What color is #667CFB?

#667CFB is a light, vivid blue-violet. In RGB it is rgb(102, 124, 251), and in HSL hsl(231, 95%, 69%).

Is #667CFB accessible as text?

On white, #667CFB has a contrast ratio of 3.60:1 (fails WCAG AA for body text); on black it is 5.84:1 (passes). For text placed on #667CFB, use black for the best readability.

What is the closest Tailwind color to #667CFB?

The nearest Tailwind CSS token is indigo-400 (#7C86FF).

What colors go well with #667CFB?

#667CFB pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #FBE565. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #667CFB below.

Is #667CFB good for buttons?

#667CFB works well for buttons and highlights, but use black text on #667CFB — white text only reaches 3.60:1, below the 4.5:1 needed for normal-size labels.

Is #667CFB the same as CSS mediumslateblue?

No — #667CFB is not the CSS named color mediumslateblue, but mediumslateblue (#7B68EE) is the closest CSS named color.

#667CFB Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #667CFB

Not just a swatch — here's how #667CFB works with other colors. Named schemes with #667CFB in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #667CFB Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #8CA5FF

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.

Nordic Calm Accent · 5 colors

Accent #667CFB Secondary #AEB4B8 Surface #F1F2F0 Support #7E92A7 Anchor #2E3236

Medium Slate Blue keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.

Coastal Morning Lead · 5 colors

Lead #667CFB Accent #A5C4C2 Surface #EAD5C0 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.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #667CFB Secondary #A7B4E1 Support #9D8F88 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.

Sunset Warmth Glow · 5 colors

Glow #667CFB Secondary #E86A73 Accent #F6924F Anchor #573B58 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 #667CFB 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 13/100

Cool

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

Softness 41/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 39/100

Low

Mid depth — usable as an accent or a muted ground.

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 26/100

Low

A faint retro warmth without tipping into sepia.

Luxury 40/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 73/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 75/100

High

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

Surface fit 20/100

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 #667CFB

For UI

For branding

For interior

For fashion

People also use #667CFB with

Baby Blue Medium Purple 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 5.2:1. Use

Subtle surface Use #E4E8FA for cards and hover fills. Tint 80

Avoid beside #8065FB — 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 #667CFB 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: #667CFB;
  --color-base-rgb: 102 124 251;
  --color-base-oklch: oklch(63.4% 0.189 272.5);
  --color-50: #F0F2FE;
  --color-100: #D8DDFD;
  --color-200: #B1BCFC;
  --color-300: #7A8DF5;
  --color-400: #4A62E8;
  --color-500: #2740CE;
  --color-600: #26389C;
  --color-700: #212D6E;
  --color-800: #1A2047;
  --color-900: #12162B;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  medium-slate-blue: {
    50: '#F0F2FE',
    100: '#D8DDFD',
    200: '#B1BCFC',
    300: '#7A8DF5',
    400: '#4A62E8',
    500: '#2740CE',
    600: '#26389C',
    700: '#212D6E',
    800: '#1A2047',
    900: '#12162B',
  },
}

$base: #667CFB;
$base-ink: #141310;
$base-50: #F0F2FE;
$base-100: #D8DDFD;
$base-200: #B1BCFC;
$base-300: #7A8DF5;
$base-400: #4A62E8;
$base-500: #2740CE;
$base-600: #26389C;
$base-700: #212D6E;
$base-800: #1A2047;
$base-900: #12162B;
$base-hover: #2041F9;
$base-subtle: #D6DBF8;

{
    "color": {
        "base": {
            "value": "#667CFB",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F2FE",
                "type": "color"
            },
            "100": {
                "value": "#D8DDFD",
                "type": "color"
            },
            "200": {
                "value": "#B1BCFC",
                "type": "color"
            },
            "300": {
                "value": "#7A8DF5",
                "type": "color"
            },
            "400": {
                "value": "#4A62E8",
                "type": "color"
            },
            "500": {
                "value": "#2740CE",
                "type": "color"
            },
            "600": {
                "value": "#26389C",
                "type": "color"
            },
            "700": {
                "value": "#212D6E",
                "type": "color"
            },
            "800": {
                "value": "#1A2047",
                "type": "color"
            },
            "900": {
                "value": "#12162B",
                "type": "color"
            }
        }
    }
}

Palettes built on #667CFB

Color Lab

Pairs with #667CFB

UI roles & guardrails

In real applications

Scales

Every model

Export