What color is #638BBD?

#638BBD is a medium blue. In RGB it is rgb(99, 139, 189), and in HSL hsl(213, 41%, 56%).

Is #638BBD accessible as text?

On white, #638BBD has a contrast ratio of 3.52:1 (fails WCAG AA for body text); on black it is 5.96:1 (passes). For text placed on #638BBD, use black for the best readability.

What is the closest Tailwind color to #638BBD?

The nearest Tailwind CSS token is cyan-600 (#0092B8).

What colors go well with #638BBD?

#638BBD pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #BD9361. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #638BBD below.

Is #638BBD good for buttons?

#638BBD works well for buttons and highlights, but use black text on #638BBD — white text only reaches 3.52:1, below the 4.5:1 needed for normal-size labels.

Is #638BBD the same as CSS steelblue?

No — #638BBD is not the CSS named color steelblue, but steelblue (#4682B4) is the closest CSS named color.

#638BBD Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #638BBD

Not just a swatch — here's how #638BBD works with other colors. Named schemes with #638BBD in its natural role, and a note on why the supporting colors balance it.

Nordic Calm Accent · 5 colors

Accent #638BBD Secondary #AEB4B8 Surface #F1F2F0 Support #7D93A6 Anchor #2E3236

Ocean 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 #638BBD Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

Ocean Blue opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.

Japanese Sand Base · 5 colors

Base #638BBD Surface #EBEADC Highlight #F4F2E7 Secondary #B2B2A0 Ink #2C2724

Ocean Blue sets a calm, sun-bleached base here, wrapped in bone and paper off-whites and a soft greige, with a single ink accent for wabi-sabi restraint.

Tech Product Signal · 5 colors

Signal #638BBD Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #8BB0DF

Ocean 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 Ocean Blue.

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #638BBD Secondary #A7B5C7 Support #9D8F89 Ink #16140F

Ocean 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 Ocean Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #638BBD 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 26/100

Cool

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

Softness 54/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 37/100

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 54/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 44/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 34/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 76/100

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 82/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #638BBD

For UI

For branding

For interior

For fashion

People also use #638BBD with

Medium Turquoise Tanzanite Camel Gainsboro Charcoal

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 5.3:1. Use

Subtle surface Use #E2E8EF for cards and hover fills. Tint 80

Avoid beside #616CBD — 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 #638BBD 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: #638BBD;
  --color-base-rgb: 99 139 189;
  --color-base-oklch: oklch(62.8% 0.088 254.5);
  --color-50: #F4F7FB;
  --color-100: #E2EAF3;
  --color-200: #C6D5E7;
  --color-300: #9DB5D2;
  --color-400: #7796BB;
  --color-500: #56779E;
  --color-600: #475E7A;
  --color-700: #374658;
  --color-800: #272F3A;
  --color-900: #191E24;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  ocean-blue: {
    50: '#F4F7FB',
    100: '#E2EAF3',
    200: '#C6D5E7',
    300: '#9DB5D2',
    400: '#7796BB',
    500: '#56779E',
    600: '#475E7A',
    700: '#374658',
    800: '#272F3A',
    900: '#191E24',
  },
}

$base: #638BBD;
$base-ink: #141310;
$base-50: #F4F7FB;
$base-100: #E2EAF3;
$base-200: #C6D5E7;
$base-300: #9DB5D2;
$base-400: #7796BB;
$base-500: #56779E;
$base-600: #475E7A;
$base-700: #374658;
$base-800: #272F3A;
$base-900: #191E24;
$base-hover: #436EA1;
$base-subtle: #D3DCE8;

{
    "color": {
        "base": {
            "value": "#638BBD",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F7FB",
                "type": "color"
            },
            "100": {
                "value": "#E2EAF3",
                "type": "color"
            },
            "200": {
                "value": "#C6D5E7",
                "type": "color"
            },
            "300": {
                "value": "#9DB5D2",
                "type": "color"
            },
            "400": {
                "value": "#7796BB",
                "type": "color"
            },
            "500": {
                "value": "#56779E",
                "type": "color"
            },
            "600": {
                "value": "#475E7A",
                "type": "color"
            },
            "700": {
                "value": "#374658",
                "type": "color"
            },
            "800": {
                "value": "#272F3A",
                "type": "color"
            },
            "900": {
                "value": "#191E24",
                "type": "color"
            }
        }
    }
}

Palettes built on #638BBD

Color Lab

Pairs with #638BBD

UI roles & guardrails

In real applications

Scales

Every model

Export