#128B58
Closest named color: Sea Green (#2E8B57). oklch(56.3% 0.127 158.2), rgb(18, 139, 88).
Aa
Black text reads best on this color (4.85:1).
About this color
#128B58 is a medium-dark, moderately saturated green. In OKLCH its lightness is 56%, its chroma 0.127 and its hue 158°. 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 4.85:1.
| Hue family | Greens |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.127) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 4.85:1 |
| White text | 4.32:1 |
Values
| HEX | #128B58 |
| RGB | rgb(18, 139, 88) |
| HSL | hsl(155, 77%, 31%) |
| OKLCH | oklch(56.3% 0.127 158.2) |
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 #128B58 | 4.32:1 | AA large text | Lc -74.9 | Content text, not long reading |
| Black text on #128B58 | 4.85:1 | AA | Lc 34.7 | Non-text elements, placeholder text |
| #128B58 text on white | 4.32:1 | AA large text | Lc 69.4 | Content text, not long reading |
| #128B58 text on black | 4.85:1 | AA | Lc -32.3 | 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
#E1EDE6
oklch(93.5% 0.016 160.6)
-
Step 200
200
#C9E0D1
oklch(88.5% 0.032 157.1)
-
Step 300
300
#A2CCB3
oklch(80.8% 0.057 158.7)
-
Step 400
400
#6DB28B
oklch(70.7% 0.091 158.2)
-
Step 500
500
#3F9E6E
oklch(63% 0.116 158.3)
-
Step 600
600 (this color)
#128B58
oklch(56.3% 0.127 158.2)
-
Step 700
700
#007447
oklch(49.2% 0.115 158)
-
Step 800
800
#055E3A
oklch(42.6% 0.097 158.5)
-
Step 900
900
#144D32
oklch(37.6% 0.075 158.6)
-
Step 950
950
#0E2D1D
oklch(26.8% 0.048 158.2)
#128B58 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) | #8A7F55 | 0.117 |
| Deuteranopia (no green cones) | #7C765B | 0.113 |
| Tritanopia (no blue cones) | #008A7E | 0.057 |
| Achromatopsia (no color) | #7A7A7A | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #128B58
#128B58
oklch(56.3% 0.127 158.2)
- #A4558F
#A4558F
oklch(56.3% 0.127 338.1)
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 #128B58, 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 0.045
- Fern Green #548D44 ΔE 0.047
- Dark Sage #598556 ΔE 0.050
- Kelley Green #009337 ΔE 0.053
- Forest Green #228B22 ΔE 0.058
Use #128B58 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.