#128F4D
Closest named color: Sea Green (#2E8B57). oklch(57.2% 0.142 152.9), rgb(18, 143, 77).
Aa
Black text reads best on this color (5.06:1).
About this color
#128F4D is a medium-dark, vivid green. In OKLCH its lightness is 57%, its chroma 0.142 and its hue 153°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Sea Green (#2E8B57), ΔE 0.024 away. Black text reads best on it, at 5.06:1.
| Hue family | Greens |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.142) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 5.06:1 |
| White text | 4.14:1 |
Values
| HEX | #128F4D |
| RGB | rgb(18, 143, 77) |
| HSL | hsl(148, 78%, 32%) |
| OKLCH | oklch(57.2% 0.142 152.9) |
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 #128F4D | 4.14:1 | AA large text | Lc -73.5 | Content text, not long reading |
| Black text on #128F4D | 5.06:1 | AA | Lc 36.1 | Non-text elements, placeholder text |
| #128F4D text on white | 4.14:1 | AA large text | Lc 68.0 | Content text, not long reading |
| #128F4D text on black | 5.06:1 | AA | Lc -33.6 | 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
#E1EEE4
oklch(93.7% 0.019 152.8)
-
Step 200
200
#C8E0CE
oklch(88.4% 0.035 153.2)
-
Step 300
300
#A2CDAD
oklch(80.9% 0.064 152.7)
-
Step 400
400
#6CB382
oklch(70.6% 0.102 153)
-
Step 500
500
#3DA062
oklch(63.2% 0.131 152.9)
-
Step 600
600 (this color)
#128F4D
oklch(57.2% 0.142 152.9)
-
Step 700
700
#00743C
oklch(49% 0.126 153.1)
-
Step 800
800
#015F30
oklch(42.6% 0.109 153)
-
Step 900
900
#124E2B
oklch(37.6% 0.085 153.3)
-
Step 950
950
#0D2E19
oklch(27% 0.055 152.8)
#128F4D 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) | #8F8248 | 0.122 |
| Deuteranopia (no green cones) | #827952 | 0.120 |
| Tritanopia (no blue cones) | #008D7F | 0.074 |
| Achromatopsia (no color) | #7C7C7C | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #128F4D
#128F4D
oklch(57.2% 0.142 152.9)
- #A8549C
#A8549C
oklch(57.3% 0.143 332.9)
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 #128F4D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.024
- Kelley Green #009337 ΔE 0.031
- Viridian #1E9167 ΔE 0.036
- Jungle Green #048243 ΔE 0.040
- Forest Green #228B22 ΔE 0.040
- Fern Green #548D44 ΔE 0.041
- Light Forest Green #4F9153 ΔE 0.041
- Irish Green #019529 ΔE 0.046
Use #128F4D 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.