What color is #337AA3?

#337AA3 is a medium cyan-blue. In RGB it is rgb(51, 122, 163), and in HSL hsl(202, 52%, 42%).

Is #337AA3 accessible as text?

On white, #337AA3 has a contrast ratio of 4.72:1 (passes WCAG AA for body text); on black it is 4.45:1 (fails). For text placed on #337AA3, use white for the best readability.

What is the closest Tailwind color to #337AA3?

The nearest Tailwind CSS token is cyan-700 (#007595).

What colors go well with #337AA3?

#337AA3 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #A35C33. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #337AA3 below.

Is #337AA3 good for buttons?

#337AA3 works well for buttons and highlights, but use white text on #337AA3 — black text only reaches 4.45:1, below the 4.5:1 needed for normal-size labels.

Is #337AA3 the same as CSS steelblue?

No — #337AA3 is not the CSS named color steelblue, but steelblue (#4682B4) is the closest CSS named color.

#337AA3 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #337AA3

Not just a swatch — here's how #337AA3 works with other colors. Named schemes with #337AA3 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #337AA3 Accent #A6C4C0 Surface #DEDABF Secondary #9AA0A0 Anchor #1F344A

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

Tech Product Signal · 5 colors

Signal #337AA3 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #619EC4

Steel 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 Steel Blue.

Vintage Leather Lead · 5 colors

Lead #337AA3 Secondary #7F4439 Surface #E2DDC0 Accent #385245 Anchor #57233C

Steel 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.

Berry & Cream Lead · 5 colors

Lead #337AA3 Surface #EEE9D6 Anchor #592246 Accent #E4C2CC Secondary #322B30

Steel Blue sits between cream and a deep berry here, softened by a blush accent and grounded by charcoal.

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #337AA3 Secondary #8AA0AF Support #969386 Ink #16140F

Steel 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 Steel Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #337AA3 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 22/100

Cool

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

Softness 47/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 44/100

Moderate

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

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 58/100

Moderate

Faded, nostalgic quality — editorial, heritage and retro work.

Luxury 51/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 26/100

Low

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

UI accent fit 91/100

Very high

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

Surface fit 29/100

Low

Too saturated or mid-toned for big areas — keep it to accents.

Print safety 77/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #337AA3

For UI

For branding

For interior

For fashion

People also use #337AA3 with

Tiffany Blue Egyptian Blue Sienna Platinum Charcoal

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 4.7:1. Use

Subtle surface Use #D6E4EC for cards and hover fills. Tint 80

Avoid beside #3355A3 — 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 #337AA3 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: #337AA3;
  --color-base-rgb: 51 122 163;
  --color-base-oklch: oklch(55.3% 0.095 237.4);
  --color-50: #F3F9FC;
  --color-100: #DFEEF6;
  --color-200: #C1DCEB;
  --color-300: #96C1D9;
  --color-400: #6EA4C4;
  --color-500: #4D87A8;
  --color-600: #416A81;
  --color-700: #324D5C;
  --color-800: #24343D;
  --color-900: #182026;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  steel-blue: {
    50: '#F3F9FC',
    100: '#DFEEF6',
    200: '#C1DCEB',
    300: '#96C1D9',
    400: '#6EA4C4',
    500: '#4D87A8',
    600: '#416A81',
    700: '#324D5C',
    800: '#24343D',
    900: '#182026',
  },
}

$base: #337AA3;
$base-ink: #FFFFFF;
$base-50: #F3F9FC;
$base-100: #DFEEF6;
$base-200: #C1DCEB;
$base-300: #96C1D9;
$base-400: #6EA4C4;
$base-500: #4D87A8;
$base-600: #416A81;
$base-700: #324D5C;
$base-800: #24343D;
$base-900: #182026;
$base-hover: #296282;
$base-subtle: #C1D7E4;

{
    "color": {
        "base": {
            "value": "#337AA3",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F9FC",
                "type": "color"
            },
            "100": {
                "value": "#DFEEF6",
                "type": "color"
            },
            "200": {
                "value": "#C1DCEB",
                "type": "color"
            },
            "300": {
                "value": "#96C1D9",
                "type": "color"
            },
            "400": {
                "value": "#6EA4C4",
                "type": "color"
            },
            "500": {
                "value": "#4D87A8",
                "type": "color"
            },
            "600": {
                "value": "#416A81",
                "type": "color"
            },
            "700": {
                "value": "#324D5C",
                "type": "color"
            },
            "800": {
                "value": "#24343D",
                "type": "color"
            },
            "900": {
                "value": "#182026",
                "type": "color"
            }
        }
    }
}

Palettes built on #337AA3

Color Lab

Pairs with #337AA3

UI roles & guardrails

In real applications

Scales

Every model

Export