Color Details and Palettes for #309BBF

Details about the color Blue Ocean

Closest web-safe match: #3399CC

Use this color in our tools

Every tool opens preloaded with #309BBF — pick where to take it next.

 #309BBF
Simulate color Preview this color on real UI components Check contrast Check WCAG contrast for this color Generate harmony Build a 5-color harmony from this color Build a gradient Use this color as a gradient stop Convert formats View HEX, RGB, HSL, HSV, CMYK, OKLCH Color blindness Preview this color across vision types Mix with another Blend this color with another Find closest Pantone Approximate Pantone Solid Coated match

About Color Hex #309bbf

The color Blue Ocean, with hexadecimal code #309bbf, belongs to the blue color family, the world's most universally preferred hue. Blue projects trust, stability, and intellectual calm, which is why it dominates corporate, financial, and technology branding worldwide. Additionally, it evokes emotions such as Trust, Peace, Loyalty, Integrity and Tranquility. Blue signifies tranquility and stability. In Middle Eastern cultures, it can also represent protection against the evil eye, while in Western cultures, it symbolizes calmness and reliability. At 60% saturation, this color is clearly chromatic yet balanced—colorful enough to be distinctive without overwhelming adjacent content. With a mid-range lightness of 47%, it offers excellent versatility—readable as text on light backgrounds and visible as an element on dark ones. This color is ideal for designs that aim to express Trust, Peace, Loyalty, Integrity, or Tranquility. It can be effectively used in web design, branding, and marketing materials to attract attention and convey specific messages.

The RGB values for Blue Ocean are (48, 155, 191), providing a combination of red: 48, green: 155, and blue: 191. In HSL format, it has a hue of 195.00°, saturation of 60.00%, and lightness of 47.00%.

The HSV representation includes a hue of 195.00°, saturation of 75.00%, and value of 75.00%. Its CMYK composition is cyan: 75.00%, magenta: 19.00%, yellow: 0.00%, and black: 25.00%.

The calculated luminance of #309bbf is 0.278, offering a brightness level suitable for various design requirements.

This color is not part of the web-safe color palette. The closest web-safe color to this is the color HEX #3399CC. Its contrast ratio is 6.57:1 against black and 3.20:1 against white. It works well on dark backgrounds but may be less readable on lighter ones.

In terms of color temperature, #309bbf reads as cool. When it comes to accessibility, testing against standard guidelines suggests that using black text meets typical WCAG contrast standards. Additionally, the ideal foreground color for improved legibility on #309bbf is black.

Considering its saturation and lightness, #309bbf appears more vivid and energetic, making it stand out in designs that aim to capture attention.

History, Usage, Psychology & Design Ideas for #309BBF

Blue Ocean (#309BBF) belongs to the Azure color family.

This vivid mid-tone strikes the ideal balance between intensity and readability, making it a strong candidate for primary brand colors, interactive UI elements, and logo design where immediate recognition is essential.

Historical Background

Azure derives from the Arabic lazaward, referring to the lapis lazuli stone that yielded ultramarine pigment—once more costly per ounce than gold. Medieval European painters reserved ultramarine for the most sacred subjects, particularly the Virgin Mary's robes. The word azure also entered heraldry as the term for blue fields on coats of arms, symbolizing loyalty and truth.

Design & Usage Tips

Azure strikes a balance between the brightness of cyan and the depth of blue, making it a versatile choice for technology, aviation, and financial brands (Microsoft Azure is a prominent example). Pair azure with white for authority and clarity, or with light gold for a regal combination.

Sitting on the cool side of the spectrum (hue 195°), it promotes a feeling of calm distance and intellectual clarity, which is why cool hues dominate corporate identities, healthcare design, and productivity tools. With 60% saturation, it occupies a comfortable middle ground: colorful enough to be distinctive, yet restrained enough for extended reading or large surface areas.

Psychological Impact

Azure evokes trust, aspiration, and openness—like a clear sky. It feels less corporate than navy and more refined than bright blue, hitting a sweet spot for brands that want to appear both professional and approachable.

With a mid-range lightness of 47%, this tone is highly versatile: dark enough to serve as body text on white, yet light enough to stand out on charcoal or navy backgrounds.

