What color is #5B91EF?

#5B91EF is a light, vivid blue. In RGB it is rgb(91, 145, 239), and in HSL hsl(218, 82%, 65%).

Is #5B91EF accessible as text?

On white, #5B91EF has a contrast ratio of 3.12:1 (fails WCAG AA for body text); on black it is 6.74:1 (passes). For text placed on #5B91EF, use black for the best readability.

What is the closest Tailwind color to #5B91EF?

The nearest Tailwind CSS token is blue-400 (#51A2FF).

What colors go well with #5B91EF?

#5B91EF pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #EFB95D. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #5B91EF below.

Is #5B91EF good for buttons?

#5B91EF works well for buttons and highlights, but use black text on #5B91EF — white text only reaches 3.12:1, below the 4.5:1 needed for normal-size labels.

Is #5B91EF the same as CSS cornflowerblue?

No — #5B91EF is not the CSS named color cornflowerblue, but cornflowerblue (#6495ED) is the closest CSS named color.

#5B91EF Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #5B91EF

Not just a swatch — here's how #5B91EF works with other colors. Named schemes with #5B91EF in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #5B91EF Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

Cornflower 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 #5B91EF Secondary #AEB4B8 Surface #F1F2F0 Support #7D93A6 Anchor #2E3236

Cornflower 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 #5B91EF Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #85B8FF

Cornflower 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 Cornflower Blue.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #5B91EF Secondary #ABC0E2 Support #9D8F88 Ink #18140F

Cornflower 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 Cornflower Blue carrying the quiet middle.

Modern Café Dominant · 5 colors

Dominant #5B91EF Anchor #3B2924 Surface #F3E1D2 Accent #789E79 Secondary #3D3734

Cornflower 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 #5B91EF 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 11/100

Cool

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

Softness 48/100

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 34/100

Low

A faint retro warmth without tipping into sepia.

Luxury 40/100

Low

Understated — leans refined without going austere.

Brand distinctiveness 59/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 73/100

High

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

Surface fit 23/100

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 #5B91EF

For UI

For branding

For interior

For fashion

People also use #5B91EF with

Electric Blue Medium Slate Blue Burlywood 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 6.0:1. Use

Subtle surface Use #E3EAF8 for cards and hover fills. Tint 80

Avoid beside #5D61EF — 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 #5B91EF 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: #5B91EF;
  --color-base-rgb: 91 145 239;
  --color-base-oklch: oklch(66.3% 0.152 260.8);
  --color-50: #F0F6FE;
  --color-100: #D9E6FC;
  --color-200: #B5CDF8;
  --color-300: #83A9ED;
  --color-400: #5587DD;
  --color-500: #3267C3;
  --color-600: #2E5394;
  --color-700: #263F69;
  --color-800: #1D2B44;
  --color-900: #141C2A;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  cornflower-blue: {
    50: '#F0F6FE',
    100: '#D9E6FC',
    200: '#B5CDF8',
    300: '#83A9ED',
    400: '#5587DD',
    500: '#3267C3',
    600: '#2E5394',
    700: '#263F69',
    800: '#1D2B44',
    900: '#141C2A',
  },
}

$base: #5B91EF;
$base-ink: #141310;
$base-50: #F0F6FE;
$base-100: #D9E6FC;
$base-200: #B5CDF8;
$base-300: #83A9ED;
$base-400: #5587DD;
$base-500: #3267C3;
$base-600: #2E5394;
$base-700: #263F69;
$base-800: #1D2B44;
$base-900: #141C2A;
$base-hover: #206AE9;
$base-subtle: #D4E0F5;

{
    "color": {
        "base": {
            "value": "#5B91EF",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F6FE",
                "type": "color"
            },
            "100": {
                "value": "#D9E6FC",
                "type": "color"
            },
            "200": {
                "value": "#B5CDF8",
                "type": "color"
            },
            "300": {
                "value": "#83A9ED",
                "type": "color"
            },
            "400": {
                "value": "#5587DD",
                "type": "color"
            },
            "500": {
                "value": "#3267C3",
                "type": "color"
            },
            "600": {
                "value": "#2E5394",
                "type": "color"
            },
            "700": {
                "value": "#263F69",
                "type": "color"
            },
            "800": {
                "value": "#1D2B44",
                "type": "color"
            },
            "900": {
                "value": "#141C2A",
                "type": "color"
            }
        }
    }
}