What color is #310CE9?

#310CE9 is a medium, vivid indigo. In RGB it is rgb(49, 12, 233), and in HSL hsl(250, 90%, 48%).

Is #310CE9 accessible as text?

On white, #310CE9 has a contrast ratio of 8.90:1 (passes WCAG AA for body text); on black it is 2.36:1 (fails). For text placed on #310CE9, use white for the best readability.

What is the closest Tailwind color to #310CE9?

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

What colors go well with #310CE9?

#310CE9 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #C4E90C. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #310CE9 below.

Is #310CE9 good for buttons?

#310CE9 works well for buttons and highlights, but use white text on #310CE9 — black text only reaches 2.36:1, below the 4.5:1 needed for normal-size labels.

Is #310CE9 the same as CSS blue?

No — #310CE9 is not the CSS named color blue, but blue (#0000FF) is the closest CSS named color.

#310CE9 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #310CE9

Not just a swatch — here's how #310CE9 works with other colors. Named schemes with #310CE9 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #310CE9 Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #4857FF

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 #310CE9 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 #310CE9 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 #310CE9 Secondary #6677B5 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 #310CE9 Secondary #E86A73 Accent #F6924F 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 #310CE9 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 21/100

Low

Firm and assertive — carries weight and contrast.

Depth 63/100

High

Deep and grounding — anchors a layout, strong dark-mode base.

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 50/100

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 40/100

Low

Workable accent with care around contrast.

Surface fit 11/100

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 #310CE9

For UI

For branding

For interior

For fashion

People also use #310CE9 with

Azure Electric Purple 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 8.9:1. Use

Subtle surface Use #D9D3F6 for cards and hover fills. Tint 80

Avoid beside #7A0CE9 — 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 #310CE9 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: #310CE9;
  --color-base-rgb: 49 12 233;
  --color-base-oklch: oklch(44.2% 0.280 271.4);
  --color-50: #F3F0FE;
  --color-100: #DED8FD;
  --color-200: #BEB2FB;
  --color-300: #917EF2;
  --color-400: #674FE3;
  --color-500: #462BCA;
  --color-600: #3C2999;
  --color-700: #2F236C;
  --color-800: #221B46;
  --color-900: #16122B;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  ultramarine: {
    50: '#F3F0FE',
    100: '#DED8FD',
    200: '#BEB2FB',
    300: '#917EF2',
    400: '#674FE3',
    500: '#462BCA',
    600: '#3C2999',
    700: '#2F236C',
    800: '#221B46',
    900: '#16122B',
  },
}

$base: #310CE9;
$base-ink: #FFFFFF;
$base-50: #F3F0FE;
$base-100: #DED8FD;
$base-200: #BEB2FB;
$base-300: #917EF2;
$base-400: #674FE3;
$base-500: #462BCA;
$base-600: #3C2999;
$base-700: #2F236C;
$base-800: #221B46;
$base-900: #16122B;
$base-hover: #270ABA;
$base-subtle: #C5BCF2;

{
    "color": {
        "base": {
            "value": "#310CE9",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F0FE",
                "type": "color"
            },
            "100": {
                "value": "#DED8FD",
                "type": "color"
            },
            "200": {
                "value": "#BEB2FB",
                "type": "color"
            },
            "300": {
                "value": "#917EF2",
                "type": "color"
            },
            "400": {
                "value": "#674FE3",
                "type": "color"
            },
            "500": {
                "value": "#462BCA",
                "type": "color"
            },
            "600": {
                "value": "#3C2999",
                "type": "color"
            },
            "700": {
                "value": "#2F236C",
                "type": "color"
            },
            "800": {
                "value": "#221B46",
                "type": "color"
            },
            "900": {
                "value": "#16122B",
                "type": "color"
            }
        }
    }
}

Palettes built on #310CE9

Color Lab

Pairs with #310CE9

UI roles & guardrails

In real applications

Scales

Every model

Export