
            },
            "300": {
                "value": "#959FDA",
                "type": "color"
            },
            "400": {
                "value": "#6D79C5",
                "type": "color"
            },
            "500": {
                "value": "#4C58A9",
                "type": "color"
            },
            "600": {
                "value": "#404982",
                "type": "color"
            },
            "700": {
                "value": "#32385D",
                "type": "color"
            },
            "800": {
                "value": "#24273D",
                "type": "color"
            },
            "900": {
                "value": "#171926",
                "type": "color"
            }
        }
    }
}

Palettes built on #6371CF

Color Lab

Pairs with #6371CF

UI roles & guardrails

In real applications

Scales

Every model

Export