What color is #635DCB?

#635DCB is a medium blue-violet. In RGB it is rgb(99, 93, 203), and in HSL hsl(243, 51%, 58%).

Is #635DCB accessible as text?

On white, #635DCB has a contrast ratio of 5.30:1 (passes WCAG AA for body text); on black it is 3.96:1 (fails). For text placed on #635DCB, use white for the best readability.

What is the closest Tailwind color to #635DCB?

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

What colors go well with #635DCB?

#635DCB pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #C5CB5D. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #635DCB below.

Is #635DCB good for buttons?

#635DCB works well for buttons and highlights, but use white text on #635DCB — black text only reaches 3.96:1, below the 4.5:1 needed for normal-size labels.

Is #635DCB the same as CSS slateblue?

No — #635DCB is not the CSS named color slateblue, but slateblue (#6A5ACD) is the closest CSS named color.

#635DCB Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #635DCB

Not just a swatch — here's how #635DCB works with other colors. Named schemes with #635DCB in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #635DCB 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 #635DCB Secondary #7F4534 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 #635DCB 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 #635DCB Surface #F5E5D8 Anchor #5B2142 Accent #E5C2C9 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 #635DCB Secondary #9295BC 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 #635DCB 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 20/100

Cool

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

Softness 38/100

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 39/100

Low

A faint retro warmth without tipping into sepia.

Luxury 50/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 45/100

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 11/100

Very low

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

Print safety 75/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #635DCB

For UI

For branding

For interior

For fashion

People also use #635DCB with

Iceberg Amethyst Citrine 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 5.3:1. Use

Subtle surface Use #E3E2F1 for cards and hover fills. Tint 80

Avoid beside #875DCB — 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 #635DCB 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: #635DCB;
  --color-base-rgb: 99 93 203;
  --color-base-oklch: oklch(54.2% 0.165 281.8);
  --color-50: #F4F3FC;
  --color-100: #E1E0F6;
  --color-200: #C4C1EB;
  --color-300: #9A97D9;
  --color-400: #736FC3;
  --color-500: #524EA7;
  --color-600: #444181;
  --color-700: #35335C;
  --color-800: #25243D;
  --color-900: #181826;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  slate-blue: {
    50: '#F4F3FC',
    100: '#E1E0F6',
    200: '#C4C1EB',
    300: '#9A97D9',
    400: '#736FC3',
    500: '#524EA7',
    600: '#444181',
    700: '#35335C',
    800: '#25243D',
    900: '#181826',
  },
}

$base: #635DCB;
$base-ink: #FFFFFF;
$base-50: #F4F3FC;
$base-100: #E1E0F6;
$base-200: #C4C1EB;
$base-300: #9A97D9;
$base-400: #736FC3;
$base-500: #524EA7;
$base-600: #444181;
$base-700: #35335C;
$base-800: #25243D;
$base-900: #181826;
$base-hover: #403AB3;
$base-subtle: #D4D2EB;

{
    "color": {
        "base": {
            "value": "#635DCB",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F3FC",
                "type": "color"
            },
            "100": {
                "value": "#E1E0F6",
                "type": "color"
            },
            "200": {
                "value": "#C4C1EB",
                "type": "color"
            },
            "300": {
                "value": "#9A97D9",
                "type": "color"
            },
            "400": {
                "value": "#736FC3",
                "type": "color"
            },
            "500": {
                "value": "#524EA7",
                "type": "color"
            },
            "600": {
                "value": "#444181",
                "type": "color"
            },
            "700": {
                "value": "#35335C",
                "type": "color"
            },
            "800": {
                "value": "#25243D",
                "type": "color"
            },
            "900": {
                "value": "#181826",
                "type": "color"
            }
        }
    }
}

Palettes built on #635DCB

Color Lab

Pairs with #635DCB

UI roles & guardrails

In real applications

Scales

Every model

Export