What color is #646FD6?

#646FD6 is a light, soft blue-violet. In RGB it is rgb(100, 111, 214), and in HSL hsl(234, 58%, 62%).

Is #646FD6 accessible as text?

On white, #646FD6 has a contrast ratio of 4.39:1 (fails WCAG AA for body text); on black it is 4.79:1 (passes). For text placed on #646FD6, use black for the best readability.

What is the closest Tailwind color to #646FD6?

The nearest Tailwind CSS token is indigo-500 (#615FFF).

What colors go well with #646FD6?

#646FD6 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #D6CB66. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #646FD6 below.

Is #646FD6 good for buttons?

#646FD6 works well for buttons and highlights, but use black text on #646FD6 — white text only reaches 4.39:1, below the 4.5:1 needed for normal-size labels.

Is #646FD6 the same as CSS royalblue?

No — #646FD6 is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#646FD6 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #646FD6

Not just a swatch — here's how #646FD6 works with other colors. Named schemes with #646FD6 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #646FD6 Accent #A5C4C2 Surface #EAD5BF 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.

Vintage Leather Lead · 5 colors

Lead #646FD6 Secondary #7F4534 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.

Modern Café Dominant · 5 colors

Dominant #646FD6 Anchor #3B2923 Surface #F3E1D2 Accent #769F7B Secondary #3C3734

Royal Blue anchors this café scheme as the warm mid-tone, lifted by latte cream and a muted sage accent and grounded by espresso brown and a warm charcoal.

Berry & Cream Lead · 5 colors

Lead #646FD6 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 #646FD6 Secondary #9CA3C9 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 #646FD6 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 18/100

Cool

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

Softness 42/100

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 40/100

Low

A faint retro warmth without tipping into sepia.

Luxury 47/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 42/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 94/100

Very high

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

Surface fit 15/100

Very low

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

Print safety 75/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #646FD6

For UI

For branding

For interior

For fashion

People also use #646FD6 with

Sky Blue Amethyst Saffron 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 #E4E5F4 for cards and hover fills. Tint 80

Avoid beside #8066D6 — 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 #646FD6 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: #646FD6;
  --color-base-rgb: 100 111 214;
  --color-base-oklch: oklch(58.4% 0.156 275.9);
  --color-50: #F2F3FC;
  --color-100: #DEE1F7;
  --color-200: #BFC3EE;
  --color-300: #929ADD;
  --color-400: #6973C9;
  --color-500: #4752AD;
  --color-600: #3D4485;
  --color-700: #30355F;
  --color-800: #23253E;
  --color-900: #171826;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  royal-blue: {
    50: '#F2F3FC',
    100: '#DEE1F7',
    200: '#BFC3EE',
    300: '#929ADD',
    400: '#6973C9',
    500: '#4752AD',
    600: '#3D4485',
    700: '#30355F',
    800: '#23253E',
    900: '#171826',
  },
}

$base: #646FD6;
$base-ink: #141310;
$base-50: #F2F3FC;
$base-100: #DEE1F7;
$base-200: #BFC3EE;
$base-300: #929ADD;
$base-400: #6973C9;
$base-500: #4752AD;
$base-600: #3D4485;
$base-700: #30355F;
$base-800: #23253E;
$base-900: #171826;
$base-hover: #3544C8;
$base-subtle: #D5D8EF;

{
    "color": {
        "base": {
            "value": "#646FD6",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F3FC",
                "type": "color"
            },
            "100": {
                "value": "#DEE1F7",
                "type": "color"
            },
            "200": {
                "value": "#BFC3EE",
                "type": "color"
            },
            "300": {
                "value": "#929ADD",
                "type": "color"
            },
            "400": {
                "value": "#6973C9",
                "type": "color"
            },
            "500": {
                "value": "#4752AD",
                "type": "color"
            },
            "600": {
                "value": "#3D4485",
                "type": "color"
            },
            "700": {
                "value": "#30355F",
                "type": "color"
            },
            "800": {
                "value": "#23253E",
                "type": "color"
            },
            "900": {
                "value": "#171826",
                "type": "color"
            }
        }
    }
}

Palettes built on #646FD6

Color Lab

Pairs with #646FD6

UI roles & guardrails

In real applications

Scales

Every model

Export