What color is #3F3C80?

#3F3C80 is a dark blue-violet. In RGB it is rgb(63, 60, 128), and in HSL hsl(243, 36%, 37%).

Is #3F3C80 accessible as text?

On white, #3F3C80 has a contrast ratio of 9.68:1 (passes WCAG AA for body text); on black it is 2.17:1 (fails). For text placed on #3F3C80, use white for the best readability.

What is the closest Tailwind color to #3F3C80?

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

What colors go well with #3F3C80?

#3F3C80 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #7D803C. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #3F3C80 below.

Is #3F3C80 good for buttons?

#3F3C80 works well for buttons and highlights, but use white text on #3F3C80 — black text only reaches 2.17:1, below the 4.5:1 needed for normal-size labels.

Is #3F3C80 the same as CSS darkslateblue?

No — #3F3C80 is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#3F3C80 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #3F3C80

Not just a swatch — here's how #3F3C80 works with other colors. Named schemes with #3F3C80 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #3F3C80 Accent #A5C4C3 Surface #EAD5BF Secondary #9AA0A1 Anchor #22334A

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 #3F3C80 Secondary #7F4534 Surface #EDD7C2 Accent #365247 Anchor #582238

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 #3F3C80 Anchor #3B2923 Surface #F3E1D2 Accent #759F7C 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 #3F3C80 Surface #F5E5D8 Anchor #5B2142 Accent #E5C2C9 Secondary #332B2F

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 #3F3C80 Secondary #6A6B84 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.

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Color Lab

How #3F3C80 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 30/100

Cool

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

Softness 34/100

Low

Middle-weight — neither delicate nor heavy.

Depth 61/100

High

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

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 46/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 67/100

High

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

Brand distinctiveness 30/100

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 25/100

Low

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

Print safety 84/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #3F3C80

For UI

For branding

For interior

For fashion

People also use #3F3C80 with

Teal Blue Eminence Olive Green 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 9.7:1. Use

Subtle surface Use #D7D7E7 for cards and hover fills. Tint 80

Avoid beside #563C80 — 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 #3F3C80 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: #3F3C80;
  --color-base-rgb: 63 60 128;
  --color-base-oklch: oklch(39.6% 0.111 282.0);
  --color-50: #F5F4FA;
  --color-100: #E4E3F2;
  --color-200: #C9C8E5;
  --color-300: #A3A0CF;
  --color-400: #7E7BB7;
  --color-500: #5E5B9A;
  --color-600: #4D4A77;
  --color-700: #3A3956;
  --color-800: #292839;
  --color-900: #1A1A23;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  dark-slate-blue: {
    50: '#F5F4FA',
    100: '#E4E3F2',
    200: '#C9C8E5',
    300: '#A3A0CF',
    400: '#7E7BB7',
    500: '#5E5B9A',
    600: '#4D4A77',
    700: '#3A3956',
    800: '#292839',
    900: '#1A1A23',
  },
}

$base: #3F3C80;
$base-ink: #FFFFFF;
$base-50: #F5F4FA;
$base-100: #E4E3F2;
$base-200: #C9C8E5;
$base-300: #A3A0CF;
$base-400: #7E7BB7;
$base-500: #5E5B9A;
$base-600: #4D4A77;
$base-700: #3A3956;
$base-800: #292839;
$base-900: #1A1A23;
$base-hover: #333067;
$base-subtle: #C3C2DC;

{
    "color": {
        "base": {
            "value": "#3F3C80",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F4FA",
                "type": "color"
            },
            "100": {
                "value": "#E4E3F2",
                "type": "color"
            },
            "200": {
                "value": "#C9C8E5",
                "type": "color"
            },
            "300": {
                "value": "#A3A0CF",
                "type": "color"
            },
            "400": {
                "value": "#7E7BB7",
                "type": "color"
            },
            "500": {
                "value": "#5E5B9A",
                "type": "color"
            },
            "600": {
                "value": "#4D4A77",
                "type": "color"
            },
            "700": {
                "value": "#3A3956",
                "type": "color"
            },
            "800": {
                "value": "#292839",
                "type": "color"
            },
            "900": {
                "value": "#1A1A23",
                "type": "color"
            }
        }
    }
}

Palettes built on #3F3C80

Color Lab

Pairs with #3F3C80

UI roles & guardrails

In real applications

Scales

Every model

Export