#288C57
Closest named color: Sea Green (#2E8B57). oklch(57% 0.123 155.5), rgb(40, 140, 87).
Aa
Black text reads best on this color (4.97:1).
About this color
#288C57 is a medium-dark, moderately saturated green. In OKLCH its lightness is 57%, its chroma 0.123 and its hue 156°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Sea Green (#2E8B57), ΔE 0.004 away. Black text reads best on it, at 4.97:1.
| Hue family | Greens |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.123) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 4.97:1 |
| White text | 4.21:1 |
Values
| HEX | #288C57 |
| RGB | rgb(40, 140, 87) |
| HSL | hsl(148, 56%, 35%) |
| OKLCH | oklch(57% 0.123 155.5) |
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 #288C57 | 4.21:1 | AA large text | Lc -74.2 | Content text, not long reading |
| Black text on #288C57 | 4.97:1 | AA | Lc 35.3 | Non-text elements, placeholder text |
| #288C57 text on white | 4.21:1 | AA large text | Lc 68.7 | Content text, not long reading |
| #288C57 text on black | 4.97:1 | AA | Lc -32.9 | 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
#E2EDE5
oklch(93.6% 0.016 154.5)
-
Step 200
200
#CAE0D1
oklch(88.6% 0.031 155.9)
-
Step 300
300
#A5CCB2
oklch(81% 0.055 155.8)
-
Step 400
400
#72B189
oklch(70.6% 0.088 155.6)
-
Step 500
500
#489D6C
oklch(63% 0.112 155.9)
-
Step 600
600 (this color)
#288C57
oklch(57% 0.123 155.5)
-
Step 700
700
#117344
oklch(49.1% 0.113 155.8)
-
Step 800
800
#145E38
oklch(42.8% 0.095 155.6)
-
Step 900
900
#1A4D30
oklch(37.7% 0.074 155.3)
-
Step 950
950
#112D1C
oklch(27% 0.047 154.9)
#288C57 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) | #8B8153 | 0.109 |
| Deuteranopia (no green cones) | #7F785A | 0.107 |
| Tritanopia (no blue cones) | #008B7E | 0.058 |
| Achromatopsia (no color) | #7B7B7B | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288C57
#288C57
oklch(57% 0.123 155.5)
- #A35993
#A35993
oklch(57% 0.122 335.7)
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 #288C57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.004
- Viridian #1E9167 ΔE 0.022
- Light Forest Green #4F9153 ΔE 0.035
- Fern Green #548D44 ΔE 0.039
- Jungle Green #048243 ΔE 0.041
- Dark Sage #598556 ΔE 0.043
- Kelley Green #009337 ΔE 0.052
- Ocean Green #3D9973 ΔE 0.053
Use #288C57 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.