What color is #645BFD?

#645BFD is a light, vivid blue-violet. In RGB it is rgb(100, 91, 253), and in HSL hsl(243, 98%, 67%).

Is #645BFD accessible as text?

On white, #645BFD has a contrast ratio of 4.71:1 (passes WCAG AA for body text); on black it is 4.46:1 (fails). For text placed on #645BFD, use white for the best readability.

What is the closest Tailwind color to #645BFD?

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

What colors go well with #645BFD?

#645BFD pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #F5FD58. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #645BFD below.

Is #645BFD good for buttons?

#645BFD works well for buttons and highlights, but use white text on #645BFD — black text only reaches 4.46:1, below the 4.5:1 needed for normal-size labels.

Is #645BFD the same as CSS mediumslateblue?

No — #645BFD is not the CSS named color mediumslateblue, but mediumslateblue (#7B68EE) is the closest CSS named color.

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

Palettes built on #645BFD

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

Tech Product Signal · 5 colors

Signal #645BFD Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #8588FF

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 #645BFD Surface #F6E5D8 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 #645BFD Secondary #989FD7 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 #645BFD Accent #A5C4C2 Surface #EAD5BF Secondary #9AA0A1 Anchor #22344A

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 #645BFD Secondary #E86A71 Accent #F6934E 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 #645BFD 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 17/100

Cool

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

Softness 32/100

Low

Middle-weight — neither delicate nor heavy.

Depth 46/100

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 14/100

Very low

Clean and current — no dusty, aged cast.

Luxury 43/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 90/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 69/100

High

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

Surface fit 15/100

Very low

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

Print safety 64/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #645BFD

For UI

For branding

For interior

For fashion

People also use #645BFD with

Maya Blue Medium Orchid Flax 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 4.7:1. Use

Subtle surface Use #E3E2FA for cards and hover fills. Tint 80

Avoid beside #9858FD — 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 #645BFD 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: #645BFD;
  --color-base-rgb: 100 91 253;
  --color-base-oklch: oklch(57.7% 0.232 278.7);
  --color-50: #F1F0FE;
  --color-100: #DAD8FD;
  --color-200: #B4B1FC;
  --color-300: #7F78F7;
  --color-400: #5048EA;
  --color-500: #2D24D1;
  --color-600: #2A249E;
  --color-700: #24206F;
  --color-800: #1B1948;
  --color-900: #13112C;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  iris: {
    50: '#F1F0FE',
    100: '#DAD8FD',
    200: '#B4B1FC',
    300: '#7F78F7',
    400: '#5048EA',
    500: '#2D24D1',
    600: '#2A249E',
    700: '#24206F',
    800: '#1B1948',
    900: '#13112C',
  },
}

$base: #645BFD;
$base-ink: #FFFFFF;
$base-50: #F1F0FE;
$base-100: #DAD8FD;
$base-200: #B4B1FC;
$base-300: #7F78F7;
$base-400: #5048EA;
$base-500: #2D24D1;
$base-600: #2A249E;
$base-700: #24206F;
$base-800: #1B1948;
$base-900: #13112C;
$base-hover: #2015FD;
$base-subtle: #D5D3F9;

{
    "color": {
        "base": {
            "value": "#645BFD",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F0FE",
                "type": "color"
            },
            "100": {
                "value": "#DAD8FD",
                "type": "color"
            },
            "200": {
                "value": "#B4B1FC",
                "type": "color"
            },
            "300": {
                "value": "#7F78F7",
                "type": "color"
            },
            "400": {
                "value": "#5048EA",
                "type": "color"
            },
            "500": {
                "value": "#2D24D1",
                "type": "color"
            },
            "600": {
                "value": "#2A249E",
                "type": "color"
            },
            "700": {
                "value": "#24206F",
                "type": "color"
            },
            "800": {
                "value": "#1B1948",
                "type": "color"
            },
            "900": {
                "value": "#13112C",
                "type": "color"
            }
        }
    }
}

Palettes built on #645BFD

Color Lab

Pairs with #645BFD

UI roles & guardrails

In real applications

Scales

Every model

Export