#C9C900
Closest named color: Mustard Yellow (#D2BD0A). oklch(80.9% 0.176 109.8), rgb(201, 201, 0).
Aa
Black text reads best on this color (11.83:1).
About this color
#C9C900 is a light, vivid yellow. In OKLCH its lightness is 81%, its chroma 0.176 and its hue 110°. Its hue sits on the warm side of the wheel. The nearest named color is Mustard Yellow (#D2BD0A), ΔE 0.033 away. Black text reads best on it, at 11.83:1.
| Hue family | Yellows |
| Lightness | light (81%) |
| Chroma | vivid (0.176) |
| Temperature | warm |
| Nearest name | Mustard Yellow (#D2BD0A) |
| Black text | 11.83:1 |
| White text | 1.77:1 |
Values
| HEX | #C9C900 |
| RGB | rgb(201, 201, 0) |
| HSL | hsl(60, 100%, 39%) |
| OKLCH | oklch(80.9% 0.176 109.8) |
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 #C9C900 | 1.77:1 | Fails | Lc -36.4 | Non-text elements, placeholder text |
| Black text on #C9C900 | 11.83:1 | AAA | Lc 71.4 | Content text, not long reading |
| #C9C900 text on white | 1.77:1 | Fails | Lc 32.4 | Non-text elements, placeholder text |
| #C9C900 text on black | 11.83:1 | AAA | Lc -70.3 | Content text, not long reading |
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 300.
-
Step 50
50
#F6F7E5
oklch(97.1% 0.024 109.4)
-
Step 100
100
#EBEDC7
oklch(93.5% 0.05 109.8)
-
Step 200
200
#DDDF92
oklch(88.5% 0.098 109.5)
-
Step 300
300 (this color)
#C9C900
oklch(80.9% 0.176 109.8)
-
Step 400
400
#A8A800
oklch(70.8% 0.154 109.8)
-
Step 500
500
#909000
oklch(63.2% 0.138 109.8)
-
Step 600
600
#787800
oklch(55.4% 0.121 109.8)
-
Step 700
700
#656500
oklch(49.1% 0.107 109.8)
-
Step 800
800
#535300
oklch(42.8% 0.093 109.8)
-
Step 900
900
#454500
oklch(37.8% 0.082 109.8)
-
Step 950
950
#292900
oklch(27.2% 0.059 109.8)
#C9C900 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) | #DAC000 | 0.033 |
| Deuteranopia (no green cones) | #DCC525 | 0.033 |
| Tritanopia (no blue cones) | #D8BBAB | 0.160 |
| Achromatopsia (no color) | #C2C2C2 | 0.176 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C9C900
#C9C900
oklch(80.9% 0.176 109.8)
- #BFB6FF
#BFB6FF
oklch(81% 0.102 289.6)
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 #C9C900, closest first.
No curated palette has a color within ΔE 0.04 of #C9C900.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mustard Yellow #D2BD0A ΔE 0.033
- Olive Yellow #C2B709 ΔE 0.049
- Dark Yellow #D5B60A ΔE 0.051
- Mustard #CEB301 ΔE 0.057
- Yellow Green #9ACD32 ΔE 0.059
- Pea #A4BF20 ΔE 0.059
- Slime Green #99CC04 ΔE 0.063
- Golden #F5BF03 ΔE 0.069
Use #C9C900 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.