What color is #355BE3?

#355BE3 is a medium, vivid blue. In RGB it is rgb(53, 91, 227), and in HSL hsl(227, 76%, 55%).

Is #355BE3 accessible as text?

On white, #355BE3 has a contrast ratio of 5.59:1 (passes WCAG AA for body text); on black it is 3.76:1 (fails). For text placed on #355BE3, use white for the best readability.

What is the closest Tailwind color to #355BE3?

The nearest Tailwind CSS token is blue-600 (#155DFC).

What colors go well with #355BE3?

#355BE3 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #E3BE35. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #355BE3 below.

Is #355BE3 good for buttons?

#355BE3 works well for buttons and highlights, but use white text on #355BE3 — black text only reaches 3.76:1, below the 4.5:1 needed for normal-size labels.

Is #355BE3 the same as CSS royalblue?

No — #355BE3 is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#355BE3 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #355BE3

Not just a swatch — here's how #355BE3 works with other colors. Named schemes with #355BE3 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #355BE3 Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #5A85FF

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

Coastal Morning Lead · 5 colors

Lead #355BE3 Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

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

Berry & Cream Lead · 5 colors

Lead #355BE3 Surface #F6E5D8 Anchor #5B2143 Accent #E5C2CA Secondary #322B2F

Royal 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 #355BE3 Secondary #8194C3 Support #9D8F88 Ink #18140F

Royal 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 Royal Blue carrying the quiet middle.

Sunset Warmth Glow · 5 colors

Glow #355BE3 Secondary #E86A74 Accent #F79250 Anchor #573B58 Surface #F7E7D7

Royal Blue 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 #355BE3 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 10/100

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 21/100

Low

Clean and current — no dusty, aged cast.

Luxury 48/100

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 82/100

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 62/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #355BE3

For UI

For branding

For interior

For fashion

People also use #355BE3 with

Lagoon Blue Blue Violet Honey Gainsboro Gunmetal Gray

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 5.6:1. Use

Subtle surface Use #DBE1F5 for cards and hover fills. Tint 80

Avoid beside #4935E3 — 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 #355BE3 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: #355BE3;
  --color-base-rgb: 53 91 227;
  --color-base-oklch: oklch(53.0% 0.211 266.8);
  --color-50: #F1F4FE;
  --color-100: #DAE1FB;
  --color-200: #B7C5F5;
  --color-300: #879CE9;
  --color-400: #5A75D8;
  --color-500: #3754BD;
  --color-600: #324690;
  --color-700: #293666;
  --color-800: #1E2643;
  --color-900: #141929;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  royal-blue: {
    50: '#F1F4FE',
    100: '#DAE1FB',
    200: '#B7C5F5',
    300: '#879CE9',
    400: '#5A75D8',
    500: '#3754BD',
    600: '#324690',
    700: '#293666',
    800: '#1E2643',
    900: '#141929',
  },
}

$base: #355BE3;
$base-ink: #FFFFFF;
$base-50: #F1F4FE;
$base-100: #DAE1FB;
$base-200: #B7C5F5;
$base-300: #879CE9;
$base-400: #5A75D8;
$base-500: #3754BD;
$base-600: #324690;
$base-700: #293666;
$base-800: #1E2643;
$base-900: #141929;
$base-hover: #1B40C5;
$base-subtle: #C9D1F0;

{
    "color": {
        "base": {
            "value": "#355BE3",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F4FE",
                "type": "color"
            },
            "100": {
                "value": "#DAE1FB",
                "type": "color"
            },
            "200": {
                "value": "#B7C5F5",
                "type": "color"
            },
            "300": {
                "value": "#879CE9",
                "type": "color"
            },
            "400": {
                "value": "#5A75D8",
                "type": "color"
            },
            "500": {
                "value": "#3754BD",
                "type": "color"
            },
            "600": {
                "value": "#324690",
                "type": "color"
            },
            "700": {
                "value": "#293666",
                "type": "color"
            },
            "800": {
                "value": "#1E2643",
                "type": "color"
            },
            "900": {
                "value": "#141929",
                "type": "color"
            }
        }
    }
}