What color is #618CA4?

#618CA4 is a medium, muted cyan-blue. In RGB it is rgb(97, 140, 164), and in HSL hsl(201, 27%, 51%).

Is #618CA4 accessible as text?

On white, #618CA4 has a contrast ratio of 3.62:1 (fails WCAG AA for body text); on black it is 5.80:1 (passes). For text placed on #618CA4, use black for the best readability.

What is the closest Tailwind color to #618CA4?

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

What colors go well with #618CA4?

#618CA4 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #A47860. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #618CA4 below.

Is #618CA4 good for buttons?

#618CA4 works well for buttons and highlights, but use black text on #618CA4 — white text only reaches 3.62:1, below the 4.5:1 needed for normal-size labels.

Is #618CA4 the same as CSS lightslategray?

No — #618CA4 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.

#618CA4 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #618CA4

Not just a swatch — here's how #618CA4 works with other colors. Named schemes with #618CA4 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #618CA4 Accent #A6C4C0 Surface #DEDABF Secondary #9AA0A0 Anchor #1F344A

Air Force 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 #618CA4 Secondary #AEB4B8 Surface #F1F2F0 Support #7B93A6 Anchor #2E3236

Air Force 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 #618CA4 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #89B0C7

Air Force 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 Air Force Blue.

Vintage Leather Lead · 5 colors

Lead #618CA4 Secondary #6F5216 Surface #E2DCC0 Accent #385244 Anchor #57233D

Air Force Blue 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 #F6F4EF Accent #618CA4 Secondary #A4B3BC Support #969386 Ink #16140F

Air Force 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 Air Force Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #618CA4 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 32/100

Cool

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

Softness 57/100

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 45/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 43/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 23/100

Low

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

UI accent fit 67/100

High

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

Surface fit 46/100

Moderate

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 #618CA4

For UI

For branding

For interior

For fashion

People also use #618CA4 with

Verdigris Very Peri Mocha Platinum 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 5.1:1. Use

Subtle surface Use #E1E7EB for cards and hover fills. Tint 80

Avoid beside #6076A4 — 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 #618CA4 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: #618CA4;
  --color-base-rgb: 97 140 164;
  --color-base-oklch: oklch(61.8% 0.060 233.5);
  --color-50: #F5F8FA;
  --color-100: #E5ECF0;
  --color-200: #CBD9E1;
  --color-300: #A6BDC9;
  --color-400: #83A0AF;
  --color-500: #638292;
  --color-600: #506672;
  --color-700: #3D4B52;
  --color-800: #2A3237;
  --color-900: #1B2022;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  air-force-blue: {
    50: '#F5F8FA',
    100: '#E5ECF0',
    200: '#CBD9E1',
    300: '#A6BDC9',
    400: '#83A0AF',
    500: '#638292',
    600: '#506672',
    700: '#3D4B52',
    800: '#2A3237',
    900: '#1B2022',
  },
}

$base: #618CA4;
$base-ink: #141310;
$base-50: #F5F8FA;
$base-100: #E5ECF0;
$base-200: #CBD9E1;
$base-300: #A6BDC9;
$base-400: #83A0AF;
$base-500: #638292;
$base-600: #506672;
$base-700: #3D4B52;
$base-800: #2A3237;
$base-900: #1B2022;
$base-hover: #4C7084;
$base-subtle: #D2DCE1;

{
    "color": {
        "base": {
            "value": "#618CA4",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F8FA",
                "type": "color"
            },
            "100": {
                "value": "#E5ECF0",
                "type": "color"
            },
            "200": {
                "value": "#CBD9E1",
                "type": "color"
            },
            "300": {
                "value": "#A6BDC9",
                "type": "color"
            },
            "400": {
                "value": "#83A0AF",
                "type": "color"
            },
            "500": {
                "value": "#638292",
                "type": "color"
            },
            "600": {
                "value": "#506672",
                "type": "color"
            },
            "700": {
                "value": "#3D4B52",
                "type": "color"
            },
            "800": {
                "value": "#2A3237",
                "type": "color"
            },
            "900": {
                "value": "#1B2022",
                "type": "color"
            }
        }
    }
}

Palettes built on #618CA4

Color Lab

Pairs with #618CA4

UI roles & guardrails

In real applications

Scales

Every model

Export