Creative Design Ideas

Use azure as the primary brand color with charcoal text for a clean SaaS identity. Create split-screen layouts with an azure panel on one side and white on the other for impactful above-the-fold sections. In icon design, azure provides excellent visibility against both light and dark backgrounds.

#309BBF Color Conversions

Every way to write Blue Ocean — copy Blue Ocean as RGB, HSL, HSV, HWB, CMYK, OKLCH, OKLab, CIELAB, LCH, XYZ or a decimal integer. One-tap copy on every format; tap on any card to learn what it is and when to use it.

12 formats
HEX Web
#309BBF

Hexadecimal is the web’s universal color notation — two digits each for red, green and blue. Drop it straight into HTML, CSS or any design tool.

RGB Screen
rgb(48, 155, 191)

RGB is the additive Red-Green-Blue model every screen uses to emit light. The default choice for websites, apps and on-screen UI.

HSL Web
hsl(195, 60%, 47%)

HSL breaks a color into Hue, Saturation and Lightness — the most intuitive way to lighten, darken or mute a color in CSS.

HSV HSB Design
hsv(195, 75%, 75%)

HSV (also called HSB) maps Hue, Saturation and Value/Brightness. It is the model behind the color pickers in Photoshop, Figma and most design apps.

HWB CSS 4
hwb(195 19% 25%)

HWB blends a pure hue with Whiteness and Blackness — a painter-friendly model added in CSS Color 4 for quick tints and shades.

CMYK Print
cmyk(75%, 19%, 0%, 25%)

CMYK is the subtractive Cyan-Magenta-Yellow-Black ink model. Use these values when preparing artwork for a printer or commercial press.

OKLCH Modern
oklch(64.55% 0.108 225.11)

OKLCH is a modern, perceptually-uniform space (Lightness, Chroma, Hue). It powers smooth gradients and accessible palettes in today’s CSS.

OKLab Modern
oklab(64.55% -0.076 -0.076)

OKLab is the Cartesian form of OKLCH — ideal for blending and interpolating colors without the muddy midpoints older spaces produce.

CIELAB L*a*b* Perceptual
L: 59.74, a: -17.87, b: -27.22

CIELAB is a device-independent, perceptually-uniform space. It is the standard for measuring color difference (ΔE) and matching across devices.

LCH Perceptual
L: 59.74, C: 32.56, H: 236.72

LCH is CIELAB in cylindrical form — Lightness, Chroma and Hue — letting you adjust vividness and hue while staying perceptually even.

XYZ CIE Science
X: 22.34, Y: 27.83, Z: 53.48

CIE XYZ is the 1931 master space that underpins every other model here — the scientific bridge used to convert between color systems.

Decimal int Code
3185599

The 24-bit integer value of the color — handy for databases, APIs, game engines and low-level graphics code.

RGB Color Percentages for #309bbf

RGB Color Percentages for Blue Ocean (HEX Code: #309bbf) display the relative contribution of Red, Green, and Blue in forming the color. Understanding these percentages provides insight into the color's visual balance and primary components.

This color is primarily dominated by Blue, making up 48.48% of the total composition. The complete breakdown of RGB contributions is:

Red:
12.18%
Green:
39.34%
Blue:
48.48%

This analysis highlights the influence of each primary color, offering a deeper understanding of the visual characteristics of Blue Ocean.

CMYK Ink Levels & Print Guide for #309bbf

CMYK Ink Levels for Blue Ocean (HEX Code: #309bbf) provide a breakdown of the percentages of Cyan, Magenta, Yellow, and Black inks needed for accurate print reproduction. The composition of Blue Ocean prominently features Cyan, reflecting its dominant color characteristic. This information is invaluable for optimizing ink usage and achieving precise color results in printed materials.

The exact CMYK values are: Cyan: 74.87%, Magenta: 18.85%, Yellow: 0%, and Black: 25.1%.

Luminance & Contrast for #309BBF

Relative luminance gauges how bright Blue Ocean is, while the WCAG contrast ratios show how legible black or white text is on it — and which accessibility levels (AA / AAA) it passes.

Relative luminance 0.278
0 · dark1 · light
Aa
Black text 6.57:1
AA AAA Large
Aa
White text 3.20:1
AA AAA Large

Quick CSS Snippets for #309BBF

Copy-and-paste CSS for Blue Ocean — backgrounds, text, borders and a custom property. Each line is ready to drop into your stylesheet.

