What color is #646FEB?

#646FEB is a light, vivid blue-violet. In RGB it is rgb(100, 111, 235), and in HSL hsl(235, 77%, 66%).

Is #646FEB accessible as text?

On white, #646FEB has a contrast ratio of 4.19:1 (fails WCAG AA for body text); on black it is 5.02:1 (passes). For text placed on #646FEB, use black for the best readability.

What is the closest Tailwind color to #646FEB?

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

What colors go well with #646FEB?

#646FEB pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #EBE066. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #646FEB below.

Is #646FEB good for buttons?

#646FEB works well for buttons and highlights, but use black text on #646FEB — white text only reaches 4.19:1, below the 4.5:1 needed for normal-size labels.

Is #646FEB the same as CSS mediumslateblue?

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

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

Palettes built on #646FEB

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

Coastal Morning Lead · 5 colors

Lead #646FEB 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.

Vintage Leather Lead · 5 colors

Lead #646FEB Secondary #7F4534 Surface #EED7C2 Accent #365247 Anchor #582239

Medium 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 #646FEB Anchor #3B2924 Surface #F3E1D2 Accent #769F7B Secondary #3C3734

Medium 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 #646FEB 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 #646FEB Secondary #9EA7D3 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.

Build a working theme in the generator →

Color Lab

How #646FEB 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 39/100

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 30/100

Low

A faint retro warmth without tipping into sepia.

Luxury 44/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 50/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 85/100

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 70/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #646FEB

For UI

For branding

For interior

For fashion

People also use #646FEB with

Baby Blue Medium Purple 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 #E4E6F7 for cards and hover fills. Tint 80

Avoid beside #8766EB — 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 #646FEB at work across the surfaces designers actually ship.

Website / UI

Northwind Sign up

Build faster.

A working theme, generated in seconds.

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: #646FEB;
  --color-base-rgb: 100 111 235;
  --color-base-oklch: oklch(59.8% 0.185 275.5);
  --color-50: #F1F2FE;
  --color-100: #DADDFB;
  --color-200: #B7BCF5;
  --color-300: #868EE9;
  --color-400: #5964D9;
  --color-500: #3742BE;
  --color-600: #313991;
  --color-700: #282D66;
  --color-800: #1E2143;
  --color-900: #141629;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  medium-slate-blue: {
    50: '#F1F2FE',
    100: '#DADDFB',
    200: '#B7BCF5',
    300: '#868EE9',
    400: '#5964D9',
    500: '#3742BE',
    600: '#313991',
    700: '#282D66',
    800: '#1E2143',
    900: '#141629',
  },
}

$base: #646FEB;
$base-ink: #141310;
$base-50: #F1F2FE;
$base-100: #DADDFB;
$base-200: #B7BCF5;
$base-300: #868EE9;
$base-400: #5964D9;
$base-500: #3742BE;
$base-600: #313991;
$base-700: #282D66;
$base-800: #1E2143;
$base-900: #141629;
$base-hover: #2A39E3;
$base-subtle: #D6D8F4;

{
    "color": {
        "base": {
            "value": "#646FEB",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F2FE",
                "type": "color"
            },
            "100": {
                "value": "#DADDFB",
                "type": "color"
            },
            "200": {
                "value": "#B7BCF5",
                "type": "color"
            },
            "300": {
                "value": "#868EE9",
                "type": "color"
            },
            "400": {
                "value": "#5964D9",
                "type": "color"
            },
            "500": {
                "value": "#3742BE",
                "type": "color"
            },
            "600": {
                "value": "#313991",
                "type": "color"
            },
            "700": {
                "value": "#282D66",
                "type": "color"
            },
            "800": {
                "value": "#1E2143",
                "type": "color"
            },
            "900": {
                "value": "#141629",
                "type": "color"
            }
        }
    }
}

Palettes built on #646FEB

Color Lab

Pairs with #646FEB

UI roles & guardrails

In real applications

Scales

Every model

Export