#128C09
Closest named color: Emerald Green (#028F1E). oklch(55.7% 0.184 142.2), rgb(18, 140, 9).
Aa
Black text reads best on this color (4.78:1).
About this color
#128C09 is a medium-dark, vivid green. In OKLCH its lightness is 56%, its chroma 0.184 and its hue 142°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Emerald Green (#028F1E), ΔE 0.011 away. Black text reads best on it, at 4.78:1.
| Hue family | Greens |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.184) |
| Temperature | in between |
| Nearest name | Emerald Green (#028F1E) |
| Black text | 4.78:1 |
| White text | 4.39:1 |
Values
| HEX | #128C09 |
| RGB | rgb(18, 140, 9) |
| HSL | hsl(116, 88%, 29%) |
| OKLCH | oklch(55.7% 0.184 142.2) |
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 #128C09 | 4.39:1 | AA large text | Lc -75.3 | Fine for body text |
| Black text on #128C09 | 4.78:1 | AA | Lc 34.3 | Non-text elements, placeholder text |
| #128C09 text on white | 4.39:1 | AA large text | Lc 69.8 | Content text, not long reading |
| #128C09 text on black | 4.78:1 | AA | Lc -31.9 | Non-text elements, placeholder 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 600.
-
Step 50
50
#F1F7F1
oklch(97% 0.01 145.5)
-
Step 100
100
#E1EEE0
oklch(93.6% 0.023 143.4)
-
Step 200
200
#C9E1C6
oklch(88.5% 0.045 142.1)
-
Step 300
300
#A2CF9D
oklch(80.9% 0.084 142.2)
-
Step 400
400
#6DB566
oklch(70.6% 0.133 142.1)
-
Step 500
500
#40A239
oklch(63.2% 0.17 142.2)
-
Step 600
600 (this color)
#128C09
oklch(55.7% 0.184 142.2)
-
Step 700
700
#067600
oklch(49.1% 0.166 142.2)
-
Step 800
800
#086103
oklch(42.8% 0.142 142.2)
-
Step 900
900
#154F11
oklch(37.6% 0.11 142.2)
-
Step 950
950
#0E2F0C
oklch(27.1% 0.071 142.4)
#128C09 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) | #8F7E00 | 0.129 |
| Deuteranopia (no green cones) | #83751F | 0.128 |
| Tritanopia (no blue cones) | #008776 | 0.121 |
| Achromatopsia (no color) | #787878 | 0.185 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #128C09
#128C09
oklch(55.7% 0.184 142.2)
- #A344B1
#A344B1
oklch(55.6% 0.184 322.3)
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 #128C09, closest first.
No curated palette has a color within ΔE 0.04 of #128C09.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Emerald Green #028F1E ΔE 0.011
- Forest Green #228B22 ΔE 0.016
- True Green #089404 ΔE 0.024
- Irish Green #019529 ΔE 0.028
- Kelley Green #009337 ΔE 0.031
- Green #008000 ΔE 0.038
- Dark Grass Green #388004 ΔE 0.038
- Tree Green #2A7E19 ΔE 0.044
Use #128C09 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.