What color is #515BB6?

#515BB6 is a medium blue-violet. In RGB it is rgb(81, 91, 182), and in HSL hsl(234, 41%, 52%).

Is #515BB6 accessible as text?

On white, #515BB6 has a contrast ratio of 5.96:1 (passes WCAG AA for body text); on black it is 3.52:1 (fails). For text placed on #515BB6, use white for the best readability.

What is the closest Tailwind color to #515BB6?

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

What colors go well with #515BB6?

#515BB6 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #B7AD52. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #515BB6 below.

Is #515BB6 good for buttons?

#515BB6 works well for buttons and highlights, but use white text on #515BB6 — black text only reaches 3.52:1, below the 4.5:1 needed for normal-size labels.

Is #515BB6 the same as CSS slateblue?

No — #515BB6 is not the CSS named color slateblue, but slateblue (#6A5ACD) is the closest CSS named color.

#515BB6 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #515BB6

Not just a swatch — here's how #515BB6 works with other colors. Named schemes with #515BB6 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #515BB6 Accent #A5C4C2 Surface #EAD5BF Secondary #9AA0A1 Anchor #21344A

Tanzanite 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 #515BB6 Secondary #7F4534 Surface #EED7C2 Accent #365247 Anchor #582239

Tanzanite 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 #515BB6 Anchor #3B2924 Surface #F3E1D2 Accent #769F7B Secondary #3C3734

Tanzanite 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 #515BB6 Surface #F6E5D8 Anchor #5B2143 Accent #E5C2C9 Secondary #322B2F

Tanzanite 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 #515BB6 Secondary #868DAE Support #9D9088 Ink #18140F

Tanzanite 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 Tanzanite carrying the quiet middle.

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Color Lab

How #515BB6 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 20/100

Cool

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

Softness 39/100

Low

Middle-weight — neither delicate nor heavy.

Depth 50/100

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 44/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 54/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 38/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 99/100

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 77/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #515BB6

For UI

For branding

For interior

For fashion

People also use #515BB6 with

Iceberg Royal Purple Brass 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 6.0:1. Use

Subtle surface Use #DFE1EE for cards and hover fills. Tint 80

Avoid beside #6A52B7 — 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 #515BB6 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

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Export

:root {
  --color-base: #515BB6;
  --color-base-rgb: 81 91 182;
  --color-base-oklch: oklch(51.0% 0.142 275.4);
  --color-50: #F4F5FB;
  --color-100: #E2E4F3;
  --color-200: #C6C9E7;
  --color-300: #9DA2D2;
  --color-400: #777EBB;
  --color-500: #565E9E;
  --color-600: #474C7A;
  --color-700: #373A58;
  --color-800: #27293A;
  --color-900: #191A24;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  tanzanite: {
    50: '#F4F5FB',
    100: '#E2E4F3',
    200: '#C6C9E7',
    300: '#9DA2D2',
    400: '#777EBB',
    500: '#565E9E',
    600: '#474C7A',
    700: '#373A58',
    800: '#27293A',
    900: '#191A24',
  },
}

$base: #515BB6;
$base-ink: #FFFFFF;
$base-50: #F4F5FB;
$base-100: #E2E4F3;
$base-200: #C6C9E7;
$base-300: #9DA2D2;
$base-400: #777EBB;
$base-500: #565E9E;
$base-600: #474C7A;
$base-700: #373A58;
$base-800: #27293A;
$base-900: #191A24;
$base-hover: #3F4796;
$base-subtle: #CFD1E6;

{
    "color": {
        "base": {
            "value": "#515BB6",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F5FB",
                "type": "color"
            },
            "100": {
                "value": "#E2E4F3",
                "type": "color"
            },
            "200": {
                "value": "#C6C9E7",
                "type": "color"
            },
            "300": {
                "value": "#9DA2D2",
                "type": "color"
            },
            "400": {
                "value": "#777EBB",
                "type": "color"
            },
            "500": {
                "value": "#565E9E",
                "type": "color"
            },
            "600": {
                "value": "#474C7A",
                "type": "color"
            },
            "700": {
                "value": "#373A58",
                "type": "color"
            },
            "800": {
                "value": "#27293A",
                "type": "color"
            },
            "900": {
                "value": "#191A24",
                "type": "color"
            }
        }
    }
}

Palettes built on #515BB6

Color Lab

Pairs with #515BB6

UI roles & guardrails

In real applications

Scales

Every model

Export