What color is #375AA4?

#375AA4 is a medium blue. In RGB it is rgb(55, 90, 164), and in HSL hsl(221, 50%, 43%).

Is #375AA4 accessible as text?

On white, #375AA4 has a contrast ratio of 6.64:1 (passes WCAG AA for body text); on black it is 3.16:1 (fails). For text placed on #375AA4, use white for the best readability.

What is the closest Tailwind color to #375AA4?

The nearest Tailwind CSS token is sky-700 (#0069A8).

What colors go well with #375AA4?

#375AA4 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #A48237. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #375AA4 below.

Is #375AA4 good for buttons?

#375AA4 works well for buttons and highlights, but use white text on #375AA4 — black text only reaches 3.16:1, below the 4.5:1 needed for normal-size labels.

Is #375AA4 the same as CSS darkslateblue?

No — #375AA4 is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#375AA4 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #375AA4

Not just a swatch — here's how #375AA4 works with other colors. Named schemes with #375AA4 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #375AA4 Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

Lapis Lazuli 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 #375AA4 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #5C7FC4

Lapis Lazuli is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Lapis Lazuli.

Vintage Leather Lead · 5 colors

Lead #375AA4 Secondary #7F4536 Surface #EED7C2 Accent #375246 Anchor #57223A

Lapis Lazuli 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 #375AA4 Surface #F6E5D8 Anchor #5B2144 Accent #E4C2CA Secondary #322B2F

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

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #375AA4 Secondary #7987A2 Support #9D8F88 Ink #18140F

Lapis Lazuli 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 Lapis Lazuli carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #375AA4 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 19/100

Cool

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

Softness 38/100

Low

Middle-weight — neither delicate nor heavy.

Depth 53/100

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 45/100

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 34/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 95/100

Very high

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

Surface fit 15/100

Very 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 #375AA4

For UI

For branding

For interior

For fashion

People also use #375AA4 with

Verdigris Rebecca Purple Dark Goldenrod Gainsboro 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 6.6:1. Use

Subtle surface Use #D7DEEC for cards and hover fills. Tint 80

Avoid beside #3937A4 — 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 #375AA4 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: #375AA4;
  --color-base-rgb: 55 90 164;
  --color-base-oklch: oklch(48.0% 0.126 263.4);
  --color-50: #F3F6FC;
  --color-100: #E0E7F5;
  --color-200: #C2CFEB;
  --color-300: #97ACD8;
  --color-400: #708AC2;
  --color-500: #4E6AA6;
  --color-600: #425580;
  --color-700: #33405C;
  --color-800: #242C3C;
  --color-900: #181C25;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  lapis-lazuli: {
    50: '#F3F6FC',
    100: '#E0E7F5',
    200: '#C2CFEB',
    300: '#97ACD8',
    400: '#708AC2',
    500: '#4E6AA6',
    600: '#425580',
    700: '#33405C',
    800: '#242C3C',
    900: '#181C25',
  },
}

$base: #375AA4;
$base-ink: #FFFFFF;
$base-50: #F3F6FC;
$base-100: #E0E7F5;
$base-200: #C2CFEB;
$base-300: #97ACD8;
$base-400: #708AC2;
$base-500: #4E6AA6;
$base-600: #425580;
$base-700: #33405C;
$base-800: #242C3C;
$base-900: #181C25;
$base-hover: #2C4884;
$base-subtle: #C3CDE4;

{
    "color": {
        "base": {
            "value": "#375AA4",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F6FC",
                "type": "color"
            },
            "100": {
                "value": "#E0E7F5",
                "type": "color"
            },
            "200": {
                "value": "#C2CFEB",
                "type": "color"
            },
            "300": {
                "value": "#97ACD8",
                "type": "color"
            },
            "400": {
                "value": "#708AC2",
                "type": "color"
            },
            "500": {
                "value": "#4E6AA6",
                "type": "color"
            },
            "600": {
                "value": "#425580",
                "type": "color"
            },
            "700": {
                "value": "#33405C",
                "type": "color"
            },
            "800": {
                "value": "#242C3C",
                "type": "color"
            },
            "900": {
                "value": "#181C25",
                "type": "color"
            }
        }
    }
}

Palettes built on #375AA4

Color Lab

Pairs with #375AA4

UI roles & guardrails

In real applications

Scales

Every model

Export