#99C638
Closest named color: Yellow Green (#9ACD32). oklch(76.8% 0.172 125.7), rgb(153, 198, 56).
Aa
Black text reads best on this color (10.48:1).
About this color
#99C638 is a medium-light, vivid green. In OKLCH its lightness is 77%, its chroma 0.172 and its hue 126°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Yellow Green (#9ACD32), ΔE 0.020 away. Black text reads best on it, at 10.48:1.
| Hue family | Greens |
| Lightness | medium-light (77%) |
| Chroma | vivid (0.172) |
| Temperature | in between |
| Nearest name | Yellow Green (#9ACD32) |
| Black text | 10.48:1 |
| White text | 2.00:1 |
Values
| HEX | #99C638 |
| RGB | rgb(153, 198, 56) |
| HSL | hsl(79, 56%, 50%) |
| OKLCH | oklch(76.8% 0.172 125.7) |
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 #99C638 | 2.00:1 | Fails | Lc -43.1 | Non-text elements, placeholder text |
| Black text on #99C638 | 10.48:1 | AAA | Lc 65.3 | Content text, not long reading |
| #99C638 text on white | 2.00:1 | Fails | Lc 38.6 | Non-text elements, placeholder text |
| #99C638 text on black | 10.48:1 | AAA | Lc -63.8 | 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
#F2F9E8
oklch(97.2% 0.024 125.2)
-
Step 100
100
#E2F0CD
oklch(93.6% 0.049 125.1)
-
Step 200
200
#CAE59F
oklch(88.5% 0.096 125.4)
-
Step 300
300 (this color)
#99C638
oklch(76.8% 0.172 125.7)
-
Step 400
400
#85B300
oklch(70.7% 0.18 125.9)
-
Step 500
500
#729900
oklch(63.1% 0.16 125.6)
-
Step 600
600
#5F8100
oklch(55.7% 0.141 125.9)
-
Step 700
700
#4F6C00
oklch(49% 0.125 125.9)
-
Step 800
800
#415900
oklch(42.8% 0.109 125.6)
-
Step 900
900
#354A00
oklch(37.7% 0.096 125.9)
-
Step 950
950
#1E2C00
oklch(27% 0.069 126.1)
#99C638 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) | #D1B91E | 0.078 |
| Deuteranopia (no green cones) | #CBB745 | 0.080 |
| Tritanopia (no blue cones) | #A0BDAA | 0.138 |
| Achromatopsia (no color) | #B7B7B7 | 0.173 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #99C638
#99C638
oklch(76.8% 0.172 125.7)
- #CB99FF
#CB99FF
oklch(76.8% 0.15 305.7)
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 #99C638, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Yellow Green #9ACD32 ΔE 0.020
- Pea #A4BF20 ΔE 0.021
- Slime Green #99CC04 ΔE 0.028
- Bright Olive #9CBB04 ΔE 0.030
- Mustard Green #A8B504 ΔE 0.045
- Apple Green #76CD26 ΔE 0.045
- Apple #6ECB3C ΔE 0.045
- Light Olive Green #A4BE5C ΔE 0.046
Use #99C638 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.