What color is #604EB6?

#604EB6 is a medium indigo. In RGB it is rgb(96, 78, 182), and in HSL hsl(250, 42%, 51%).

Is #604EB6 accessible as text?

On white, #604EB6 has a contrast ratio of 6.44:1 (passes WCAG AA for body text); on black it is 3.26:1 (fails). For text placed on #604EB6, use white for the best readability.

What is the closest Tailwind color to #604EB6?

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

What colors go well with #604EB6?

#604EB6 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #A5B74E. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #604EB6 below.

Is #604EB6 good for buttons?

#604EB6 works well for buttons and highlights, but use white text on #604EB6 — black text only reaches 3.26:1, below the 4.5:1 needed for normal-size labels.

Is #604EB6 the same as CSS slateblue?

No — #604EB6 is not the CSS named color slateblue, but slateblue (#6A5ACD) is the closest CSS named color.

#604EB6 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #604EB6

Not just a swatch — here's how #604EB6 works with other colors. Named schemes with #604EB6 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #604EB6 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 #604EB6 Secondary #7E4633 Surface #EDD8C2 Accent #365247 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 #604EB6 Anchor #3B2923 Surface #F3E1D2 Accent #759F7C 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 #604EB6 Surface #F5E5D7 Anchor #5B2141 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 #604EB6 Secondary #8987AC 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.

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Color Lab

How #604EB6 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 25/100

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 40/100

Low

A faint retro warmth without tipping into sepia.

Luxury 54/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 43/100

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 78/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #604EB6

For UI

For branding

For interior

For fashion

People also use #604EB6 with

Ocean Blue Amethyst Pistachio 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 6.4:1. Use

Subtle surface Use #E1DEEE for cards and hover fills. Tint 80

Avoid beside #824EB7 — 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 #604EB6 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: #604EB6;
  --color-base-rgb: 96 78 182;
  --color-base-oklch: oklch(49.8% 0.158 287.2);
  --color-50: #F5F4FB;
  --color-100: #E5E2F4;
  --color-200: #CBC5E7;
  --color-300: #A69CD3;
  --color-400: #8276BC;
  --color-500: #62559F;
  --color-600: #4F477B;
  --color-700: #3C3658;
  --color-800: #2A263B;
  --color-900: #1B1924;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  tanzanite: {
    50: '#F5F4FB',
    100: '#E5E2F4',
    200: '#CBC5E7',
    300: '#A69CD3',
    400: '#8276BC',
    500: '#62559F',
    600: '#4F477B',
    700: '#3C3658',
    800: '#2A263B',
    900: '#1B1924',
  },
}

$base: #604EB6;
$base-ink: #FFFFFF;
$base-50: #F5F4FB;
$base-100: #E5E2F4;
$base-200: #CBC5E7;
$base-300: #A69CD3;
$base-400: #8276BC;
$base-500: #62559F;
$base-600: #4F477B;
$base-700: #3C3658;
$base-800: #2A263B;
$base-900: #1B1924;
$base-hover: #4B3C94;
$base-subtle: #D2CEE5;

{
    "color": {
        "base": {
            "value": "#604EB6",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F4FB",
                "type": "color"
            },
            "100": {
                "value": "#E5E2F4",
                "type": "color"
            },
            "200": {
                "value": "#CBC5E7",
                "type": "color"
            },
            "300": {
                "value": "#A69CD3",
                "type": "color"
            },
            "400": {
                "value": "#8276BC",
                "type": "color"
            },
            "500": {
                "value": "#62559F",
                "type": "color"
            },
            "600": {
                "value": "#4F477B",
                "type": "color"
            },
            "700": {
                "value": "#3C3658",
                "type": "color"
            },
            "800": {
                "value": "#2A263B",
                "type": "color"
            },
            "900": {
                "value": "#1B1924",
                "type": "color"
            }
        }
    }
}

Palettes built on #604EB6

Color Lab

Pairs with #604EB6

UI roles & guardrails

In real applications

Scales

Every model

Export