#288B4B
Closest named color: Sea Green (#2E8B57). oklch(56.4% 0.133 151), rgb(40, 139, 75).
Aa
Black text reads best on this color (4.88:1).
About this color
#288B4B is a medium-dark, moderately saturated green. In OKLCH its lightness is 56%, its chroma 0.133 and its hue 151°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Sea Green (#2E8B57), ΔE 0.017 away. Black text reads best on it, at 4.88:1.
| Hue family | Greens |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.133) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 4.88:1 |
| White text | 4.29:1 |
Values
| HEX | #288B4B |
| RGB | rgb(40, 139, 75) |
| HSL | hsl(141, 55%, 35%) |
| OKLCH | oklch(56.4% 0.133 151) |
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 #288B4B | 4.29:1 | AA large text | Lc -74.9 | Content text, not long reading |
| Black text on #288B4B | 4.88:1 | AA | Lc 34.7 | Non-text elements, placeholder text |
| #288B4B text on white | 4.29:1 | AA large text | Lc 69.4 | Content text, not long reading |
| #288B4B text on black | 4.88:1 | 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
#F2F7F3
oklch(97.1% 0.007 151.9)
-
Step 100
100
#E2EDE4
oklch(93.5% 0.017 151.1)
-
Step 200
200
#CAE0CE
oklch(88.5% 0.034 150.8)
-
Step 300
300
#A5CCAD
oklch(80.8% 0.06 151)
-
Step 400
400
#73B282
oklch(70.8% 0.096 150.9)
-
Step 500
500
#499E62
oklch(63.1% 0.122 151)
-
Step 600
600 (this color)
#288B4B
oklch(56.4% 0.133 151)
-
Step 700
700
#14743A
oklch(49.2% 0.124 151.1)
-
Step 800
800
#165E30
oklch(42.7% 0.102 151)
-
Step 900
900
#1B4D2B
oklch(37.6% 0.079 151.2)
-
Step 950
950
#112D19
oklch(26.9% 0.051 151)
#288B4B 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) | #8C7F46 | 0.112 |
| Deuteranopia (no green cones) | #7F774F | 0.108 |
| Tritanopia (no blue cones) | #00897C | 0.072 |
| Achromatopsia (no color) | #7A7A7A | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288B4B
#288B4B
oklch(56.4% 0.133 151)
- #A15599
#A15599
oklch(56.4% 0.133 331.2)
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 #288B4B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.017
- Jungle Green #048243 ΔE 0.033
- Viridian #1E9167 ΔE 0.036
- Fern Green #548D44 ΔE 0.036
- Light Forest Green #4F9153 ΔE 0.039
- Kelley Green #009337 ΔE 0.040
- Forest Green #228B22 ΔE 0.042
- Dark Sage #598556 ΔE 0.050
Use #288B4B 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.