What color is #644FD7?

#644FD7 is a medium indigo. In RGB it is rgb(100, 79, 215), and in HSL hsl(249, 63%, 58%).

Is #644FD7 accessible as text?

On white, #644FD7 has a contrast ratio of 5.77:1 (passes WCAG AA for body text); on black it is 3.64:1 (fails). For text placed on #644FD7, use white for the best readability.

What is the closest Tailwind color to #644FD7?

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

What colors go well with #644FD7?

#644FD7 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #C3D750. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #644FD7 below.

Is #644FD7 good for buttons?

#644FD7 works well for buttons and highlights, but use white text on #644FD7 — black text only reaches 3.64:1, below the 4.5:1 needed for normal-size labels.

Is #644FD7 the same as CSS slateblue?

No — #644FD7 is not the CSS named color slateblue, but slateblue (#6A5ACD) is the closest CSS named color.

#644FD7 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #644FD7

Not just a swatch — here's how #644FD7 works with other colors. Named schemes with #644FD7 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #644FD7 Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #857AF6

Slate 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 Slate Blue.

Berry & Cream Lead · 5 colors

Lead #644FD7 Surface #F5E5D7 Anchor #5B2142 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 #644FD7 Secondary #8F8FBE 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.

Coastal Morning Lead · 5 colors

Lead #644FD7 Accent #A5C4C3 Surface #EAD5BF 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.

Sunset Warmth Glow · 5 colors

Glow #644FD7 Secondary #E86A70 Accent #F5934C Anchor #583B57 Surface #F7E7D7

Slate 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 #644FD7 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 21/100

Cool

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

Softness 34/100

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 27/100

Low

A faint retro warmth without tipping into sepia.

Luxury 49/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 77/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 87/100

Very 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 71/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #644FD7

For UI

For branding

For interior

For fashion

People also use #644FD7 with

Iceberg Medium Orchid Pear 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 #E3E0F3 for cards and hover fills. Tint 80

Avoid beside #9250D7 — 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 #644FD7 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: #644FD7;
  --color-base-rgb: 100 79 215;
  --color-base-oklch: oklch(52.8% 0.199 284.3);
  --color-50: #F4F2FD;
  --color-100: #E1DDF8;
  --color-200: #C4BDF0;
  --color-300: #9B8FE0;
  --color-400: #7465CD;
  --color-500: #5443B2;
  --color-600: #453A88;
  --color-700: #362E61;
  --color-800: #262140;
  --color-900: #191627;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  slate-blue: {
    50: '#F4F2FD',
    100: '#E1DDF8',
    200: '#C4BDF0',
    300: '#9B8FE0',
    400: '#7465CD',
    500: '#5443B2',
    600: '#453A88',
    700: '#362E61',
    800: '#262140',
    900: '#191627',
  },
}

$base: #644FD7;
$base-ink: #FFFFFF;
$base-50: #F4F2FD;
$base-100: #E1DDF8;
$base-200: #C4BDF0;
$base-300: #9B8FE0;
$base-400: #7465CD;
$base-500: #5443B2;
$base-600: #453A88;
$base-700: #362E61;
$base-800: #262140;
$base-900: #191627;
$base-hover: #422CC1;
$base-subtle: #D4CFEE;

{
    "color": {
        "base": {
            "value": "#644FD7",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F2FD",
                "type": "color"
            },
            "100": {
                "value": "#E1DDF8",
                "type": "color"
            },
            "200": {
                "value": "#C4BDF0",
                "type": "color"
            },
            "300": {
                "value": "#9B8FE0",
                "type": "color"
            },
            "400": {
                "value": "#7465CD",
                "type": "color"
            },
            "500": {
                "value": "#5443B2",
                "type": "color"
            },
            "600": {
                "value": "#453A88",
                "type": "color"
            },
            "700": {
                "value": "#362E61",
                "type": "color"
            },
            "800": {
                "value": "#262140",
                "type": "color"
            },
            "900": {
                "value": "#191627",
                "type": "color"
            }
        }
    }
}