#128C56
Closest named color: Sea Green (#2E8B57). oklch(56.5% 0.13 157), rgb(18, 140, 86).
Aa
Black text reads best on this color (4.91:1).
About this color
#128C56 is a medium-dark, moderately saturated green. In OKLCH its lightness is 57%, its chroma 0.130 and its hue 157°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Sea Green (#2E8B57), ΔE 0.012 away. Black text reads best on it, at 4.91:1.
| Hue family | Greens |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.130) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 4.91:1 |
| White text | 4.27:1 |
Values
| HEX | #128C56 |
| RGB | rgb(18, 140, 86) |
| HSL | hsl(153, 77%, 31%) |
| OKLCH | oklch(56.5% 0.13 157) |
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 #128C56 | 4.27:1 | AA large text | Lc -74.5 | Content text, not long reading |
| Black text on #128C56 | 4.91:1 | AA | Lc 35.0 | Non-text elements, placeholder text |
| #128C56 text on white | 4.27:1 | AA large text | Lc 69.1 | Content text, not long reading |
| #128C56 text on black | 4.91:1 | AA | Lc -32.6 | 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
#F1F7F3
oklch(97.1% 0.008 157.1)
-
Step 100
100
#E1EDE5
oklch(93.5% 0.017 156.9)
-
Step 200
200
#C9E0D1
oklch(88.5% 0.032 157.1)
-
Step 300
300
#A2CDB2
oklch(81% 0.059 157.2)
-
Step 400
400
#6DB289
oklch(70.6% 0.093 156.9)
-
Step 500
500
#3F9F6C
oklch(63.2% 0.119 157)
-
Step 600
600 (this color)
#128C56
oklch(56.5% 0.13 157)
-
Step 700
700
#007445
oklch(49.2% 0.117 157)
-
Step 800
800
#045F38
oklch(42.8% 0.1 156.9)
-
Step 900
900
#134E30
oklch(37.8% 0.079 156.6)
-
Step 950
950
#0E2E1D
oklch(27.2% 0.05 157.3)
#128C56 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) | #8B8052 | 0.118 |
| Deuteranopia (no green cones) | #7D765A | 0.116 |
| Tritanopia (no blue cones) | #008B7E | 0.060 |
| Achromatopsia (no color) | #7A7A7A | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #128C56
#128C56
oklch(56.5% 0.13 157)
- #A55592
#A55592
oklch(56.6% 0.13 336.9)
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 #128C56, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.012
- Viridian #1E9167 ΔE 0.026
- Jungle Green #048243 ΔE 0.035
- Light Forest Green #4F9153 ΔE 0.043
- Fern Green #548D44 ΔE 0.045
- Kelley Green #009337 ΔE 0.048
- Dark Sage #598556 ΔE 0.052
- Forest Green #228B22 ΔE 0.054
Use #128C56 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.