What color is #3333F7?

#3333F7 is a medium, vivid blue. In RGB it is rgb(51, 51, 247), and in HSL hsl(240, 92%, 58%).

Is #3333F7 accessible as text?

On white, #3333F7 has a contrast ratio of 7.10:1 (passes WCAG AA for body text); on black it is 2.96:1 (fails). For text placed on #3333F7, use white for the best readability.

What is the closest Tailwind color to #3333F7?

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

What colors go well with #3333F7?

#3333F7 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #F6F631. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #3333F7 below.

Is #3333F7 good for buttons?

#3333F7 works well for buttons and highlights, but use white text on #3333F7 — black text only reaches 2.96:1, below the 4.5:1 needed for normal-size labels.

Is #3333F7 the same as CSS blue?

No — #3333F7 is not the CSS named color blue, but blue (#0000FF) is the closest CSS named color.

#3333F7 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #3333F7

Not just a swatch — here's how #3333F7 works with other colors. Named schemes with #3333F7 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #3333F7 Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #4F6AFF

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

Coastal Morning Lead · 5 colors

Lead #3333F7 Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

Ultramarine 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 #3333F7 Surface #F6E5D8 Anchor #5B2143 Accent #E5C2C9 Secondary #322B2F

Ultramarine 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 #3333F7 Secondary #7286C3 Support #9D8F88 Ink #18140F

Ultramarine 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 Ultramarine carrying the quiet middle.

Sunset Warmth Glow · 5 colors

Glow #3333F7 Secondary #E86A73 Accent #F69250 Anchor #573B58 Surface #F7E7D7

Ultramarine 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 #3333F7 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 12/100

Cool

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

Softness 23/100

Low

Firm and assertive — carries weight and contrast.

Depth 58/100

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 0/100

Very low

Clean and current — no dusty, aged cast.

Luxury 47/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 100/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 47/100

Moderate

Workable accent with care around contrast.

Surface fit 8/100

Very low

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

Print safety 53/100

Moderate

Prints close, with a slight loss of vibrancy.

Pairs with #3333F7

For UI

For branding

For interior

For fashion

People also use #3333F7 with

Picton Blue Blue Violet Pear 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 #DBDBF8 for cards and hover fills. Tint 80

Avoid beside #7331F6 — 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 #3333F7 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: #3333F7;
  --color-base-rgb: 51 51 247;
  --color-base-oklch: oklch(48.8% 0.274 270.2);
  --color-50: #F0F0FE;
  --color-100: #D8D8FD;
  --color-200: #B1B1FC;
  --color-300: #7C7CF3;
  --color-400: #4D4DE5;
  --color-500: #2929CB;
  --color-600: #28289A;
  --color-700: #22226D;
  --color-800: #1A1A47;
  --color-900: #12122B;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  ultramarine: {
    50: '#F0F0FE',
    100: '#D8D8FD',
    200: '#B1B1FC',
    300: '#7C7CF3',
    400: '#4D4DE5',
    500: '#2929CB',
    600: '#28289A',
    700: '#22226D',
    800: '#1A1A47',
    900: '#12122B',
  },
}

$base: #3333F7;
$base-ink: #FFFFFF;
$base-50: #F0F0FE;
$base-100: #D8D8FD;
$base-200: #B1B1FC;
$base-300: #7C7CF3;
$base-400: #4D4DE5;
$base-500: #2929CB;
$base-600: #28289A;
$base-700: #22226D;
$base-800: #1A1A47;
$base-900: #12122B;
$base-hover: #0909E3;
$base-subtle: #C8C8F5;

{
    "color": {
        "base": {
            "value": "#3333F7",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F0FE",
                "type": "color"
            },
            "100": {
                "value": "#D8D8FD",
                "type": "color"
            },
            "200": {
                "value": "#B1B1FC",
                "type": "color"
            },
            "300": {
                "value": "#7C7CF3",
                "type": "color"
            },
            "400": {
                "value": "#4D4DE5",
                "type": "color"
            },
            "500": {
                "value": "#2929CB",
                "type": "color"
            },
            "600": {
                "value": "#28289A",
                "type": "color"
            },
            "700": {
                "value": "#22226D",
                "type": "color"
            },
            "800": {
                "value": "#1A1A47",
                "type": "color"
            },
            "900": {
                "value": "#12122B",
                "type": "color"
            }
        }
    }
}

Palettes built on #3333F7

Color Lab

Pairs with #3333F7

UI roles & guardrails

In real applications

Scales

Every model

Export