What color is #6591BD?

#6591BD is a medium blue. In RGB it is rgb(101, 145, 189), and in HSL hsl(210, 40%, 57%).

Is #6591BD accessible as text?

On white, #6591BD has a contrast ratio of 3.31:1 (fails WCAG AA for body text); on black it is 6.34:1 (passes). For text placed on #6591BD, use black for the best readability.

What is the closest Tailwind color to #6591BD?

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

What colors go well with #6591BD?

#6591BD pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #BD9165. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #6591BD below.

Is #6591BD good for buttons?

#6591BD works well for buttons and highlights, but use black text on #6591BD — white text only reaches 3.31:1, below the 4.5:1 needed for normal-size labels.

Is #6591BD the same as CSS lightslategray?

No — #6591BD is not the CSS named color lightslategray, but lightslategray (#778899) is the closest CSS named color by perceptual color distance — it sits in a different color family, so treat it as a rough reference, not a match.

#6591BD Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #6591BD

Not just a swatch — here's how #6591BD works with other colors. Named schemes with #6591BD in its natural role, and a note on why the supporting colors balance it.

Nordic Calm Accent · 5 colors

Accent #6591BD Secondary #AEB4B8 Surface #F1F2F0 Support #7C93A6 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 #6591BD 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 #6591BD Surface #ECEADC 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 #6591BD Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #8EB6DF

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 #6591BD Secondary #ABBACA Support #959386 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 #6591BD 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 27/100

Cool

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

Softness 56/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 35/100

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 51/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 42/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 32/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 70/100

High

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

Surface fit 41/100

Moderate

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 #6591BD

For UI

For branding

For interior

For fashion

People also use #6591BD with

Medium Turquoise Very Peri 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 5.6:1. Use

Subtle surface Use #E3E9EF for cards and hover fills. Tint 80

Avoid beside #6574BD — 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 #6591BD 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: #6591BD;
  --color-base-rgb: 101 145 189;
  --color-base-oklch: oklch(64.2% 0.082 249.2);
  --color-50: #F4F7FB;
  --color-100: #E2EBF3;
  --color-200: #C6D6E6;
  --color-300: #9EB8D1;
  --color-400: #7899BA;
  --color-500: #577A9E;
  --color-600: #48617A;
  --color-700: #374758;
  --color-800: #27303A;
  --color-900: #191F24;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  ocean-blue: {
    50: '#F4F7FB',
    100: '#E2EBF3',
    200: '#C6D6E6',
    300: '#9EB8D1',
    400: '#7899BA',
    500: '#577A9E',
    600: '#48617A',
    700: '#374758',
    800: '#27303A',
    900: '#191F24',
  },
}

$base: #6591BD;
$base-ink: #141310;
$base-50: #F4F7FB;
$base-100: #E2EBF3;
$base-200: #C6D6E6;
$base-300: #9EB8D1;
$base-400: #7899BA;
$base-500: #577A9E;
$base-600: #48617A;
$base-700: #374758;
$base-800: #27303A;
$base-900: #191F24;
$base-hover: #4674A3;
$base-subtle: #D4DEE8;

{
    "color": {
        "base": {
            "value": "#6591BD",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F7FB",
                "type": "color"
            },
            "100": {
                "value": "#E2EBF3",
                "type": "color"
            },
            "200": {
                "value": "#C6D6E6",
                "type": "color"
            },
            "300": {
                "value": "#9EB8D1",
                "type": "color"
            },
            "400": {
                "value": "#7899BA",
                "type": "color"
            },
            "500": {
                "value": "#577A9E",
                "type": "color"
            },
            "600": {
                "value": "#48617A",
                "type": "color"
            },
            "700": {
                "value": "#374758",
                "type": "color"
            },
            "800": {
                "value": "#27303A",
                "type": "color"
            },
            "900": {
                "value": "#191F24",
                "type": "color"
            }
        }
    }
}

Palettes built on #6591BD

Color Lab

Pairs with #6591BD

UI roles & guardrails

In real applications

Scales

Every model

Export