What color is #39378B?

#39378B is a dark blue-violet. In RGB it is rgb(57, 55, 139), and in HSL hsl(241, 43%, 38%).

Is #39378B accessible as text?

On white, #39378B has a contrast ratio of 10.03:1 (passes WCAG AA for body text); on black it is 2.09:1 (fails). For text placed on #39378B, use white for the best readability.

What is the closest Tailwind color to #39378B?

The nearest Tailwind CSS token is indigo-900 (#312C85).

What colors go well with #39378B?

#39378B pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #898B37. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #39378B below.

Is #39378B good for buttons?

#39378B works well for buttons and highlights, but use white text on #39378B — black text only reaches 2.09:1, below the 4.5:1 needed for normal-size labels.

Is #39378B the same as CSS darkslateblue?

No — #39378B is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#39378B Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #39378B

Not just a swatch — here's how #39378B works with other colors. Named schemes with #39378B in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #39378B Accent #A5C4C2 Surface #EAD5BF Secondary #9AA0A1 Anchor #22344A

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

Vintage Leather Lead · 5 colors

Lead #39378B Secondary #7F4534 Surface #EDD7C2 Accent #365247 Anchor #582239

Dark Slate 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.

Modern Café Dominant · 5 colors

Dominant #39378B Anchor #3B2923 Surface #F3E1D2 Accent #769F7B Secondary #3C3734

Dark Slate Blue 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.

Berry & Cream Lead · 5 colors

Lead #39378B Surface #F6E5D8 Anchor #5B2142 Accent #E5C2C9 Secondary #322B2F

Dark Slate Blue 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 #39378B Secondary #666988 Support #9D9088 Ink #18140F

Dark Slate 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 Dark Slate Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #39378B 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 24/100

Cool

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

Softness 31/100

Low

Firm and assertive — carries weight and contrast.

Depth 62/100

High

Deep and grounding — anchors a layout, strong dark-mode base.

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 38/100

Low

A faint retro warmth without tipping into sepia.

Luxury 65/100

High

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

Brand distinctiveness 37/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 71/100

High

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

Surface fit 18/100

Very low

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

Print safety 79/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #39378B

For UI

For branding

For interior

For fashion

People also use #39378B with

Steel Blue Eminence Olive Gainsboro Prussian Blue

UI roles & guardrails

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

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 10.0:1. Use

Subtle surface Use #D6D6E9 for cards and hover fills. Tint 80

Avoid beside #54378B — 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 #39378B 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: #39378B;
  --color-base-rgb: 57 55 139;
  --color-base-oklch: oklch(39.0% 0.136 279.1);
  --color-50: #F4F4FB;
  --color-100: #E2E1F4;
  --color-200: #C5C5E8;
  --color-300: #9D9CD3;
  --color-400: #7775BD;
  --color-500: #5655A0;
  --color-600: #47467C;
  --color-700: #373659;
  --color-800: #26263B;
  --color-900: #191924;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  dark-slate-blue: {
    50: '#F4F4FB',
    100: '#E2E1F4',
    200: '#C5C5E8',
    300: '#9D9CD3',
    400: '#7775BD',
    500: '#5655A0',
    600: '#47467C',
    700: '#373659',
    800: '#26263B',
    900: '#191924',
  },
}

$base: #39378B;
$base-ink: #FFFFFF;
$base-50: #F4F4FB;
$base-100: #E2E1F4;
$base-200: #C5C5E8;
$base-300: #9D9CD3;
$base-400: #7775BD;
$base-500: #5655A0;
$base-600: #47467C;
$base-700: #373659;
$base-800: #26263B;
$base-900: #191924;
$base-hover: #2D2C6F;
$base-subtle: #C1C0DF;

{
    "color": {
        "base": {
            "value": "#39378B",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F4FB",
                "type": "color"
            },
            "100": {
                "value": "#E2E1F4",
                "type": "color"
            },
            "200": {
                "value": "#C5C5E8",
                "type": "color"
            },
            "300": {
                "value": "#9D9CD3",
                "type": "color"
            },
            "400": {
                "value": "#7775BD",
                "type": "color"
            },
            "500": {
                "value": "#5655A0",
                "type": "color"
            },
            "600": {
                "value": "#47467C",
                "type": "color"
            },
            "700": {
                "value": "#373659",
                "type": "color"
            },
            "800": {
                "value": "#26263B",
                "type": "color"
            },
            "900": {
                "value": "#191924",
                "type": "color"
            }
        }
    }
}

Palettes built on #39378B

Color Lab

Pairs with #39378B

UI roles & guardrails

In real applications

Scales

Every model

Export