Yellow 4
yellow-4 · #FFD43B
HEX
#FFD43B
RGB
rgb(255, 212, 59)
CMYK
cmyk(0%, 17%, 77%, 0%)
HSL
hsl(47, 100%, 62%)
LAB
lab(86.3, 0.7, 75.7)
What is Yellow 4?
Yellow 4 is the yellow-4 reference in the Open Color. Its sRGB value is #FFD43B (rgb 255, 212, 59). It sits in the yellow family. Open Color, an open-source color palette by Heeyeun designed for UI work. 13 hues across 10 shades (0 to 9) tuned for screen legibility and accessibility. See disclaimer for accuracy and trademark notes.
Accessibility
WCAG 2.1 contrast checks for Yellow 4 as a background.
Black text on this color
White text on this color
Shades, tints & tonal scale of Yellow 4
An 11-step tonal scale derived from Yellow 4 (#FFD43B). Click any swatch to copy its HEX. Use these as a starting point for design tokens, hover states, and disabled states in a design system.
50
#FFFCEF
#FFFCEF
100
#FFF8E0
#FFF8E0
200
#FFF1C0
#FFF1C0
300
#FFEA9D
#FFEA9D
400
#FFDF6C
#FFDF6C
500
#FFD43B
#FFD43B
600
#D9B432
#D9B432
700
#A68A26
#A68A26
800
#735F1B
#735F1B
900
#40350F
#40350F
950
#1F1907
#1F1907
Lighter tints (mixed with white)
15%
#FFDB78
30%
#FFE29C
45%
#FFE9B7
60%
#FFEFCE
75%
#FFF5E2
Darker shades (mixed with black)
15%
#EDC536
30%
#DAB531
45%
#C4A22B
60%
#AA8C24
75%
#89711B
Color harmonies for Yellow 4
Classic color-theory harmonies derived from rotating the hue of Yellow 4. Use these to build accent palettes, brand systems, and accessible UI color pairings.
Complementary
180° opposite — strongest contrast
#FFD43B
#FFD43B
#3D67FF
#3D67FF
Triadic
Three colors 120° apart
#FFD43B
#FFD43B
#3DFFD5
#3DFFD5
#D53DFF
#D53DFF
Analogous
Two neighbors ±30° on the wheel
#FF743D
#FF743D
#FFD43B
#FFD43B
#C8FF3D
#C8FF3D
Split-complementary
Base + two colors flanking its complement
#FFD43B
#FFD43B
#3DC8FF
#3DC8FF
#743DFF
#743DFF
Tetradic
Two complementary pairs
#FFD43B
#FFD43B
#67FF3D
#67FF3D
#3D67FF
#3D67FF
#D53DFF
#D53DFF
Square
Four colors evenly spaced 90° apart
#FFD43B
#FFD43B
#3DFF74
#3DFF74
#3D67FF
#3D67FF
#FF3DC8
#FF3DC8
Yellow 4 in every color space
Full conversion of Yellow 4 across the color spaces designers and developers actually use — including OKLCH (the perceptually-uniform space that powers Tailwind v4 and CSS Color Module Level 4) and HWB.
HEX
#FFD43B
RGB
rgb(255, 212, 59)
CMYK
cmyk(0%, 17%, 77%, 0%)
HSL
hsl(47, 100%, 62%)
HSV
hsv(47, 77%, 100%)
HWB
hwb(47 23% 0%)
CIE Lab
lab(86.3 0.7 75.7)
OKLCH
oklch(88.3% 0.165 92.2)
XYZ (D65)
xyz(65.58, 68.67, 13.94)
Copy-ready code for Yellow 4
Drop-in snippets for CSS, Tailwind, Sass, iOS Swift, and Android XML. Click the copy button on any snippet to put it on your clipboard.
CSS
color: #FFD43B;
background-color: #FFD43B;CSS variable
:root {
--color-yellow-4: #FFD43B;
}Tailwind config
// tailwind.config.js
colors: {
'yellow-4': '#FFD43B',
}Sass
$color-yellow-4: #FFD43B;Swift UIColor
UIColor(red: 1.000, green: 0.831, blue: 0.231, alpha: 1.0)Android XML
<color name="yellow-4">#FFD43B</color>Closest match in every color system
The nearest Yellow 4 equivalent in every other color system on this site, ranked by ΔE2000 perceptual distance. Useful when translating between design-system, web-standard, and industrial color references.
Closest in Open Color
Top 6 ΔE2000-closest entries within the same collection.
Closest Pantone matches
Top 6 ΔE2000-closest Pantone references. Cross-system matching is approximate — see disclaimer.
Closest RAL Classic matches
Top 6 ΔE2000-closest RAL Classic references for industrial coating cross-reference.
RAL 1017
#F5D033
Saffron yellow
RAL 1023
#FAD201
Traffic yellow
RAL 1021
#F3DA0B
Rape yellow
RAL 1003
#E5BE01
Signal yellow
RAL 1014
#E1CC4F
Ivory
RAL 1032
#D6AE01
Broom yellow
FAQ about Yellow 4
What is the HEX code for Yellow 4?
Yellow 4 (yellow-4) has the HEX code #FFD43B. In RGB it is rgb(255, 212, 59), and in CMYK it is cmyk(0%, 17%, 77%, 0%).
What is the OKLCH value of Yellow 4?
Yellow 4 converts to oklch(0.883 0.165 92.2). OKLCH is the perceptually uniform color space used by Tailwind v4 and CSS Color Module Level 4.
Is Yellow 4 accessible for body text?
Used as a background, Yellow 4 has a contrast ratio of 14.73:1 with black text and 1.43:1 with white text. WCAG 2.1 AA requires 4.5:1 for normal text. The current recommendation is to use black text and verify in real UI context.
What is the closest Pantone to Yellow 4?
The closest Pantone reference to Yellow 4 by ΔE2000 perceptual distance is Pantone 115 C (#FED141). Cross-system Pantone matching is approximate; for color-critical print work, verify with a physical Pantone guide.
What is the closest RAL color to Yellow 4?
The closest RAL Classic reference to Yellow 4 by ΔE2000 distance is RAL 1017 (Saffron yellow, #F5D033). RAL is a German industrial coating standard commonly used for paint, powder coat, and architectural specification.
What is the complementary color of Yellow 4?
The complementary color (180° opposite on the HSL color wheel) of Yellow 4 is #3D67FF. Use it for high-contrast accents, error states, or call-to-action pairings.
Data provenance & source
Open Color (Yeun)
Open Color, an open-source color palette by Heeyeun designed for UI designers and developers. 13 hues across 10 shades. Use as a designer-friendly palette alternative to Tailwind. Values are intentionally chosen for UI legibility and accessibility.
- Source type
- derived
- Confidence
- high
- License
- MIT
- Last reviewed
- 2026-05-24
Workflow tags
Open Color values are tuned for digital UI. For print, treat as a starting point and proof against the substrate.