What color is #5151DE?

#5151DE is a medium blue-violet. In RGB it is rgb(81, 81, 222), and in HSL hsl(240, 68%, 59%).

Is #5151DE accessible as text?

On white, #5151DE has a contrast ratio of 5.86:1 (passes WCAG AA for body text); on black it is 3.58:1 (fails). For text placed on #5151DE, use white for the best readability.

What is the closest Tailwind color to #5151DE?

The nearest Tailwind CSS token is indigo-600 (#4F39F6).

What colors go well with #5151DE?

#5151DE pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #DEDE4F. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #5151DE below.

Is #5151DE good for buttons?

#5151DE works well for buttons and highlights, but use white text on #5151DE — black text only reaches 3.58:1, below the 4.5:1 needed for normal-size labels.

Is #5151DE the same as CSS slateblue?

No — #5151DE is not the CSS named color slateblue, but slateblue (#6A5ACD) is the closest CSS named color.

#5151DE Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #5151DE

Not just a swatch — here's how #5151DE works with other colors. Named schemes with #5151DE in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #5151DE Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #727CFC

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

Berry & Cream Lead · 5 colors

Lead #5151DE Surface #F6E5D8 Anchor #5B2143 Accent #E5C2C9 Secondary #322B2F

Iris 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 #5151DE Secondary #878FC0 Support #9D9088 Ink #18140F

Iris 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 Iris carrying the quiet middle.

Coastal Morning Lead · 5 colors

Lead #5151DE Accent #A5C4C2 Surface #EAD5BF Secondary #9AA0A1 Anchor #21344A

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

Sunset Warmth Glow · 5 colors

Glow #5151DE Secondary #E86A72 Accent #F6924E Anchor #583B57 Surface #F7E7D7

Iris glows at the center of this sunset palette, joined by coral and gold, deepened by a plum anchor and cooled with cream.

Build a working theme in the generator →

Color Lab

How #5151DE 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 16/100

Cool

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

Softness 32/100

Low

Middle-weight — neither delicate nor heavy.

Depth 51/100

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 22/100

Low

Clean and current — no dusty, aged cast.

Luxury 49/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 81/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 83/100

Very high

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

Surface fit 10/100

Very low

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

Print safety 67/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #5151DE

For UI

For branding

For interior

For fashion

People also use #5151DE with

Picton Blue Medium Orchid Pear Gainsboro Prussian Blue

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 5.9:1. Use

Subtle surface Use #E0E0F4 for cards and hover fills. Tint 80

Avoid beside #7F4FDE — 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 #5151DE 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: #5151DE;
  --color-base-rgb: 81 81 222;
  --color-base-oklch: oklch(52.3% 0.209 276.4);
  --color-50: #F2F2FD;
  --color-100: #DCDCF9;
  --color-200: #BBBBF2;
  --color-300: #8C8CE3;
  --color-400: #6161D1;
  --color-500: #3F3FB6;
  --color-600: #37378B;
  --color-700: #2C2C63;
  --color-800: #202041;
  --color-900: #151528;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  iris: {
    50: '#F2F2FD',
    100: '#DCDCF9',
    200: '#BBBBF2',
    300: '#8C8CE3',
    400: '#6161D1',
    500: '#3F3FB6',
    600: '#37378B',
    700: '#2C2C63',
    800: '#202041',
    900: '#151528',
  },
}

$base: #5151DE;
$base-ink: #FFFFFF;
$base-50: #F2F2FD;
$base-100: #DCDCF9;
$base-200: #BBBBF2;
$base-300: #8C8CE3;
$base-400: #6161D1;
$base-500: #3F3FB6;
$base-600: #37378B;
$base-700: #2C2C63;
$base-800: #202041;
$base-900: #151528;
$base-hover: #2727CA;
$base-subtle: #CFCFF0;

{
    "color": {
        "base": {
            "value": "#5151DE",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F2FD",
                "type": "color"
            },
            "100": {
                "value": "#DCDCF9",
                "type": "color"
            },
            "200": {
                "value": "#BBBBF2",
                "type": "color"
            },
            "300": {
                "value": "#8C8CE3",
                "type": "color"
            },
            "400": {
                "value": "#6161D1",
                "type": "color"
            },
            "500": {
                "value": "#3F3FB6",
                "type": "color"
            },
            "600": {
                "value": "#37378B",
                "type": "color"
            },
            "700": {
                "value": "#2C2C63",
                "type": "color"
            },
            "800": {
                "value": "#202041",
                "type": "color"
            },
            "900": {
                "value": "#151528",
                "type": "color"
            }
        }
    }
}