What color is #604EAB?

#604EAB is a medium indigo. In RGB it is rgb(96, 78, 171), and in HSL hsl(252, 37%, 49%).

Is #604EAB accessible as text?

On white, #604EAB has a contrast ratio of 6.61:1 (passes WCAG AA for body text); on black it is 3.18:1 (fails). For text placed on #604EAB, use white for the best readability.

What is the closest Tailwind color to #604EAB?

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

What colors go well with #604EAB?

#604EAB pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #99AB4F. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #604EAB below.

Is #604EAB good for buttons?

#604EAB works well for buttons and highlights, but use white text on #604EAB — black text only reaches 3.18:1, below the 4.5:1 needed for normal-size labels.

Is #604EAB the same as CSS slateblue?

No — #604EAB is not the CSS named color slateblue, but slateblue (#6A5ACD) is the closest CSS named color.

#604EAB Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #604EAB

Not just a swatch — here's how #604EAB works with other colors. Named schemes with #604EAB in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #604EAB 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 #604EAB Secondary #7E4633 Surface #EDD8C2 Accent #355248 Anchor #582238

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 #604EAB Anchor #3B2923 Surface #F3E1D2 Accent #749F7C 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.

Berry & Cream Lead · 5 colors

Lead #604EAB 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.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #604EAB Secondary #8885A6 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 #604EAB 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 28/100

Cool

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

Softness 37/100

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 45/100

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 39/100

Low

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 10/100

Very low

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

Print safety 80/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #604EAB

For UI

For branding

For interior

For fashion

People also use #604EAB with

Glaucous Royal Purple Greenery 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 6.6:1. Use

Subtle surface Use #E1DEEC for cards and hover fills. Tint 80

Avoid beside #804FAB — 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 #604EAB 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: #604EAB;
  --color-base-rgb: 96 78 171;
  --color-base-oklch: oklch(49.0% 0.143 288.9);
  --color-50: #F5F4FA;
  --color-100: #E6E3F3;
  --color-200: #CDC7E5;
  --color-300: #A9A0CF;
  --color-400: #877AB8;
  --color-500: #675A9B;
  --color-600: #534A78;
  --color-700: #3E3856;
  --color-800: #2B2839;
  --color-900: #1C1A24;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  tanzanite: {
    50: '#F5F4FA',
    100: '#E6E3F3',
    200: '#CDC7E5',
    300: '#A9A0CF',
    400: '#877AB8',
    500: '#675A9B',
    600: '#534A78',
    700: '#3E3856',
    800: '#2B2839',
    900: '#1C1A24',
  },
}

$base: #604EAB;
$base-ink: #FFFFFF;
$base-50: #F5F4FA;
$base-100: #E6E3F3;
$base-200: #CDC7E5;
$base-300: #A9A0CF;
$base-400: #877AB8;
$base-500: #675A9B;
$base-600: #534A78;
$base-700: #3E3856;
$base-800: #2B2839;
$base-900: #1C1A24;
$base-hover: #4E3F89;
$base-subtle: #D1CDE3;

{
    "color": {
        "base": {
            "value": "#604EAB",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F4FA",
                "type": "color"
            },
            "100": {
                "value": "#E6E3F3",
                "type": "color"
            },
            "200": {
                "value": "#CDC7E5",
                "type": "color"
            },
            "300": {
                "value": "#A9A0CF",
                "type": "color"
            },
            "400": {
                "value": "#877AB8",
                "type": "color"
            },
            "500": {
                "value": "#675A9B",
                "type": "color"
            },
            "600": {
                "value": "#534A78",
                "type": "color"
            },
            "700": {
                "value": "#3E3856",
                "type": "color"
            },
            "800": {
                "value": "#2B2839",
                "type": "color"
            },
            "900": {
                "value": "#1C1A24",
                "type": "color"
            }
        }
    }
}

Palettes built on #604EAB

Color Lab

Pairs with #604EAB

UI roles & guardrails

In real applications

Scales

Every model

Export