What color is #646BF2?

#646BF2 is a light, vivid blue-violet. In RGB it is rgb(100, 107, 242), and in HSL hsl(237, 85%, 67%).

Is #646BF2 accessible as text?

On white, #646BF2 has a contrast ratio of 4.26:1 (fails WCAG AA for body text); on black it is 4.93:1 (passes). For text placed on #646BF2, use black for the best readability.

What is the closest Tailwind color to #646BF2?

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

What colors go well with #646BF2?

#646BF2 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #F2EB63. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #646BF2 below.

Is #646BF2 good for buttons?

#646BF2 works well for buttons and highlights, but use black text on #646BF2 — white text only reaches 4.26:1, below the 4.5:1 needed for normal-size labels.

Is #646BF2 the same as CSS mediumslateblue?

No — #646BF2 is not the CSS named color mediumslateblue, but mediumslateblue (#7B68EE) is the closest CSS named color.

#646BF2 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #646BF2

Not just a swatch — here's how #646BF2 works with other colors. Named schemes with #646BF2 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #646BF2 Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #8895FF

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

Berry & Cream Lead · 5 colors

Lead #646BF2 Surface #F6E5D8 Anchor #5B2143 Accent #E5C2C9 Secondary #322B2F

Medium 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 #646BF2 Secondary #9DA6D6 Support #9D9088 Ink #18140F

Medium 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 Medium Slate Blue carrying the quiet middle.

Coastal Morning Lead · 5 colors

Lead #646BF2 Accent #A5C4C2 Surface #EAD5BF Secondary #9AA0A1 Anchor #21344A

Medium Slate Blue 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 #646BF2 Secondary #E86A72 Accent #F6924E Anchor #583B57 Surface #F7E7D7

Medium Slate Blue 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 #646BF2 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 15/100

Cool

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

Softness 37/100

Low

Middle-weight — neither delicate nor heavy.

Depth 43/100

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 25/100

Low

Clean and current — no dusty, aged cast.

Luxury 43/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 77/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 81/100

Very high

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

Surface fit 17/100

Very low

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

Print safety 69/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #646BF2

For UI

For branding

For interior

For fashion

People also use #646BF2 with

Light Sky Blue Medium Orchid Flax Gainsboro Prussian Blue

UI roles & guardrails

Primary action Too mid-tone for a filled button — darken for the fill. AA Large

Body text Do not use for body copy on light surfaces. Avoid

Large display Fine for headings 24px+ on white. Pass

Background Pair with #141310 text at 4.4:1. Use

Subtle surface Use #E4E5F8 for cards and hover fills. Tint 80

Avoid beside #8C63F2 — 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 #646BF2 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: #646BF2;
  --color-base-rgb: 100 107 242;
  --color-base-oklch: oklch(59.6% 0.199 276.3);
  --color-50: #F0F1FE;
  --color-100: #D8DAFD;
  --color-200: #B4B7F9;
  --color-300: #8186EE;
  --color-400: #535ADF;
  --color-500: #3037C5;
  --color-600: #2C3196;
  --color-700: #25296A;
  --color-800: #1C1E45;
  --color-900: #13142A;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  medium-slate-blue: {
    50: '#F0F1FE',
    100: '#D8DAFD',
    200: '#B4B7F9',
    300: '#8186EE',
    400: '#535ADF',
    500: '#3037C5',
    600: '#2C3196',
    700: '#25296A',
    800: '#1C1E45',
    900: '#13142A',
  },
}

$base: #646BF2;
$base-ink: #141310;
$base-50: #F0F1FE;
$base-100: #D8DAFD;
$base-200: #B4B7F9;
$base-300: #8186EE;
$base-400: #535ADF;
$base-500: #3037C5;
$base-600: #2C3196;
$base-700: #25296A;
$base-800: #1C1E45;
$base-900: #13142A;
$base-hover: #242EED;
$base-subtle: #D5D7F6;

{
    "color": {
        "base": {
            "value": "#646BF2",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F1FE",
                "type": "color"
            },
            "100": {
                "value": "#D8DAFD",
                "type": "color"
            },
            "200": {
                "value": "#B4B7F9",
                "type": "color"
            },
            "300": {
                "value": "#8186EE",
                "type": "color"
            },
            "400": {
                "value": "#535ADF",
                "type": "color"
            },
            "500": {
                "value": "#3037C5",
                "type": "color"
            },
            "600": {
                "value": "#2C3196",
                "type": "color"
            },
            "700": {
                "value": "#25296A",
                "type": "color"
            },
            "800": {
                "value": "#1C1E45",
                "type": "color"
            },
            "900": {
                "value": "#13142A",
                "type": "color"
            }
        }
    }
}