What color is #646EF7?

#646EF7 is a light, vivid blue-violet. In RGB it is rgb(100, 110, 247), and in HSL hsl(236, 90%, 68%).

Is #646EF7 accessible as text?

On white, #646EF7 has a contrast ratio of 4.11:1 (fails WCAG AA for body text); on black it is 5.12:1 (passes). For text placed on #646EF7, use black for the best readability.

What is the closest Tailwind color to #646EF7?

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

What colors go well with #646EF7?

#646EF7 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #F7ED64. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #646EF7 below.

Is #646EF7 good for buttons?

#646EF7 works well for buttons and highlights, but use black text on #646EF7 — white text only reaches 4.11:1, below the 4.5:1 needed for normal-size labels.

Is #646EF7 the same as CSS mediumslateblue?

No — #646EF7 is not the CSS named color mediumslateblue, but mediumslateblue (#7B68EE) is the closest CSS named color.

#646EF7 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #646EF7

Not just a swatch — here's how #646EF7 works with other colors. Named schemes with #646EF7 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #646EF7 Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #8898FF

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 #646EF7 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 #646EF7 Secondary #9FA9D9 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 #646EF7 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 #646EF7 Secondary #E86A72 Accent #F6924E Anchor #573B57 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 #646EF7 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 38/100

Low

Middle-weight — neither delicate nor heavy.

Depth 42/100

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 24/100

Low

Clean and current — no dusty, aged cast.

Luxury 42/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 78/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 78/100

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 68/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #646EF7

For UI

For branding

For interior

For fashion

People also use #646EF7 with

Light Sky Blue Medium Orchid Flax Gainsboro Prussian Blue

UI roles & guardrails

Primary action Safe as a filled button with near-black label. AA

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 4.5:1. Use

Subtle surface Use #E4E6F9 for cards and hover fills. Tint 80

Avoid beside #8B64F7 — 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 #646EF7 at work across the surfaces designers actually ship.

Website / UI

Northwind Sign up

Build faster.

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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: #646EF7;
  --color-base-rgb: 100 110 247;
  --color-base-oklch: oklch(60.5% 0.202 275.4);
  --color-50: #F0F1FE;
  --color-100: #D8DAFD;
  --color-200: #B2B6FB;
  --color-300: #7E85F2;
  --color-400: #4F58E3;
  --color-500: #2B36CA;
  --color-600: #293099;
  --color-700: #23286C;
  --color-800: #1B1E46;
  --color-900: #12142B;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  medium-slate-blue: {
    50: '#F0F1FE',
    100: '#D8DAFD',
    200: '#B2B6FB',
    300: '#7E85F2',
    400: '#4F58E3',
    500: '#2B36CA',
    600: '#293099',
    700: '#23286C',
    800: '#1B1E46',
    900: '#12142B',
  },
}

$base: #646EF7;
$base-ink: #141310;
$base-50: #F0F1FE;
$base-100: #D8DAFD;
$base-200: #B2B6FB;
$base-300: #7E85F2;
$base-400: #4F58E3;
$base-500: #2B36CA;
$base-600: #293099;
$base-700: #23286C;
$base-800: #1B1E46;
$base-900: #12142B;
$base-hover: #2230F3;
$base-subtle: #D6D8F7;

{
    "color": {
        "base": {
            "value": "#646EF7",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F1FE",
                "type": "color"
            },
            "100": {
                "value": "#D8DAFD",
                "type": "color"
            },
            "200": {
                "value": "#B2B6FB",
                "type": "color"
            },
            "300": {
                "value": "#7E85F2",
                "type": "color"
            },
            "400": {
                "value": "#4F58E3",
                "type": "color"
            },
            "500": {
                "value": "#2B36CA",
                "type": "color"
            },
            "600": {
                "value": "#293099",
                "type": "color"
            },
            "700": {
                "value": "#23286C",
                "type": "color"
            },
            "800": {
                "value": "#1B1E46",
                "type": "color"
            },
            "900": {
                "value": "#12142B",
                "type": "color"
            }
        }
    }
}

Palettes built on #646EF7

Color Lab

Pairs with #646EF7

UI roles & guardrails

In real applications

Scales

Every model

Export