What color is #555DBE?

#555DBE is a medium blue-violet. In RGB it is rgb(85, 93, 190), and in HSL hsl(235, 45%, 54%).

Is #555DBE accessible as text?

On white, #555DBE has a contrast ratio of 5.68:1 (passes WCAG AA for body text); on black it is 3.70:1 (fails). For text placed on #555DBE, use white for the best readability.

What is the closest Tailwind color to #555DBE?

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

What colors go well with #555DBE?

#555DBE pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #BEB655. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #555DBE below.

Is #555DBE good for buttons?

#555DBE works well for buttons and highlights, but use white text on #555DBE — black text only reaches 3.70:1, below the 4.5:1 needed for normal-size labels.

Is #555DBE the same as CSS slateblue?

No — #555DBE is not the CSS named color slateblue, but slateblue (#6A5ACD) is the closest CSS named color.

#555DBE Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #555DBE

Not just a swatch — here's how #555DBE works with other colors. Named schemes with #555DBE in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #555DBE 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 #555DBE 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 #555DBE Anchor #3B2923 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 #555DBE 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 #555DBE Secondary #8A91B4 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 #555DBE 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 19/100

Cool

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

Softness 39/100

Low

Middle-weight — neither delicate nor heavy.

Depth 49/100

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 42/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 53/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 41/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 100/100

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 76/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #555DBE

For UI

For branding

For interior

For fashion

People also use #555DBE with

Iceberg Royal Purple Dark Khaki 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 5.7:1. Use

Subtle surface Use #E0E1EF for cards and hover fills. Tint 80

Avoid beside #6F55BE — 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 #555DBE 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: #555DBE;
  --color-base-rgb: 85 93 190;
  --color-base-oklch: oklch(52.2% 0.150 276.3);
  --color-50: #F4F4FB;
  --color-100: #E1E3F4;
  --color-200: #C4C7E8;
  --color-300: #9B9FD5;
  --color-400: #747ABE;
  --color-500: #5359A2;
  --color-600: #454A7D;
  --color-700: #35385A;
  --color-800: #26273B;
  --color-900: #191A25;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  tanzanite: {
    50: '#F4F4FB',
    100: '#E1E3F4',
    200: '#C4C7E8',
    300: '#9B9FD5',
    400: '#747ABE',
    500: '#5359A2',
    600: '#454A7D',
    700: '#35385A',
    800: '#26273B',
    900: '#191A25',
  },
}

$base: #555DBE;
$base-ink: #FFFFFF;
$base-50: #F4F4FB;
$base-100: #E1E3F4;
$base-200: #C4C7E8;
$base-300: #9B9FD5;
$base-400: #747ABE;
$base-500: #5359A2;
$base-600: #454A7D;
$base-700: #35385A;
$base-800: #26273B;
$base-900: #191A25;
$base-hover: #3D45A0;
$base-subtle: #D0D2E8;

{
    "color": {
        "base": {
            "value": "#555DBE",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F4FB",
                "type": "color"
            },
            "100": {
                "value": "#E1E3F4",
                "type": "color"
            },
            "200": {
                "value": "#C4C7E8",
                "type": "color"
            },
            "300": {
                "value": "#9B9FD5",
                "type": "color"
            },
            "400": {
                "value": "#747ABE",
                "type": "color"
            },
            "500": {
                "value": "#5359A2",
                "type": "color"
            },
            "600": {
                "value": "#454A7D",
                "type": "color"
            },
            "700": {
                "value": "#35385A",
                "type": "color"
            },
            "800": {
                "value": "#26273B",
                "type": "color"
            },
            "900": {
                "value": "#191A25",
                "type": "color"
            }
        }
    }
}

Palettes built on #555DBE

Color Lab

Pairs with #555DBE

UI roles & guardrails

In real applications

Scales

Every model

Export