Color Details and Palettes for #EFEF23

Details about the color Pika Yellow

Closest web-safe match: #FFFF33

Use this color in our tools

Every tool opens preloaded with #EFEF23 — pick where to take it next.

 #EFEF23
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 #efef23

The color Pika Yellow, with hexadecimal code #efef23, resides in the yellow color family, the most visible hue in the spectrum. Yellow radiates optimism, intellect, and cheerful energy—qualities that made it the imperial color of ancient China. Additionally, it evokes emotions such as Happiness, Optimism, Positivity, Intellect and Energy. Yellow represents wealth, glory, and wisdom in various cultures, including being the color of royalty in ancient China. It is also associated with happiness and optimism in many Western cultures. With a high saturation of 86%, this color is intensely vivid—demanding attention and ideal for focal elements like buttons, banners, and brand marks. With a mid-range lightness of 54%, 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 Happiness, Optimism, Positivity, Intellect, or Energy. It can be effectively used in web design, branding, and marketing materials to attract attention and convey specific messages.

The RGB values for Pika Yellow are (239, 239, 35), providing a combination of red: 239, green: 239, and blue: 35. In HSL format, it has a hue of 60.00°, saturation of 86.00%, and lightness of 54.00%.

The HSV representation includes a hue of 60.00°, saturation of 85.00%, and value of 94.00%. Its CMYK composition is cyan: 0.00%, magenta: 0.00%, yellow: 85.00%, and black: 6.00%.

The calculated luminance of #efef23 is 0.802, 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 #FFFF33. Its contrast ratio is 17.04:1 against black and 1.23:1 against white. It works well on dark backgrounds but may be less readable on lighter ones.

In terms of color temperature, #efef23 reads as warm. 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 #efef23 is black.

Considering its saturation and lightness, #efef23 appears more vivid and energetic, making it stand out in designs that aim to capture attention.

History, Usage, Psychology & Design Ideas for #EFEF23

Pika Yellow (#EFEF23) belongs to the Yellow 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

Yellow ochre was one of the first pigments used in cave art, and later Egyptians produced orpiment—a toxic arsenic-based yellow—for tomb paintings. In imperial China, only the emperor could wear bright yellow, making it the most restricted color in the nation. Van Gogh famously obsessed over chrome yellow, using it lavishly in his Sunflowers series and Arles landscapes.

Design & Usage Tips

Yellow is the most visible color in daylight, which is why it dominates warning signs, taxi cabs, and highlighter pens. Use it for attention-grabbing headlines or promotional banners, but ensure sufficient contrast with text—dark gray or black on yellow maintains readability. Avoid large yellow backgrounds on screens, as they can cause eye fatigue.

Positioned on the warm side of the color wheel (hue 60°), it naturally draws the eye and creates a sense of closeness—making it effective for calls to action, food photography, and hospitality branding. At 86% saturation, this is a highly vivid color that demands attention. Use it where maximum visual impact is needed—feature banners, accent buttons, and data-visualization highlights.

Psychological Impact

Yellow radiates optimism, intellect, and energy. It stimulates mental activity and generates a sense of cheerfulness, which makes it popular in children's products and educational materials. However, overly bright yellows can provoke anxiety, so context and tone matter.

With a mid-range lightness of 54%, 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

Pair canary yellow with charcoal for a modern, high-contrast editorial style. Use soft butter yellow as a background for recipe blogs or lifestyle content to evoke warmth. In branding, a yellow logomark on a white background signals innovation and forward-thinking (think Snapchat or National Geographic).

#EFEF23 Color Conversions

Every way to write Pika Yellow — copy Pika Yellow 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
#EFEF23

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(239, 239, 35)

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(60, 86%, 54%)

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(60, 85%, 94%)

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(60 14% 6%)

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(0%, 0%, 85%, 6%)

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(92.23% 0.195 109.68)

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

OKLab Modern
oklab(92.23% -0.066 0.184)

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: 91.78, a: -20.08, b: 85.96

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

LCH Perceptual
L: 91.78, C: 88.28, H: 103.15

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

XYZ CIE Science
X: 66.77, Y: 80.21, Z: 13.55

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
15724323

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

RGB Color Percentages for #efef23

RGB Color Percentages for Pika Yellow (HEX Code: #efef23) 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 Red, making up 46.59% of the total composition. The complete breakdown of RGB contributions is:

Red:
46.59%
Green:
46.59%
Blue:
6.82%

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

CMYK Ink Levels & Print Guide for #efef23

CMYK Ink Levels for Pika Yellow (HEX Code: #efef23) provide a breakdown of the percentages of Cyan, Magenta, Yellow, and Black inks needed for accurate print reproduction. The composition of Pika Yellow prominently features Yellow, 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: 0%, Magenta: 0%, Yellow: 85.36%, and Black: 6.27%.

Luminance & Contrast for #EFEF23

Relative luminance gauges how bright Pika Yellow 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 0.802
0 · dark1 · light
Aa
Black text 17.04:1
AA AAA Large
Aa
White text 1.23:1
AA AAA Large

Quick CSS Snippets for #EFEF23

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

Background background-color: #EFEF23;
Text color: #EFEF23;
Border border: 2px solid #EFEF23;
RGB background-color: rgb(239, 239, 35);
HSL background-color: hsl(60, 86%, 54%);
Variable --color: #EFEF23;

#efef23 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.

#fdfde9
#fbfbc8
#f9f9a7
#f6f686
#f4f465
#f1f144
#efef23 Original
#cbcb1e
#a7a719
#838313
#60600e
#3c3c09
#181804

#efef23 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.

#efef23 Original
#2525ef

#efef23 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.

#efef23 Original
#8aef25
#ef8a25
#25ef25
#ef2525
#25ef8a
#ef258a

#efef23 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.

#efef23 Original
#25efef
#ef25ef

#efef23 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.

#efef23 Original
#25ef8a
#2525ef
#ef258a

Color Blindness Simulation for #efef23

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 Pika Yellow (#efef23) 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)

Friendly

Tritanopia (Blue-Yellow Weakness)

Not Friendly

Achromatopsia (Total Color Blindness)

Not Friendly

Color Harmonies for #efef23

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)

#EFEF23 Nearby Colors

A handful of colors just a step away from #EFEF23 — 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.

#ffff33 Yellow
#dddd00 Sun Flooded Woods
#ffff44 Peppy Pineapple
#cccc00 Golden Harvest
#eeee00 Golden Ginkgo
#eeee44 Sulphuric
#ccee33 Lime Fizz
#ffee22 Pure Sunshine

Colors Similar to #efef23

These colors are close neighbours of #EFEF23 in the RGB color space. Each subtle variation can produce a noticeably different mood in your design while remaining harmonious with the original Yellow tone.

#f0ef23 Pika Yellow
#eff023 Golden Ginkgo
#efef24 Pika Yellow
#eeef23 Pika Yellow
#efee23 Pika Yellow
#efef22 Pika Yellow
#ffef23 Pure Sunshine
#efff23 John Lemon
#efef34 Pika Yellow
#deef23 Poisonous Pesto
#efde23 Caduceus Staff
#efef12 Golden Ginkgo

Looking for more Yellow shades? Browse Yellow colors →

Explore Vibrant Images Featuring Pika Yellow (#efef23)

Discover a vibrant gallery of images that not only showcase the captivating hue of Pika Yellow, 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.