What color is #644EC6?

#644EC6 is a medium indigo. In RGB it is rgb(100, 78, 198), and in HSL hsl(251, 51%, 54%).

Is #644EC6 accessible as text?

On white, #644EC6 has a contrast ratio of 6.09:1 (passes WCAG AA for body text); on black it is 3.45:1 (fails). For text placed on #644EC6, use white for the best readability.

What is the closest Tailwind color to #644EC6?

The nearest Tailwind CSS token is indigo-700 (#432DD7).

What colors go well with #644EC6?

#644EC6 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #B0C64E. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #644EC6 below.

Is #644EC6 good for buttons?

#644EC6 works well for buttons and highlights, but use white text on #644EC6 — black text only reaches 3.45:1, below the 4.5:1 needed for normal-size labels.

Is #644EC6 the same as CSS slateblue?

No — #644EC6 is not the CSS named color slateblue, but slateblue (#6A5ACD) is the closest CSS named color.

#644EC6 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #644EC6

Not just a swatch — here's how #644EC6 works with other colors. Named schemes with #644EC6 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #644EC6 Accent #A5C4C3 Surface #E9D5BF Secondary #9AA0A1 Anchor #22334A

Slate 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 #644EC6 Secondary #7E4533 Surface #EDD8C2 Accent #365247 Anchor #582238

Slate 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 #644EC6 Anchor #3B2923 Surface #F3E1D2 Accent #759F7C Secondary #3C3734

Slate 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 #644EC6 Surface #F5E5D7 Anchor #5B2141 Accent #E5C2C8 Secondary #332B2F

Slate 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 #644EC6 Secondary #8D8BB5 Support #9D9088 Ink #18140F

Slate 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 Slate Blue carrying the quiet middle.

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Color Lab

How #644EC6 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 23/100

Cool

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

Softness 35/100

Low

Middle-weight — neither delicate nor heavy.

Depth 51/100

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 33/100

Low

A faint retro warmth without tipping into sepia.

Luxury 52/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 48/100

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 9/100

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 #644EC6

For UI

For branding

For interior

For fashion

People also use #644EC6 with

Carolina Blue Medium Orchid Yellow Green 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 6.1:1. Use

Subtle surface Use #E2DFF0 for cards and hover fills. Tint 80

Avoid beside #8C4EC6 — 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 #644EC6 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: #644EC6;
  --color-base-rgb: 100 78 198;
  --color-base-oklch: oklch(51.3% 0.179 286.7);
  --color-50: #F5F3FC;
  --color-100: #E4E0F6;
  --color-200: #C9C1EB;
  --color-300: #A397D9;
  --color-400: #7E6FC3;
  --color-500: #5E4EA7;
  --color-600: #4D4181;
  --color-700: #3A335C;
  --color-800: #29243D;
  --color-900: #1A1826;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  slate-blue: {
    50: '#F5F3FC',
    100: '#E4E0F6',
    200: '#C9C1EB',
    300: '#A397D9',
    400: '#7E6FC3',
    500: '#5E4EA7',
    600: '#4D4181',
    700: '#3A335C',
    800: '#29243D',
    900: '#1A1826',
  },
}

$base: #644EC6;
$base-ink: #FFFFFF;
$base-50: #F5F3FC;
$base-100: #E4E0F6;
$base-200: #C9C1EB;
$base-300: #A397D9;
$base-400: #7E6FC3;
$base-500: #5E4EA7;
$base-600: #4D4181;
$base-700: #3A335C;
$base-800: #29243D;
$base-900: #1A1826;
$base-hover: #4B36A6;
$base-subtle: #D3CEE9;

{
    "color": {
        "base": {
            "value": "#644EC6",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F3FC",
                "type": "color"
            },
            "100": {
                "value": "#E4E0F6",
                "type": "color"
            },
            "200": {
                "value": "#C9C1EB",
                "type": "color"
            },
            "300": {
                "value": "#A397D9",
                "type": "color"
            },
            "400": {
                "value": "#7E6FC3",
                "type": "color"
            },
            "500": {
                "value": "#5E4EA7",
                "type": "color"
            },
            "600": {
                "value": "#4D4181",
                "type": "color"
            },
            "700": {
                "value": "#3A335C",
                "type": "color"
            },
            "800": {
                "value": "#29243D",
                "type": "color"
            },
            "900": {
                "value": "#1A1826",
                "type": "color"
            }
        }
    }
}

Palettes built on #644EC6

Color Lab

Pairs with #644EC6

UI roles & guardrails

In real applications

Scales

Every model

Export