#128C39
Closest named color: Forest Green (#228B22). oklch(56% 0.157 147.9), rgb(18, 140, 57).
Aa
Black text reads best on this color (4.83:1).
About this color
#128C39 is a medium-dark, vivid green. In OKLCH its lightness is 56%, its chroma 0.157 and its hue 148°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Forest Green (#228B22), ΔE 0.019 away. Black text reads best on it, at 4.83:1.
| Hue family | Greens |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.157) |
| Temperature | in between |
| Nearest name | Forest Green (#228B22) |
| Black text | 4.83:1 |
| White text | 4.34:1 |
Values
| HEX | #128C39 |
| RGB | rgb(18, 140, 57) |
| HSL | hsl(139, 77%, 31%) |
| OKLCH | oklch(56% 0.157 147.9) |
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 #128C39 | 4.34:1 | AA large text | Lc -75.0 | Fine for body text |
| Black text on #128C39 | 4.83:1 | AA | Lc 34.6 | Non-text elements, placeholder text |
| #128C39 text on white | 4.34:1 | AA large text | Lc 69.5 | Content text, not long reading |
| #128C39 text on black | 4.83:1 | AA | Lc -32.2 | 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
#F1F7F2
oklch(97% 0.009 150.7)
-
Step 100
100
#E1EEE2
oklch(93.6% 0.021 147.6)
-
Step 200
200
#C9E1CB
oklch(88.6% 0.039 147.6)
-
Step 300
300
#A2CEA7
oklch(80.9% 0.071 147.9)
-
Step 400
400
#6DB478
oklch(70.7% 0.113 148)
-
Step 500
500
#40A054
oklch(63% 0.144 147.8)
-
Step 600
600 (this color)
#128C39
oklch(56% 0.157 147.9)
-
Step 700
700
#00752C
oklch(49% 0.142 148)
-
Step 800
800
#066024
oklch(42.8% 0.121 147.9)
-
Step 900
900
#144F22
oklch(37.8% 0.095 147.7)
-
Step 950
950
#0E2E15
oklch(27% 0.059 148.3)
#128C39 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) | #8E7F31 | 0.124 |
| Deuteranopia (no green cones) | #817640 | 0.123 |
| Tritanopia (no blue cones) | #00897A | 0.092 |
| Achromatopsia (no color) | #797979 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #128C39
#128C39
oklch(56% 0.157 147.9)
- #A34DA2
#A34DA2
oklch(55.9% 0.156 327.9)
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 #128C39, closest first.
No curated palette has a color within ΔE 0.04 of #128C39.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Forest Green #228B22 ΔE 0.019
- Kelley Green #009337 ΔE 0.022
- Emerald Green #028F1E ΔE 0.027
- Irish Green #019529 ΔE 0.034
- Jungle Green #048243 ΔE 0.037
- Dark Grass Green #388004 ΔE 0.041
- Sea Green #2E8B57 ΔE 0.042
- Tree Green #2A7E19 ΔE 0.042
Use #128C39 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.