#FFDF21
Closest named color: Sun Yellow (#FFDF22). oklch(90.3% 0.181 98.2), rgb(255, 223, 33).
Aa
Black text reads best on this color (15.82:1).
About this color
#FFDF21 is a very light, vivid yellow. In OKLCH its lightness is 90%, its chroma 0.181 and its hue 98°. Its hue sits on the warm side of the wheel. The nearest named color is Sun Yellow (#FFDF22), ΔE 0.000 away. Black text reads best on it, at 15.82:1.
| Hue family | Yellows |
| Lightness | very light (90%) |
| Chroma | vivid (0.181) |
| Temperature | warm |
| Nearest name | Sun Yellow (#FFDF22) |
| Black text | 15.82:1 |
| White text | 1.32:1 |
Values
| HEX | #FFDF21 |
| RGB | rgb(255, 223, 33) |
| HSL | hsl(51, 100%, 56%) |
| OKLCH | oklch(90.3% 0.181 98.2) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #FFDF21 | 1.32:1 | Fails | Lc -18.3 | Dividers and decoration only |
| Black text on #FFDF21 | 15.82:1 | AAA | Lc 87.7 | Fine for body text |
| #FFDF21 text on white | 1.32:1 | Fails | Lc 15.9 | Dividers and decoration only |
| #FFDF21 text on black | 15.82:1 | AAA | Lc -87.8 | Fine for body text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 200.
-
Step 50
50
#FBF6DF
oklch(97.1% 0.031 96.9)
-
Step 100
100
#F5EBB8
oklch(93.6% 0.067 98.2)
-
Step 200
200 (this color)
#FFDF21
oklch(90.3% 0.181 98.2)
-
Step 300
300
#DDC000
oklch(80.8% 0.167 98.2)
-
Step 400
400
#B9A000
oklch(70.6% 0.146 97.9)
-
Step 500
500
#9E8900
oklch(63% 0.13 98.3)
-
Step 600
600
#857300
oklch(55.6% 0.115 98.3)
-
Step 700
700
#706100
oklch(49.2% 0.102 98.7)
-
Step 800
800
#5C4F00
oklch(42.8% 0.088 98.3)
-
Step 900
900
#4D4100
oklch(37.6% 0.078 97.3)
-
Step 950
950
#2E2600
oklch(27% 0.056 97.1)
#FFDF21 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #F7D900 | 0.020 |
| Deuteranopia (no green cones) | #FFE434 | 0.012 |
| Tritanopia (no blue cones) | #FFCDBF | 0.163 |
| Achromatopsia (no color) | #DFDFDF | 0.181 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #FFDF21
#FFDF21
oklch(90.3% 0.181 98.2)
- #D7DDFF
#D7DDFF
oklch(90.4% 0.047 277.5)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #FFDF21, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sun Yellow #FFDF22 ΔE 0.000
- Dandelion #FEDF08 ΔE 0.005
- Sunflower Yellow #FFDA03 ΔE 0.012
- Gold #FFD700 ΔE 0.019
- Sand Yellow #FCE166 ΔE 0.038
- Dull Yellow #EEDC5B ΔE 0.039
- Yellow Tan #FFE36E ΔE 0.044
- Pale Gold #FDDE6C ΔE 0.046
Use #FFDF21 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.