What color is #3787D7?

#3787D7 is a medium blue. In RGB it is rgb(55, 135, 215), and in HSL hsl(210, 67%, 53%).

Is #3787D7 accessible as text?

On white, #3787D7 has a contrast ratio of 3.74:1 (fails WCAG AA for body text); on black it is 5.61:1 (passes). For text placed on #3787D7, use black for the best readability.

What is the closest Tailwind color to #3787D7?

The nearest Tailwind CSS token is sky-600 (#0084D1).

What colors go well with #3787D7?

#3787D7 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #D78737. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #3787D7 below.

Is #3787D7 good for buttons?

#3787D7 works well for buttons and highlights, but use black text on #3787D7 — white text only reaches 3.74:1, below the 4.5:1 needed for normal-size labels.

Is #3787D7 the same as CSS steelblue?

No — #3787D7 is not the CSS named color steelblue, but steelblue (#4682B4) is the closest CSS named color.

#3787D7 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #3787D7

Not just a swatch — here's how #3787D7 works with other colors. Named schemes with #3787D7 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #3787D7 Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

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 #3787D7 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #67ADF7

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 #3787D7 Secondary #7F4537 Surface #E1DDC0 Accent #375245 Anchor #57233B

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 #3787D7 Surface #EDE9D6 Anchor #5A2145 Accent #E4C2CB Secondary #322B2F

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 #3787D7 Secondary #98B2CF Support #959386 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 #3787D7 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 10/100

Cool

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

Softness 46/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 40/100

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 39/100

Low

A faint retro warmth without tipping into sepia.

Luxury 45/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 39/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 89/100

Very high

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

Surface fit 19/100

Very low

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

Print safety 69/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #3787D7

For UI

For branding

For interior

For fashion

People also use #3787D7 with

Turquoise Han Purple Peru 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 5.0:1. Use

Subtle surface Use #DBE7F3 for cards and hover fills. Tint 80

Avoid beside #3752D7 — 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 #3787D7 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: #3787D7;
  --color-base-rgb: 55 135 215;
  --color-base-oklch: oklch(61.3% 0.144 251.4);
  --color-50: #F2F7FD;
  --color-100: #DCEBF9;
  --color-200: #BBD6F1;
  --color-300: #8CB8E3;
  --color-400: #6299D0;
  --color-500: #3F7AB5;
  --color-600: #37618B;
  --color-700: #2C4762;
  --color-800: #203041;
  --color-900: #161F28;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  steel-blue: {
    50: '#F2F7FD',
    100: '#DCEBF9',
    200: '#BBD6F1',
    300: '#8CB8E3',
    400: '#6299D0',
    500: '#3F7AB5',
    600: '#37618B',
    700: '#2C4762',
    800: '#203041',
    900: '#161F28',
  },
}

$base: #3787D7;
$base-ink: #141310;
$base-50: #F2F7FD;
$base-100: #DCEBF9;
$base-200: #BBD6F1;
$base-300: #8CB8E3;
$base-400: #6299D0;
$base-500: #3F7AB5;
$base-600: #37618B;
$base-700: #2C4762;
$base-800: #203041;
$base-900: #161F28;
$base-hover: #246CB5;
$base-subtle: #C9DBED;

{
    "color": {
        "base": {
            "value": "#3787D7",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F7FD",
                "type": "color"
            },
            "100": {
                "value": "#DCEBF9",
                "type": "color"
            },
            "200": {
                "value": "#BBD6F1",
                "type": "color"
            },
            "300": {
                "value": "#8CB8E3",
                "type": "color"
            },
            "400": {
                "value": "#6299D0",
                "type": "color"
            },
            "500": {
                "value": "#3F7AB5",
                "type": "color"
            },
            "600": {
                "value": "#37618B",
                "type": "color"
            },
            "700": {
                "value": "#2C4762",
                "type": "color"
            },
            "800": {
                "value": "#203041",
                "type": "color"
            },
            "900": {
                "value": "#161F28",
                "type": "color"
            }
        }
    }
}