#128B4B
Closest named color: Sea Green (#2E8B57). oklch(56% 0.139 153), rgb(18, 139, 75).
Aa
Black text reads best on this color (4.82:1).
About this color
#128B4B is a medium-dark, moderately saturated green. In OKLCH its lightness is 56%, its chroma 0.139 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 0.022 away. Black text reads best on it, at 4.82:1.
| Hue family | Greens |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.139) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 4.82:1 |
| White text | 4.35:1 |
Values
| HEX | #128B4B |
| RGB | rgb(18, 139, 75) |
| HSL | hsl(148, 77%, 31%) |
| OKLCH | oklch(56% 0.139 153) |
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 #128B4B | 4.35:1 | AA large text | Lc -75.1 | Fine for body text |
| Black text on #128B4B | 4.82:1 | AA | Lc 34.4 | Non-text elements, placeholder text |
| #128B4B text on white | 4.35:1 | AA large text | Lc 69.7 | Content text, not long reading |
| #128B4B text on black | 4.82:1 | AA | Lc -32.0 | 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
#C9E0CE
oklch(88.5% 0.035 152)
-
Step 300
300
#A3CDAE
oklch(81% 0.062 152.9)
-
Step 400
400
#6DB383
oklch(70.7% 0.1 153.2)
-
Step 500
500
#409F63
oklch(63% 0.128 153)
-
Step 600
600 (this color)
#128B4B
oklch(56% 0.139 153)
-
Step 700
700
#00743C
oklch(49% 0.126 153.1)
-
Step 800
800
#065F31
oklch(42.7% 0.107 153.1)
-
Step 900
900
#144E2B
oklch(37.7% 0.084 152.8)
-
Step 950
950
#0E2E1A
oklch(27.1% 0.053 153.4)
#128B4B 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) | #8B7F46 | 0.119 |
| Deuteranopia (no green cones) | #7E754F | 0.118 |
| Tritanopia (no blue cones) | #00897C | 0.073 |
| Achromatopsia (no color) | #797979 | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #128B4B
#128B4B
oklch(56% 0.139 153)
- #A35297
#A35297
oklch(56.1% 0.138 333.1)
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 #128B4B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.022
- Jungle Green #048243 ΔE 0.028
- Kelley Green #009337 ΔE 0.038
- Viridian #1E9167 ΔE 0.039
- Forest Green #228B22 ΔE 0.040
- Fern Green #548D44 ΔE 0.044
- Light Forest Green #4F9153 ΔE 0.047
- Emerald Green #028F1E ΔE 0.049
Use #128B4B 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.