What color is #513ECF?

#513ECF is a medium indigo. In RGB it is rgb(81, 62, 207), and in HSL hsl(248, 60%, 53%).

Is #513ECF accessible as text?

On white, #513ECF has a contrast ratio of 7.14:1 (passes WCAG AA for body text); on black it is 2.94:1 (fails). For text placed on #513ECF, use white for the best readability.

What is the closest Tailwind color to #513ECF?

The nearest Tailwind CSS token is indigo-700 (#432DD7).

What colors go well with #513ECF?

#513ECF pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #BCCF3F. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #513ECF below.

Is #513ECF good for buttons?

#513ECF works well for buttons and highlights, but use white text on #513ECF — black text only reaches 2.94:1, below the 4.5:1 needed for normal-size labels.

Is #513ECF the same as CSS slateblue?

No — #513ECF is not the CSS named color slateblue, but slateblue (#6A5ACD) is the closest CSS named color.

#513ECF Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #513ECF

Not just a swatch — here's how #513ECF works with other colors. Named schemes with #513ECF in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #513ECF Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #706BED

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

Berry & Cream Lead · 5 colors

Lead #513ECF Surface #F5E5D8 Anchor #5B2142 Accent #E5C2C9 Secondary #322B2F

Cerulean 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 #513ECF Secondary #7E81B2 Support #9D9088 Ink #18140F

Cerulean 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 Cerulean carrying the quiet middle.

Coastal Morning Lead · 5 colors

Lead #513ECF Accent #A5C4C3 Surface #EAD5BF Secondary #9AA0A1 Anchor #22334A

Cerulean 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 #513ECF Secondary #E86A70 Accent #F5934D Anchor #583B57 Surface #F7E7D7

Cerulean 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 #513ECF 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 18/100

Cool

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

Softness 30/100

Low

Firm and assertive — carries weight and contrast.

Depth 56/100

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 20/100

Low

Clean and current — no dusty, aged cast.

Luxury 52/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 82/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 78/100

High

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

Surface fit 9/100

Very low

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

Print safety 68/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #513ECF

For UI

For branding

For interior

For fashion

People also use #513ECF with

Cornflower Blue Dark Orchid Yellow 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 7.1:1. Use

Subtle surface Use #DFDDF1 for cards and hover fills. Tint 80

Avoid beside #823FCF — 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 #513ECF 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: #513ECF;
  --color-base-rgb: 81 62 207;
  --color-base-oklch: oklch(48.0% 0.212 280.8);
  --color-50: #F4F2FC;
  --color-100: #E1DEF8;
  --color-200: #C4BEEF;
  --color-300: #9B91DE;
  --color-400: #7567CB;
  --color-500: #5446AF;
  --color-600: #463C86;
  --color-700: #362F60;
  --color-800: #26223F;
  --color-900: #191627;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  cerulean: {
    50: '#F4F2FC',
    100: '#E1DEF8',
    200: '#C4BEEF',
    300: '#9B91DE',
    400: '#7567CB',
    500: '#5446AF',
    600: '#463C86',
    700: '#362F60',
    800: '#26223F',
    900: '#191627',
  },
}

$base: #513ECF;
$base-ink: #FFFFFF;
$base-50: #F4F2FC;
$base-100: #E1DEF8;
$base-200: #C4BEEF;
$base-300: #9B91DE;
$base-400: #7567CB;
$base-500: #5446AF;
$base-600: #463C86;
$base-700: #362F60;
$base-800: #26223F;
$base-900: #191627;
$base-hover: #3D2BAD;
$base-subtle: #CFCBEB;

{
    "color": {
        "base": {
            "value": "#513ECF",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F2FC",
                "type": "color"
            },
            "100": {
                "value": "#E1DEF8",
                "type": "color"
            },
            "200": {
                "value": "#C4BEEF",
                "type": "color"
            },
            "300": {
                "value": "#9B91DE",
                "type": "color"
            },
            "400": {
                "value": "#7567CB",
                "type": "color"
            },
            "500": {
                "value": "#5446AF",
                "type": "color"
            },
            "600": {
                "value": "#463C86",
                "type": "color"
            },
            "700": {
                "value": "#362F60",
                "type": "color"
            },
            "800": {
                "value": "#26223F",
                "type": "color"
            },
            "900": {
                "value": "#191627",
                "type": "color"
            }
        }
    }
}