What color is #667DEF?

#667DEF is a light, vivid blue-violet. In RGB it is rgb(102, 125, 239), and in HSL hsl(230, 81%, 67%).

Is #667DEF accessible as text?

On white, #667DEF has a contrast ratio of 3.66:1 (fails WCAG AA for body text); on black it is 5.74:1 (passes). For text placed on #667DEF, use black for the best readability.

What is the closest Tailwind color to #667DEF?

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

What colors go well with #667DEF?

#667DEF pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #EFD867. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #667DEF below.

Is #667DEF good for buttons?

#667DEF works well for buttons and highlights, but use black text on #667DEF — white text only reaches 3.66:1, below the 4.5:1 needed for normal-size labels.

Is #667DEF the same as CSS mediumslateblue?

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

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

Palettes built on #667DEF

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

Coastal Morning Lead · 5 colors

Lead #667DEF 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.

Nordic Calm Accent · 5 colors

Accent #667DEF 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.

Tech Product Signal · 5 colors

Signal #667DEF 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.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #667DEF Secondary #A6B2DB 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.

Modern Café Dominant · 5 colors

Dominant #667DEF Anchor #3B2924 Surface #F3E1D2 Accent #769E7A 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.

Build a working theme in the generator →

Color Lab

How #667DEF 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 43/100

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 32/100

Low

A faint retro warmth without tipping into sepia.

Luxury 42/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 66/100

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 20/100

Very low

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

Print safety 71/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #667DEF

For UI

For branding

For interior

For fashion

People also use #667DEF 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 5.1:1. Use

Subtle surface Use #E4E8F8 for cards and hover fills. Tint 80

Avoid beside #7D67EF — 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 #667DEF 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: #667DEF;
  --color-base-rgb: 102 125 239;
  --color-base-oklch: oklch(62.8% 0.172 272.0);
  --color-50: #F1F3FE;
  --color-100: #D9DFFC;
  --color-200: #B5C0F7;
  --color-300: #8395EC;
  --color-400: #566CDC;
  --color-500: #334BC2;
  --color-600: #2E3F93;
  --color-700: #273268;
  --color-800: #1D2344;
  --color-900: #14172A;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  medium-slate-blue: {
    50: '#F1F3FE',
    100: '#D9DFFC',
    200: '#B5C0F7',
    300: '#8395EC',
    400: '#566CDC',
    500: '#334BC2',
    600: '#2E3F93',
    700: '#273268',
    800: '#1D2344',
    900: '#14172A',
  },
}

$base: #667DEF;
$base-ink: #141310;
$base-50: #F1F3FE;
$base-100: #D9DFFC;
$base-200: #B5C0F7;
$base-300: #8395EC;
$base-400: #566CDC;
$base-500: #334BC2;
$base-600: #2E3F93;
$base-700: #273268;
$base-800: #1D2344;
$base-900: #14172A;
$base-hover: #2949E9;
$base-subtle: #D6DBF5;

{
    "color": {
        "base": {
            "value": "#667DEF",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F3FE",
                "type": "color"
            },
            "100": {
                "value": "#D9DFFC",
                "type": "color"
            },
            "200": {
                "value": "#B5C0F7",
                "type": "color"
            },
            "300": {
                "value": "#8395EC",
                "type": "color"
            },
            "400": {
                "value": "#566CDC",
                "type": "color"
            },
            "500": {
                "value": "#334BC2",
                "type": "color"
            },
            "600": {
                "value": "#2E3F93",
                "type": "color"
            },
            "700": {
                "value": "#273268",
                "type": "color"
            },
            "800": {
                "value": "#1D2344",
                "type": "color"
            },
            "900": {
                "value": "#14172A",
                "type": "color"
            }
        }
    }
}