What color is #647DAB?

#647DAB is a medium, muted blue. In RGB it is rgb(100, 125, 171), and in HSL hsl(219, 30%, 53%).

Is #647DAB accessible as text?

On white, #647DAB has a contrast ratio of 4.15:1 (fails WCAG AA for body text); on black it is 5.06:1 (passes). For text placed on #647DAB, use black for the best readability.

What is the closest Tailwind color to #647DAB?

The nearest Tailwind CSS token is mist-500 (#67787C).

What colors go well with #647DAB?

#647DAB pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #AB9263. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #647DAB below.

Is #647DAB good for buttons?

#647DAB works well for buttons and highlights, but use black text on #647DAB — white text only reaches 4.15:1, below the 4.5:1 needed for normal-size labels.

Is #647DAB the same as CSS steelblue?

No — #647DAB is not the CSS named color steelblue, but steelblue (#4682B4) is the closest CSS named color.

#647DAB Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #647DAB

Not just a swatch — here's how #647DAB works with other colors. Named schemes with #647DAB in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #647DAB Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

Glaucous 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 #647DAB Secondary #AEB4B8 Surface #F1F2F0 Support #7D93A6 Anchor #2E3236

Glaucous 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 #647DAB Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #8AA2CD

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

Vintage Leather Lead · 5 colors

Lead #647DAB Secondary #7F4536 Surface #E1DDC1 Accent #375246 Anchor #57223A

Glaucous plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #647DAB Secondary #9EA8B9 Support #9D8F88 Ink #18140F

Glaucous 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 Glaucous carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #647DAB 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 31/100

Cool

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

Softness 52/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 40/100

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 56/100

Moderate

Faded, nostalgic quality — editorial, heritage and retro work.

Luxury 47/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 21/100

Low

Quiet and neutral — a supporting tone, not a signature.

UI accent fit 80/100

High

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

Surface fit 38/100

Low

Usable as a tinted surface in measured doses.

Print safety 85/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #647DAB

For UI

For branding

For interior

For fashion

People also use #647DAB with

Cadet Grey Very Peri Camel Gainsboro Charcoal

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 4.5:1. Use

Subtle surface Use #E2E5EC for cards and hover fills. Tint 80

Avoid beside #6364AB — 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 #647DAB 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: #647DAB;
  --color-base-rgb: 100 125 171;
  --color-base-oklch: oklch(58.9% 0.077 262.2);
  --color-50: #F5F7FA;
  --color-100: #E4E9F1;
  --color-200: #CAD3E2;
  --color-300: #A4B2CB;
  --color-400: #8092B2;
  --color-500: #607295;
  --color-600: #4E5B74;
  --color-700: #3B4454;
  --color-800: #292E38;
  --color-900: #1B1D23;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  glaucous: {
    50: '#F5F7FA',
    100: '#E4E9F1',
    200: '#CAD3E2',
    300: '#A4B2CB',
    400: '#8092B2',
    500: '#607295',
    600: '#4E5B74',
    700: '#3B4454',
    800: '#292E38',
    900: '#1B1D23',
  },
}

$base: #647DAB;
$base-ink: #141310;
$base-50: #F5F7FA;
$base-100: #E4E9F1;
$base-200: #CAD3E2;
$base-300: #A4B2CB;
$base-400: #8092B2;
$base-500: #607295;
$base-600: #4E5B74;
$base-700: #3B4454;
$base-800: #292E38;
$base-900: #1B1D23;
$base-hover: #4C628D;
$base-subtle: #D3D9E3;

{
    "color": {
        "base": {
            "value": "#647DAB",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F7FA",
                "type": "color"
            },
            "100": {
                "value": "#E4E9F1",
                "type": "color"
            },
            "200": {
                "value": "#CAD3E2",
                "type": "color"
            },
            "300": {
                "value": "#A4B2CB",
                "type": "color"
            },
            "400": {
                "value": "#8092B2",
                "type": "color"
            },
            "500": {
                "value": "#607295",
                "type": "color"
            },
            "600": {
                "value": "#4E5B74",
                "type": "color"
            },
            "700": {
                "value": "#3B4454",
                "type": "color"
            },
            "800": {
                "value": "#292E38",
                "type": "color"
            },
            "900": {
                "value": "#1B1D23",
                "type": "color"
            }
        }
    }
}

Palettes built on #647DAB

Color Lab

Pairs with #647DAB

UI roles & guardrails

In real applications

Scales

Every model

Export