#288C50
Closest named color: Sea Green (#2E8B57). oklch(56.8% 0.129 152.7), rgb(40, 140, 80).
Aa
Black text reads best on this color (4.95:1).
About this color
#288C50 is a medium-dark, moderately saturated green. In OKLCH its lightness is 57%, its chroma 0.129 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 0.012 away. Black text reads best on it, at 4.95:1.
| Hue family | Greens |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.129) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 4.95:1 |
| White text | 4.23:1 |
Values
| HEX | #288C50 |
| RGB | rgb(40, 140, 80) |
| HSL | hsl(144, 56%, 35%) |
| OKLCH | oklch(56.8% 0.129 152.7) |
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 #288C50 | 4.23:1 | AA large text | Lc -74.4 | Content text, not long reading |
| Black text on #288C50 | 4.95:1 | AA | Lc 35.2 | Non-text elements, placeholder text |
| #288C50 text on white | 4.23:1 | AA large text | Lc 68.9 | Content text, not long reading |
| #288C50 text on black | 4.95:1 | AA | Lc -32.8 | 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
#CAE0CF
oklch(88.6% 0.033 152.4)
-
Step 300
300
#A5CCAF
oklch(80.9% 0.058 152.8)
-
Step 400
400
#72B285
oklch(70.8% 0.093 152.9)
-
Step 500
500
#489E66
oklch(63.1% 0.119 152.9)
-
Step 600
600 (this color)
#288C50
oklch(56.8% 0.129 152.7)
-
Step 700
700
#12733D
oklch(49% 0.12 152.6)
-
Step 800
800
#155E33
oklch(42.7% 0.099 152.6)
-
Step 900
900
#1A4D2D
oklch(37.6% 0.077 153)
-
Step 950
950
#112D1A
oklch(26.9% 0.049 152.2)
#288C50 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) | #8C804C | 0.111 |
| Deuteranopia (no green cones) | #807754 | 0.110 |
| Tritanopia (no blue cones) | #008A7D | 0.067 |
| Achromatopsia (no color) | #7B7B7B | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288C50
#288C50
oklch(56.8% 0.129 152.7)
- #A25798
#A25798
oklch(56.8% 0.13 332.2)
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 #288C50, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.012
- Viridian #1E9167 ΔE 0.030
- Fern Green #548D44 ΔE 0.036
- Light Forest Green #4F9153 ΔE 0.036
- Jungle Green #048243 ΔE 0.037
- Kelley Green #009337 ΔE 0.043
- Dark Sage #598556 ΔE 0.047
- Forest Green #228B22 ΔE 0.048
Use #288C50 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.