#288C53
Closest named color: Sea Green (#2E8B57). oklch(56.9% 0.126 153.8), rgb(40, 140, 83).
Aa
Black text reads best on this color (4.96:1).
About this color
#288C53 is a medium-dark, moderately saturated green. In OKLCH its lightness is 57%, its chroma 0.126 and its hue 154°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Sea Green (#2E8B57), ΔE 0.008 away. Black text reads best on it, at 4.96:1.
| Hue family | Greens |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.126) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 4.96:1 |
| White text | 4.22:1 |
Values
| HEX | #288C53 |
| RGB | rgb(40, 140, 83) |
| HSL | hsl(146, 56%, 35%) |
| OKLCH | oklch(56.9% 0.126 153.8) |
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 #288C53 | 4.22:1 | AA large text | Lc -74.3 | Content text, not long reading |
| Black text on #288C53 | 4.96:1 | AA | Lc 35.3 | Non-text elements, placeholder text |
| #288C53 text on white | 4.22:1 | AA large text | Lc 68.8 | Content text, not long reading |
| #288C53 text on black | 4.96:1 | 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
#E2EDE5
oklch(93.6% 0.016 154.5)
-
Step 200
200
#CAE0D0
oklch(88.6% 0.032 154.1)
-
Step 300
300
#A5CCB0
oklch(80.9% 0.057 153.8)
-
Step 400
400
#72B186
oklch(70.6% 0.091 153.7)
-
Step 500
500
#489E68
oklch(63.2% 0.117 153.8)
-
Step 600
600 (this color)
#288C53
oklch(56.9% 0.126 153.8)
-
Step 700
700
#127340
oklch(49% 0.117 153.9)
-
Step 800
800
#155E35
oklch(42.7% 0.097 153.7)
-
Step 900
900
#1A4D2E
oklch(37.7% 0.076 153.7)
-
Step 950
950
#112D1B
oklch(26.9% 0.048 153.5)
#288C53 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) | #8C804F | 0.111 |
| Deuteranopia (no green cones) | #7F7857 | 0.107 |
| Tritanopia (no blue cones) | #008A7E | 0.065 |
| Achromatopsia (no color) | #7B7B7B | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288C53
#288C53
oklch(56.9% 0.126 153.8)
- #A35896
#A35896
oklch(57% 0.127 333.9)
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 #288C53, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.008
- Viridian #1E9167 ΔE 0.026
- Light Forest Green #4F9153 ΔE 0.035
- Fern Green #548D44 ΔE 0.037
- Jungle Green #048243 ΔE 0.038
- Dark Sage #598556 ΔE 0.045
- Kelley Green #009337 ΔE 0.047
- Forest Green #228B22 ΔE 0.052
Use #288C53 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.