Background background-color: #309BBF;
Text color: #309BBF;
Border border: 2px solid #309BBF;
RGB background-color: rgb(48, 155, 191);
HSL background-color: hsl(195, 60%, 47%);
Variable --color: #309BBF;

#309bbf Monochrome Palette

The Monochrome Palette consists of shades created by adjusting the brightness. These include lighter, original, and darker shades of the color. This layout helps to visualize the color's range and its potential use in design.

#eaf5f9
#cbe6ef
#acd7e5
#8dc8dc
#6eb9d2
#4faac9
#309bbf Original
#2984a2
#226d86
#1a5569
#133e4c
#0c2730
#051013

#309bbf Complementary Palette

The Complementary Palette is made up of two colors that sit opposite each other on the color wheel. These colors create high contrast and vibrant designs, making them perfect for attention-grabbing elements and dynamic visuals.

#309bbf Original
#c05430

#309bbf Analogic Palette

The Analogic Palette consists of colors that are next to each other on the color wheel. These colors typically create harmonious and subtle designs, often used to evoke calmness and unity in your visual projects.

#309bbf Original
#3054c0
#30c09c
#5430c0
#30c054
#9c30c0
#54c030

#309bbf Triadic Palette

The Triadic Palette is made up of three colors evenly spaced on the color wheel. This combination provides a vibrant and balanced color scheme, often used for dynamic and energetic designs while maintaining harmony.

#309bbf Original
#c0309c
#9cc030

#309bbf Quad Palette

The Quad Palette, also known as tetradic, consists of four colors evenly spaced on the color wheel. This combination offers a diverse and bold color scheme, ideal for creating rich, complex designs with multiple accents while still maintaining balance.

#309bbf Original
#9c30c0
#c05430
#54c030

Color Blindness Simulation for #309bbf

Colors are perceived differently by individuals with various forms of color blindness. Use the dropdown below to see how this color may look through the eyes of someone with color vision deficiency. Explore how Blue Ocean (#309bbf) might appear to people with different visual experiences, and gain deeper insights into color accessibility for your designs!

Each color box displays a "Friendly" or "Not Friendly" tag in the bottom-right corner. A "Friendly" tag indicates that the color difference is distinguishable to individuals with the specific type of color blindness. Conversely, a "Not Friendly" tag means that the color difference might not be distinguishable, potentially causing accessibility issues in your design.

Normal Vision

Deuteranopia (Green Weakness)

Not Friendly

Protanopia (Red Weakness)

Not Friendly

Tritanopia (Blue-Yellow Weakness)

Friendly

Achromatopsia (Total Color Blindness)

Not Friendly

Color Harmonies for #309bbf

Color harmonies refer to the visually pleasing combinations of colors that are derived from specific relationships on the color wheel. These harmonious schemes, such as complementary, triadic, and analogous colors, create a balanced and engaging visual experience in design.

Complementary

Analogous

Triadic

Tetradic (Quad)

#309BBF Nearby Colors

A handful of colors just a step away from #309BBF — each one nudges the brightness, richness, or shade a little while still feeling like the same color. Use the buttons on any swatch to copy its hex or open its full color page.

#44aacc Frozen Wave
#1188aa Corfu Waters
#55bbdd Blue Martini
#007799 Pristine Seas
#0099cc Blue Burst
#5599bb Lake Lucerne
#4499cc Blue Burst
#2299bb Blue Ocean

Colors Similar to #309bbf

These colors are close neighbours of #309BBF in the RGB color space. Each subtle variation can produce a noticeably different mood in your design while remaining harmonious with the original Blue tone.

#319bbf Blue Ocean
#309cbf Blue Ocean
#309bc0 Blue Ocean
#2f9bbf Blue Ocean
#309abf Blue Ocean
#309bbe Blue Ocean
#419bbf Blue Ocean
#30acbf Viking
#309bd0 Blue Burst
#1f9bbf Blue Ocean
#308abf Forget-Me-Not
#309bae Rainy Mood

Looking for more Blue shades? Browse Blue colors →

Explore Vibrant Images Featuring Blue Ocean (#309bbf)

Discover a vibrant gallery of images that not only showcase the captivating hue of Blue Ocean, but also embody its unique mood and personality. Each carefully curated photo is selected to highlight the richness and diversity of this color, offering inspiration for design, art, and creative projects.