What color is #604CE3?

#604CE3 is a medium, vivid indigo. In RGB it is rgb(96, 76, 227), and in HSL hsl(248, 73%, 59%).

Is #604CE3 accessible as text?

On white, #604CE3 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 #604CE3, use white for the best readability.

What is the closest Tailwind color to #604CE3?

The nearest Tailwind CSS token is indigo-600 (#4F39F6).

What colors go well with #604CE3?

#604CE3 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #CEE34A. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #604CE3 below.

Is #604CE3 good for buttons?

#604CE3 works well for buttons and highlights, but use white text on #604CE3 — black text only reaches 3.64:1, below the 4.5:1 needed for normal-size labels.

Is #604CE3 the same as CSS slateblue?

No — #604CE3 is not the CSS named color slateblue, but slateblue (#6A5ACD) is the closest CSS named color.

#604CE3 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #604CE3

Not just a swatch — here's how #604CE3 works with other colors. Named schemes with #604CE3 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #604CE3 Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #8079FF

Iris is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Iris.

Berry & Cream Lead · 5 colors

Lead #604CE3 Surface #F5E5D8 Anchor #5B2142 Accent #E5C2C9 Secondary #332B2F

Iris 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 #604CE3 Secondary #8D90C3 Support #9D9088 Ink #18140F

Iris 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 Iris carrying the quiet middle.

Coastal Morning Lead · 5 colors

Lead #604CE3 Accent #A5C4C3 Surface #EAD5BF Secondary #9AA0A1 Anchor #22334A

Iris 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 #604CE3 Secondary #E86A70 Accent #F5934D Anchor #583B57 Surface #F7E7D7

Iris 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 #604CE3 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 19/100

Cool

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

Softness 32/100

Low

Firm and assertive — carries weight and contrast.

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 20/100

Very low

Clean and current — no dusty, aged cast.

Luxury 47/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 84/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 78/100

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 68/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #604CE3

For UI

For branding

For interior

For fashion

People also use #604CE3 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 #E2DFF5 for cards and hover fills. Tint 80

Avoid beside #914AE3 — 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 #604CE3 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: #604CE3;
  --color-base-rgb: 96 76 227;
  --color-base-oklch: oklch(53.0% 0.218 282.0);
  --color-50: #F3F1FD;
  --color-100: #DFDBFA;
  --color-200: #C0B9F4;
  --color-300: #9588E7;
  --color-400: #6D5DD5;
  --color-500: #4B3ABB;
  --color-600: #40338E;
  --color-700: #322A65;
  --color-800: #241F42;
  --color-900: #171528;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  iris: {
    50: '#F3F1FD',
    100: '#DFDBFA',
    200: '#C0B9F4',
    300: '#9588E7',
    400: '#6D5DD5',
    500: '#4B3ABB',
    600: '#40338E',
    700: '#322A65',
    800: '#241F42',
    900: '#171528',
  },
}

$base: #604CE3;
$base-ink: #FFFFFF;
$base-50: #F3F1FD;
$base-100: #DFDBFA;
$base-200: #C0B9F4;
$base-300: #9588E7;
$base-400: #6D5DD5;
$base-500: #4B3ABB;
$base-600: #40338E;
$base-700: #322A65;
$base-800: #241F42;
$base-900: #171528;
$base-hover: #3820D0;
$base-subtle: #D3CEF1;

{
    "color": {
        "base": {
            "value": "#604CE3",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F1FD",
                "type": "color"
            },
            "100": {
                "value": "#DFDBFA",
                "type": "color"
            },
            "200": {
                "value": "#C0B9F4",
                "type": "color"
            },
            "300": {
                "value": "#9588E7",
                "type": "color"
            },
            "400": {
                "value": "#6D5DD5",
                "type": "color"
            },
            "500": {
                "value": "#4B3ABB",
                "type": "color"
            },
            "600": {
                "value": "#40338E",
                "type": "color"
            },
            "700": {
                "value": "#322A65",
                "type": "color"
            },
            "800": {
                "value": "#241F42",
                "type": "color"
            },
            "900": {
                "value": "#171528",
                "type": "color"
            }
        }
    }
}

Palettes built on #604CE3

Color Lab

Pairs with #604CE3

UI roles & guardrails

In real applications

Scales

Every model

Export