What color is #645BDC?

#645BDC is a medium blue-violet. In RGB it is rgb(100, 91, 220), and in HSL hsl(244, 65%, 61%).

Is #645BDC accessible as text?

On white, #645BDC has a contrast ratio of 5.16:1 (passes WCAG AA for body text); on black it is 4.07:1 (fails). For text placed on #645BDC, use white for the best readability.

What is the closest Tailwind color to #645BDC?

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

What colors go well with #645BDC?

#645BDC pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #D4DC5B. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #645BDC below.

Is #645BDC good for buttons?

#645BDC works well for buttons and highlights, but use white text on #645BDC — black text only reaches 4.07:1, below the 4.5:1 needed for normal-size labels.

Is #645BDC the same as CSS slateblue?

No — #645BDC is not the CSS named color slateblue, but slateblue (#6A5ACD) is the closest CSS named color.

#645BDC Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #645BDC

Not just a swatch — here's how #645BDC works with other colors. Named schemes with #645BDC in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #645BDC Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #8685FB

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 #645BDC Surface #F5E5D8 Anchor #5B2142 Accent #E5C2C9 Secondary #322B2F

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 #645BDC Secondary #9497C5 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 #645BDC 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 #645BDC 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 #645BDC 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 36/100

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 30/100

Low

A faint retro warmth without tipping into sepia.

Luxury 47/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 74/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 90/100

Very high

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

Surface fit 12/100

Very low

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

Print safety 72/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #645BDC

For UI

For branding

For interior

For fashion

People also use #645BDC 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 5.2:1. Use

Subtle surface Use #E3E2F4 for cards and hover fills. Tint 80

Avoid beside #8F5BDC — 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 #645BDC 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: #645BDC;
  --color-base-rgb: 100 91 220;
  --color-base-oklch: oklch(55.1% 0.190 281.3);
  --color-50: #F3F2FD;
  --color-100: #DEDDF9;
  --color-200: #BFBCF1;
  --color-300: #938EE2;
  --color-400: #6A63CF;
  --color-500: #4941B4;
  --color-600: #3E3889;
  --color-700: #312D62;
  --color-800: #232140;
  --color-900: #171627;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  iris: {
    50: '#F3F2FD',
    100: '#DEDDF9',
    200: '#BFBCF1',
    300: '#938EE2',
    400: '#6A63CF',
    500: '#4941B4',
    600: '#3E3889',
    700: '#312D62',
    800: '#232140',
    900: '#171627',
  },
}

$base: #645BDC;
$base-ink: #FFFFFF;
$base-50: #F3F2FD;
$base-100: #DEDDF9;
$base-200: #BFBCF1;
$base-300: #938EE2;
$base-400: #6A63CF;
$base-500: #4941B4;
$base-600: #3E3889;
$base-700: #312D62;
$base-800: #232140;
$base-900: #171627;
$base-hover: #362CCD;
$base-subtle: #D4D2F0;

{
    "color": {
        "base": {
            "value": "#645BDC",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F2FD",
                "type": "color"
            },
            "100": {
                "value": "#DEDDF9",
                "type": "color"
            },
            "200": {
                "value": "#BFBCF1",
                "type": "color"
            },
            "300": {
                "value": "#938EE2",
                "type": "color"
            },
            "400": {
                "value": "#6A63CF",
                "type": "color"
            },
            "500": {
                "value": "#4941B4",
                "type": "color"
            },
            "600": {
                "value": "#3E3889",
                "type": "color"
            },
            "700": {
                "value": "#312D62",
                "type": "color"
            },
            "800": {
                "value": "#232140",
                "type": "color"
            },
            "900": {
                "value": "#171627",
                "type": "color"
            }
        }
    }
}