What color is #665CC2?

#665CC2 is a medium indigo. In RGB it is rgb(102, 92, 194), and in HSL hsl(246, 46%, 56%).

Is #665CC2 accessible as text?

On white, #665CC2 has a contrast ratio of 5.42:1 (passes WCAG AA for body text); on black it is 3.87:1 (fails). For text placed on #665CC2, use white for the best readability.

What is the closest Tailwind color to #665CC2?

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

What colors go well with #665CC2?

#665CC2 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #B8C25B. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #665CC2 below.

Is #665CC2 good for buttons?

#665CC2 works well for buttons and highlights, but use white text on #665CC2 — black text only reaches 3.87:1, below the 4.5:1 needed for normal-size labels.

Is #665CC2 the same as CSS slateblue?

No — #665CC2 is not the CSS named color slateblue, but slateblue (#6A5ACD) is the closest CSS named color.

#665CC2 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #665CC2

Not just a swatch — here's how #665CC2 works with other colors. Named schemes with #665CC2 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #665CC2 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.

Vintage Leather Lead · 5 colors

Lead #665CC2 Secondary #7E4533 Surface #EDD7C2 Accent #365247 Anchor #582238

Slate Blue 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 #665CC2 Anchor #3B2923 Surface #F3E1D2 Accent #759F7C Secondary #3C3734

Slate Blue 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 #665CC2 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 #665CC2 Secondary #9393B8 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.

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Color Lab

How #665CC2 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 23/100

Cool

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

Softness 39/100

Low

Middle-weight — neither delicate nor heavy.

Depth 48/100

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 43/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 51/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 42/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 99/100

Very high

Strong interactive accent — visible and can carry a legible label.

Surface fit 11/100

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 #665CC2

For UI

For branding

For interior

For fashion

People also use #665CC2 with

Iceberg Amethyst Dark Khaki 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 5.4:1. Use

Subtle surface Use #E3E1F0 for cards and hover fills. Tint 80

Avoid beside #885BC2 — 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 #665CC2 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: #665CC2;
  --color-base-rgb: 102 92 194;
  --color-base-oklch: oklch(53.6% 0.154 284.4);
  --color-50: #F4F3FB;
  --color-100: #E3E1F5;
  --color-200: #C7C4E9;
  --color-300: #A09AD5;
  --color-400: #7B73BF;
  --color-500: #5A52A3;
  --color-600: #4A447E;
  --color-700: #39355A;
  --color-800: #28253C;
  --color-900: #1A1825;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  slate-blue: {
    50: '#F4F3FB',
    100: '#E3E1F5',
    200: '#C7C4E9',
    300: '#A09AD5',
    400: '#7B73BF',
    500: '#5A52A3',
    600: '#4A447E',
    700: '#39355A',
    800: '#28253C',
    900: '#1A1825',
  },
}

$base: #665CC2;
$base-ink: #FFFFFF;
$base-50: #F4F3FB;
$base-100: #E3E1F5;
$base-200: #C7C4E9;
$base-300: #A09AD5;
$base-400: #7B73BF;
$base-500: #5A52A3;
$base-600: #4A447E;
$base-700: #39355A;
$base-800: #28253C;
$base-900: #1A1825;
$base-hover: #483EA7;
$base-subtle: #D4D2E9;

{
    "color": {
        "base": {
            "value": "#665CC2",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F3FB",
                "type": "color"
            },
            "100": {
                "value": "#E3E1F5",
                "type": "color"
            },
            "200": {
                "value": "#C7C4E9",
                "type": "color"
            },
            "300": {
                "value": "#A09AD5",
                "type": "color"
            },
            "400": {
                "value": "#7B73BF",
                "type": "color"
            },
            "500": {
                "value": "#5A52A3",
                "type": "color"
            },
            "600": {
                "value": "#4A447E",
                "type": "color"
            },
            "700": {
                "value": "#39355A",
                "type": "color"
            },
            "800": {
                "value": "#28253C",
                "type": "color"
            },
            "900": {
                "value": "#1A1825",
                "type": "color"
            }
        }
    }
}

Palettes built on #665CC2

Color Lab

Pairs with #665CC2

UI roles & guardrails

In real applications

Scales

Every model

Export