#128F4B
Closest named color: Sea Green (#2E8B57). oklch(57.1% 0.144 152.3), rgb(18, 143, 75).
Aa
Black text reads best on this color (5.05:1).
About this color
#128F4B is a medium-dark, vivid green. In OKLCH its lightness is 57%, its chroma 0.144 and its hue 152°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Sea Green (#2E8B57), ΔE 0.026 away. Black text reads best on it, at 5.05:1.
| Hue family | Greens |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.144) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 5.05:1 |
| White text | 4.15:1 |
Values
| HEX | #128F4B |
| RGB | rgb(18, 143, 75) |
| HSL | hsl(147, 78%, 32%) |
| OKLCH | oklch(57.1% 0.144 152.3) |
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 #128F4B | 4.15:1 | AA large text | Lc -73.5 | Content text, not long reading |
| Black text on #128F4B | 5.05:1 | AA | Lc 36.0 | Non-text elements, placeholder text |
| #128F4B text on white | 4.15:1 | AA large text | Lc 68.0 | Content text, not long reading |
| #128F4B text on black | 5.05:1 | 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
#A2CDAC
oklch(80.8% 0.065 151.8)
-
Step 400
400
#6CB381
oklch(70.6% 0.103 152.5)
-
Step 500
500
#3DA060
oklch(63.1% 0.133 152.1)
-
Step 600
600 (this color)
#128F4B
oklch(57.1% 0.144 152.3)
-
Step 700
700
#00743A
oklch(49% 0.128 152.4)
-
Step 800
800
#015F2F
oklch(42.6% 0.11 152.6)
-
Step 900
900
#124E2A
oklch(37.6% 0.086 152.6)
-
Step 950
950
#0D2E19
oklch(27% 0.055 152.8)
#128F4B 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) | #8F8246 | 0.123 |
| Deuteranopia (no green cones) | #827950 | 0.121 |
| Tritanopia (no blue cones) | #008D7F | 0.076 |
| Achromatopsia (no color) | #7C7C7C | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #128F4B
#128F4B
oklch(57.1% 0.144 152.3)
- #A8539D
#A8539D
oklch(57.2% 0.145 332.4)
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 #128F4B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.026
- Kelley Green #009337 ΔE 0.029
- Forest Green #228B22 ΔE 0.038
- Viridian #1E9167 ΔE 0.038
- Jungle Green #048243 ΔE 0.040
- Fern Green #548D44 ΔE 0.041
- Light Forest Green #4F9153 ΔE 0.042
- Irish Green #019529 ΔE 0.044
Use #128F4B 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.