What color is #216366?

#216366 is a dark cyan. In RGB it is rgb(33, 99, 102), and in HSL hsl(183, 51%, 26%).

Is #216366 accessible as text?

On white, #216366 has a contrast ratio of 6.91:1 (passes WCAG AA for body text); on black it is 3.04:1 (fails). For text placed on #216366, use white for the best readability.

What is the closest Tailwind color to #216366?

The nearest Tailwind CSS token is teal-800 (#005F5A).

What colors go well with #216366?

#216366 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #642420. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #216366 below.

Is #216366 good for buttons?

#216366 works well for buttons and highlights, but use white text on #216366 — black text only reaches 3.04:1, below the 4.5:1 needed for normal-size labels.

Is #216366 the same as CSS darkslategray?

No — #216366 is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#216366 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #216366

Not just a swatch — here's how #216366 works with other colors. Named schemes with #216366 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #216366 Accent #A6C4BD Surface #DFDABE Secondary #9AA0A0 Anchor #1D3549

Feldgrau 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 #216366 Secondary #AEB4B8 Surface #F1F2F0 Support #7A94A5 Anchor #2E3236

Feldgrau keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.

Vintage Leather Lead · 5 colors

Lead #216366 Secondary #715017 Surface #E3DCC0 Accent #395143 Anchor #552340

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

Modern Café Dominant · 5 colors

Dominant #216366 Anchor #382C1D Surface #EBE4D0 Accent #809D72 Secondary #3A3933

Feldgrau 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.

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #216366 Secondary #718585 Support #979286 Ink #16140F

Feldgrau 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 Feldgrau carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #216366 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 33/100

Cool

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

Softness 43/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 52/100

Moderate

Mid depth — usable as an accent or a muted ground.

Naturalness 9/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 47/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 58/100

Moderate

Restrained and premium — deep, quiet, high-end packaging and fashion.

Brand distinctiveness 25/100

Low

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

UI accent fit 73/100

High

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

Surface fit 35/100

Low

Usable as a tinted surface in measured doses.

Print safety 83/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #216366

For UI

For branding

For interior

For fashion

People also use #216366 with

Sea Green Yale Blue Wine Red Platinum Dark Slate Gray

UI roles & guardrails

Primary action Safe as a filled button with white label. AA

Body text Passes on white at 16px and above. Pass

Large display Fine for headings 24px+ on white. Pass

Background Pair with white text at 6.9:1. Use

Subtle surface Use #CBE6E7 for cards and hover fills. Tint 80

Avoid beside #204A64 — 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 #216366 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: #216366;
  --color-base-rgb: 33 99 102;
  --color-base-oklch: oklch(46.0% 0.065 199.4);
  --color-50: #F3FBFC;
  --color-100: #E0F5F6;
  --color-200: #C1E9EB;
  --color-300: #97D5D9;
  --color-400: #6FBFC3;
  --color-500: #4EA3A7;
  --color-600: #417D81;
  --color-700: #335A5C;
  --color-800: #243B3D;
  --color-900: #182526;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  feldgrau: {
    50: '#F3FBFC',
    100: '#E0F5F6',
    200: '#C1E9EB',
    300: '#97D5D9',
    400: '#6FBFC3',
    500: '#4EA3A7',
    600: '#417D81',
    700: '#335A5C',
    800: '#243B3D',
    900: '#182526',
  },
}

$base: #216366;
$base-ink: #FFFFFF;
$base-50: #F3FBFC;
$base-100: #E0F5F6;
$base-200: #C1E9EB;
$base-300: #97D5D9;
$base-400: #6FBFC3;
$base-500: #4EA3A7;
$base-600: #417D81;
$base-700: #335A5C;
$base-800: #243B3D;
$base-900: #182526;
$base-hover: #1A4D50;
$base-subtle: #B0DADC;

{
    "color": {
        "base": {
            "value": "#216366",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3FBFC",
                "type": "color"
            },
            "100": {
                "value": "#E0F5F6",
                "type": "color"
            },
            "200": {
                "value": "#C1E9EB",
                "type": "color"
            },
            "300": {
                "value": "#97D5D9",
                "type": "color"
            },
            "400": {
                "value": "#6FBFC3",
                "type": "color"
            },
            "500": {
                "value": "#4EA3A7",
                "type": "color"
            },
            "600": {
                "value": "#417D81",
                "type": "color"
            },
            "700": {
                "value": "#335A5C",
                "type": "color"
            },
            "800": {
                "value": "#243B3D",
                "type": "color"
            },
            "900": {
                "value": "#182526",
                "type": "color"
            }
        }
    }
}

Palettes built on #216366

Color Lab

Pairs with #216366

UI roles & guardrails

In real applications

Scales

Every model

Export