What color is #40BBEF?

#40BBEF is a medium, vivid cyan-blue. In RGB it is rgb(64, 187, 239), and in HSL hsl(198, 85%, 59%).

Is #40BBEF accessible as text?

On white, #40BBEF has a contrast ratio of 2.19:1 (fails WCAG AA for body text); on black it is 9.57:1 (passes). For text placed on #40BBEF, use black for the best readability.

What is the closest Tailwind color to #40BBEF?

The nearest Tailwind CSS token is sky-400 (#00BCFF).

What colors go well with #40BBEF?

#40BBEF pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #EF733E. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #40BBEF below.

Is #40BBEF good for buttons?

#40BBEF works well for buttons and highlights, but use black text on #40BBEF — white text only reaches 2.19:1, below the 4.5:1 needed for normal-size labels.

Is #40BBEF the same as CSS deepskyblue?

No — #40BBEF is not the CSS named color deepskyblue, but deepskyblue (#00BFFF) is the closest CSS named color.

#40BBEF Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #40BBEF

Not just a swatch — here's how #40BBEF works with other colors. Named schemes with #40BBEF in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #40BBEF Accent #A6C4BF Surface #DEDABF Secondary #9AA0A0 Anchor #1F344A

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

Nordic Calm Accent · 5 colors

Accent #40BBEF Secondary #AEB4B8 Surface #F1F2F0 Support #7B93A6 Anchor #2E3236

Deep Sky Blue keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.

Tech Product Signal · 5 colors

Signal #40BBEF Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #7BE1FF

Deep Sky 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 Deep Sky Blue.

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #40BBEF Secondary #BCE0F2 Support #969386 Ink #16140F

Deep Sky 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 Deep Sky Blue carrying the quiet middle.

Modern Café Dominant · 5 colors

Dominant #40BBEF Anchor #372C1D Surface #EAE5D0 Accent #7C9D76 Secondary #393933

Deep Sky Blue 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.

Build a working theme in the generator →

Color Lab

How #40BBEF 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 57/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 26/100

Low

Airy and open — recedes, leaves the composition light.

Naturalness 1/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 33/100

Low

A faint retro warmth without tipping into sepia.

Luxury 33/100

Low

Understated — leans refined without going austere.

Brand distinctiveness 50/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 44/100

Moderate

Workable accent with care around contrast.

Surface fit 37/100

Low

Usable as a tinted surface in measured doses.

Print safety 67/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #40BBEF

For UI

For branding

For interior

For fashion

People also use #40BBEF with

Seafoam Green Neon Blue Burnt Sienna Platinum Charcoal

UI roles & guardrails

Primary action Safe as a filled button with near-black label. AAA

Body text Do not use for body copy on light surfaces. Avoid

Large display Only on dark surfaces. Avoid

Background Pair with #141310 text at 8.5:1. Use

Subtle surface Use #DDEFF7 for cards and hover fills. Tint 80

Avoid beside #3E7FEF — 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 #40BBEF at work across the surfaces designers actually ship.

Website / UI

Northwind Sign up

Build faster.

A working theme, generated in seconds.

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: #40BBEF;
  --color-base-rgb: 64 187 239;
  --color-base-oklch: oklch(74.7% 0.129 230.6);
  --color-50: #F0FAFE;
  --color-100: #D8F2FD;
  --color-200: #B4E4F9;
  --color-300: #81CEEE;
  --color-400: #53B5DF;
  --color-500: #3098C5;
  --color-600: #2C7696;
  --color-700: #25556A;
  --color-800: #1C3945;
  --color-900: #13232A;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  deep-sky-blue: {
    50: '#F0FAFE',
    100: '#D8F2FD',
    200: '#B4E4F9',
    300: '#81CEEE',
    400: '#53B5DF',
    500: '#3098C5',
    600: '#2C7696',
    700: '#25556A',
    800: '#1C3945',
    900: '#13232A',
  },
}

$base: #40BBEF;
$base-ink: #141310;
$base-50: #F0FAFE;
$base-100: #D8F2FD;
$base-200: #B4E4F9;
$base-300: #81CEEE;
$base-400: #53B5DF;
$base-500: #3098C5;
$base-600: #2C7696;
$base-700: #25556A;
$base-800: #1C3945;
$base-900: #13232A;
$base-hover: #12A1DF;
$base-subtle: #CBE8F4;

{
    "color": {
        "base": {
            "value": "#40BBEF",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0FAFE",
                "type": "color"
            },
            "100": {
                "value": "#D8F2FD",
                "type": "color"
            },
            "200": {
                "value": "#B4E4F9",
                "type": "color"
            },
            "300": {
                "value": "#81CEEE",
                "type": "color"
            },
            "400": {
                "value": "#53B5DF",
                "type": "color"
            },
            "500": {
                "value": "#3098C5",
                "type": "color"
            },
            "600": {
                "value": "#2C7696",
                "type": "color"
            },
            "700": {
                "value": "#25556A",
                "type": "color"
            },
            "800": {
                "value": "#1C3945",
                "type": "color"
            },
            "900": {
                "value": "#13232A",
                "type": "color"
            }
        }
    }
}

Palettes built on #40BBEF

Color Lab

Pairs with #40BBEF

UI roles & guardrails

In real applications

Scales

Every model

Export