What color is #644FAB?

#644FAB is a medium indigo. In RGB it is rgb(100, 79, 171), and in HSL hsl(254, 37%, 49%).

Is #644FAB accessible as text?

On white, #644FAB has a contrast ratio of 6.46:1 (passes WCAG AA for body text); on black it is 3.25:1 (fails). For text placed on #644FAB, use white for the best readability.

What is the closest Tailwind color to #644FAB?

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

What colors go well with #644FAB?

#644FAB pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #96AB4F. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #644FAB below.

Is #644FAB good for buttons?

#644FAB works well for buttons and highlights, but use white text on #644FAB — black text only reaches 3.25:1, below the 4.5:1 needed for normal-size labels.

Is #644FAB the same as CSS slateblue?

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

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

Palettes built on #644FAB

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

Berry & Cream Lead · 5 colors

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

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

Coastal Morning Lead · 5 colors

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

Tanzanite 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 #644FAB Secondary #7E4633 Surface #EDD8C2 Accent #355248 Anchor #582237

Tanzanite 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 #644FAB Anchor #3B2923 Surface #F3E1D2 Accent #749F7D Secondary #3C3734

Tanzanite 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 #644FAB Secondary #8A86A7 Support #9D9088 Ink #18140F

Tanzanite 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 Tanzanite carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #644FAB 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 29/100

Cool

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

Softness 38/100

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 46/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 56/100

Moderate

Restrained and premium — deep, quiet, high-end packaging and fashion.

Brand distinctiveness 38/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 98/100

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 81/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #644FAB

For UI

For branding

For interior

For fashion

People also use #644FAB with

Glaucous Royal Purple 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 #E1DEEC for cards and hover fills. Tint 80

Avoid beside #834FAB — 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 #644FAB 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: #644FAB;
  --color-base-rgb: 100 79 171;
  --color-base-oklch: oklch(49.5% 0.142 290.8);
  --color-50: #F6F4FA;
  --color-100: #E6E3F3;
  --color-200: #CEC7E5;
  --color-300: #ABA0CF;
  --color-400: #897AB8;
  --color-500: #695A9B;
  --color-600: #554A78;
  --color-700: #3F3856;
  --color-800: #2C2839;
  --color-900: #1C1A24;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  tanzanite: {
    50: '#F6F4FA',
    100: '#E6E3F3',
    200: '#CEC7E5',
    300: '#ABA0CF',
    400: '#897AB8',
    500: '#695A9B',
    600: '#554A78',
    700: '#3F3856',
    800: '#2C2839',
    900: '#1C1A24',
  },
}

$base: #644FAB;
$base-ink: #FFFFFF;
$base-50: #F6F4FA;
$base-100: #E6E3F3;
$base-200: #CEC7E5;
$base-300: #ABA0CF;
$base-400: #897AB8;
$base-500: #695A9B;
$base-600: #554A78;
$base-700: #3F3856;
$base-800: #2C2839;
$base-900: #1C1A24;
$base-hover: #503F89;
$base-subtle: #D2CDE3;

{
    "color": {
        "base": {
            "value": "#644FAB",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F6F4FA",
                "type": "color"
            },
            "100": {
                "value": "#E6E3F3",
                "type": "color"
            },
            "200": {
                "value": "#CEC7E5",
                "type": "color"
            },
            "300": {
                "value": "#ABA0CF",
                "type": "color"
            },
            "400": {
                "value": "#897AB8",
                "type": "color"
            },
            "500": {
                "value": "#695A9B",
                "type": "color"
            },
            "600": {
                "value": "#554A78",
                "type": "color"
            },
            "700": {
                "value": "#3F3856",
                "type": "color"
            },
            "800": {
                "value": "#2C2839",
                "type": "color"
            },
            "900": {
                "value": "#1C1A24",
                "type": "color"
            }
        }
    }
}

Palettes built on #644FAB

Color Lab

Pairs with #644FAB

UI roles & guardrails

In real applications

Scales

Every model

Export