What color is #644CB3?

#644CB3 is a medium indigo. In RGB it is rgb(100, 76, 179), and in HSL hsl(254, 40%, 50%).

Is #644CB3 accessible as text?

On white, #644CB3 has a contrast ratio of 6.51:1 (passes WCAG AA for body text); on black it is 3.23:1 (fails). For text placed on #644CB3, use white for the best readability.

What is the closest Tailwind color to #644CB3?

The nearest Tailwind CSS token is purple-800 (#6E11B0).

What colors go well with #644CB3?

#644CB3 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #9BB34D. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #644CB3 below.

Is #644CB3 good for buttons?

#644CB3 works well for buttons and highlights, but use white text on #644CB3 — black text only reaches 3.23:1, below the 4.5:1 needed for normal-size labels.

Is #644CB3 the same as CSS slateblue?

No — #644CB3 is not the CSS named color slateblue, but slateblue (#6A5ACD) is the closest CSS named color.

#644CB3 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #644CB3

Not just a swatch — here's how #644CB3 works with other colors. Named schemes with #644CB3 in its natural role, and a note on why the supporting colors balance it.

Berry & Cream Lead · 5 colors

Lead #644CB3 Surface #F5E5D7 Anchor #5C2141 Accent #E5C2C8 Secondary #332B2F

Royal Purple sits between cream and a deep berry here, softened by a blush accent and grounded by charcoal.

Coastal Morning Lead · 5 colors

Lead #644CB3 Accent #A5C4C3 Surface #E9D6BF Secondary #9AA0A1 Anchor #22334A

Royal Purple 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 #644CB3 Secondary #7E4633 Surface #EDD8C2 Accent #355248 Anchor #582237

Royal Purple 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 #644CB3 Anchor #3B2923 Surface #F3E1D2 Accent #749F7D Secondary #3C3734

Royal Purple 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.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #644CB3 Secondary #8A86AA Support #9D9088 Ink #18140F

Royal Purple 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 Purple carrying the quiet middle.

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Color Lab

How #644CB3 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 27/100

Cool

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

Softness 36/100

Low

Middle-weight — neither delicate nor heavy.

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 41/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 55/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 42/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 97/100

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 79/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #644CB3

For UI

For branding

For interior

For fashion

People also use #644CB3 with

Glaucous Amethyst Greenery Gainsboro Russian Violet

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 #E2DEED for cards and hover fills. Tint 80

Avoid beside #864DB3 — 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 #644CB3 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: #644CB3;
  --color-base-rgb: 100 76 179;
  --color-base-oklch: oklch(49.6% 0.157 290.2);
  --color-50: #F6F4FB;
  --color-100: #E6E2F3;
  --color-200: #CEC6E6;
  --color-300: #AA9ED1;
  --color-400: #8778BA;
  --color-500: #68579E;
  --color-600: #54487A;
  --color-700: #3F3758;
  --color-800: #2B273A;
  --color-900: #1C1924;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  royal-purple: {
    50: '#F6F4FB',
    100: '#E6E2F3',
    200: '#CEC6E6',
    300: '#AA9ED1',
    400: '#8778BA',
    500: '#68579E',
    600: '#54487A',
    700: '#3F3758',
    800: '#2B273A',
    900: '#1C1924',
  },
}

$base: #644CB3;
$base-ink: #FFFFFF;
$base-50: #F6F4FB;
$base-100: #E6E2F3;
$base-200: #CEC6E6;
$base-300: #AA9ED1;
$base-400: #8778BA;
$base-500: #68579E;
$base-600: #54487A;
$base-700: #3F3758;
$base-800: #2B273A;
$base-900: #1C1924;
$base-hover: #503D8F;
$base-subtle: #D3CDE4;

{
    "color": {
        "base": {
            "value": "#644CB3",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F6F4FB",
                "type": "color"
            },
            "100": {
                "value": "#E6E2F3",
                "type": "color"
            },
            "200": {
                "value": "#CEC6E6",
                "type": "color"
            },
            "300": {
                "value": "#AA9ED1",
                "type": "color"
            },
            "400": {
                "value": "#8778BA",
                "type": "color"
            },
            "500": {
                "value": "#68579E",
                "type": "color"
            },
            "600": {
                "value": "#54487A",
                "type": "color"
            },
            "700": {
                "value": "#3F3758",
                "type": "color"
            },
            "800": {
                "value": "#2B273A",
                "type": "color"
            },
            "900": {
                "value": "#1C1924",
                "type": "color"
            }
        }
    }
}

Palettes built on #644CB3

Color Lab

Pairs with #644CB3

UI roles & guardrails

In real applications

Scales

Every model

Export