#288666
Closest named color: Sea Green (#2E8B57). oklch(55.7% 0.101 166.1), rgb(40, 134, 102).
Aa
Black text reads best on this color (4.69:1).
About this color
#288666 is a medium-dark, moderately saturated green. In OKLCH its lightness is 56%, its chroma 0.101 and its hue 166°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Sea Green (#2E8B57), ΔE 0.030 away. Black text reads best on it, at 4.69:1.
| Hue family | Greens |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.101) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 4.69:1 |
| White text | 4.47:1 |
Values
| HEX | #288666 |
| RGB | rgb(40, 134, 102) |
| HSL | hsl(160, 54%, 34%) |
| OKLCH | oklch(55.7% 0.101 166.1) |
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 #288666 | 4.47:1 | AA large text | Lc -76.2 | Fine for body text |
| Black text on #288666 | 4.69:1 | AA | Lc 33.3 | Non-text elements, placeholder text |
| #288666 text on white | 4.47:1 | AA large text | Lc 70.7 | Content text, not long reading |
| #288666 text on black | 4.69:1 | AA | Lc -30.9 | 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
#F2F7F4
oklch(97.2% 0.007 160.1)
-
Step 100
100
#E2EDE8
oklch(93.6% 0.013 167.2)
-
Step 200
200
#CADFD5
oklch(88.5% 0.026 165.6)
-
Step 300
300
#A6CABA
oklch(80.8% 0.044 166.5)
-
Step 400
400
#74AF96
oklch(70.6% 0.072 166)
-
Step 500
500
#4B9B7D
oklch(63% 0.092 166.6)
-
Step 600
600 (this color)
#288666
oklch(55.7% 0.101 166.1)
-
Step 700
700
#187154
oklch(49% 0.094 165.9)
-
Step 800
800
#185C45
oklch(42.6% 0.077 166.2)
-
Step 900
900
#1C4C3A
oklch(37.8% 0.061 165.7)
-
Step 950
950
#122C22
oklch(26.9% 0.038 166.4)
#288666 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) | #837C64 | 0.100 |
| Deuteranopia (no green cones) | #767368 | 0.097 |
| Tritanopia (no blue cones) | #00867D | 0.035 |
| Achromatopsia (no color) | #777777 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288666
#288666
oklch(55.7% 0.101 166.1)
- #9D5A80
#9D5A80
oklch(55.6% 0.1 345.8)
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 #288666, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.030
- Viridian #1E9167 ΔE 0.033
- Dark Sage #598556 ΔE 0.043
- Teal #008080 ΔE 0.050
- Jungle Green #048243 ΔE 0.052
- Dark Cyan #008B8B ΔE 0.053
- Bluegreen #017A79 ΔE 0.057
- Light Forest Green #4F9153 ΔE 0.057
Use #288666 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.