#288D5B
Closest named color: Sea Green (#2E8B57). oklch(57.3% 0.12 157.1), rgb(40, 141, 91).
Aa
Black text reads best on this color (5.05:1).
About this color
#288D5B is a medium-dark, moderately saturated green. In OKLCH its lightness is 57%, its chroma 0.120 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 0.007 away. Black text reads best on it, at 5.05:1.
| Hue family | Greens |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.120) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 5.05:1 |
| White text | 4.15:1 |
Values
| HEX | #288D5B |
| RGB | rgb(40, 141, 91) |
| HSL | hsl(150, 56%, 35%) |
| OKLCH | oklch(57.3% 0.12 157.1) |
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 #288D5B | 4.15:1 | AA large text | Lc -73.8 | Content text, not long reading |
| Black text on #288D5B | 5.05:1 | AA | Lc 35.8 | Non-text elements, placeholder text |
| #288D5B text on white | 4.15:1 | AA large text | Lc 68.3 | Content text, not long reading |
| #288D5B text on black | 5.05:1 | AA | Lc -33.4 | 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
#F2F7F3
oklch(97.1% 0.007 151.9)
-
Step 100
100
#E2EDE6
oklch(93.6% 0.015 158.2)
-
Step 200
200
#CADFD1
oklch(88.4% 0.029 156.6)
-
Step 300
300
#A5CCB3
oklch(81% 0.054 156.9)
-
Step 400
400
#71B18B
oklch(70.6% 0.087 157.2)
-
Step 500
500
#479D6E
oklch(63% 0.11 157.1)
-
Step 600
600 (this color)
#288D5B
oklch(57.3% 0.12 157.1)
-
Step 700
700
#0F7346
oklch(49.1% 0.112 157)
-
Step 800
800
#135E3A
oklch(42.8% 0.093 157)
-
Step 900
900
#194D32
oklch(37.7% 0.072 157.3)
-
Step 950
950
#112D1D
oklch(27% 0.046 156.4)
#288D5B 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) | #8C8258 | 0.109 |
| Deuteranopia (no green cones) | #7F795E | 0.106 |
| Tritanopia (no blue cones) | #008C80 | 0.055 |
| Achromatopsia (no color) | #7C7C7C | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288D5B
#288D5B
oklch(57.3% 0.12 157.1)
- #A45A92
#A45A92
oklch(57.2% 0.121 336.8)
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 #288D5B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.007
- Viridian #1E9167 ΔE 0.017
- Light Forest Green #4F9153 ΔE 0.034
- Fern Green #548D44 ΔE 0.040
- Dark Sage #598556 ΔE 0.043
- Jungle Green #048243 ΔE 0.046
- Ocean Green #3D9973 ΔE 0.048
- Kelley Green #009337 ΔE 0.055
Use #288D5B 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.