#288E66
Closest named color: Viridian (#1E9167). oklch(57.9% 0.111 162.5), rgb(40, 142, 102).
Aa
Black text reads best on this color (5.15:1).
About this color
#288E66 is a medium-dark, moderately saturated green. In OKLCH its lightness is 58%, its chroma 0.111 and its hue 163°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Viridian (#1E9167), ΔE 0.009 away. Black text reads best on it, at 5.15:1.
| Hue family | Greens |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.111) |
| Temperature | in between |
| Nearest name | Viridian (#1E9167) |
| Black text | 5.15:1 |
| White text | 4.07:1 |
Values
| HEX | #288E66 |
| RGB | rgb(40, 142, 102) |
| HSL | hsl(156, 56%, 36%) |
| OKLCH | oklch(57.9% 0.111 162.5) |
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 #288E66 | 4.07:1 | AA large text | Lc -73.1 | Content text, not long reading |
| Black text on #288E66 | 5.15:1 | AA | Lc 36.5 | Non-text elements, placeholder text |
| #288E66 text on white | 4.07:1 | AA large text | Lc 67.6 | Content text, not long reading |
| #288E66 text on black | 5.15:1 | AA | Lc -34.1 | 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
#E2EDE7
oklch(93.6% 0.014 162.5)
-
Step 200
200
#CADFD4
oklch(88.5% 0.027 163.1)
-
Step 300
300
#A4CBB7
oklch(80.8% 0.05 162.8)
-
Step 400
400
#71B192
oklch(70.8% 0.08 162.4)
-
Step 500
500
#469D77
oklch(63.2% 0.103 162.5)
-
Step 600
600 (this color)
#288E66
oklch(57.9% 0.111 162.5)
-
Step 700
700
#0B724F
oklch(49% 0.103 162.9)
-
Step 800
800
#115D41
oklch(42.6% 0.085 162.9)
-
Step 900
900
#194C37
oklch(37.6% 0.066 162.9)
-
Step 950
950
#102D20
oklch(27% 0.043 162.1)
#288E66 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) | #8C8364 | 0.108 |
| Deuteranopia (no green cones) | #7E7A69 | 0.104 |
| Tritanopia (no blue cones) | #008E83 | 0.043 |
| Achromatopsia (no color) | #7E7E7E | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288E66
#288E66
oklch(57.9% 0.111 162.5)
- #A65E8C
#A65E8C
oklch(57.9% 0.11 342.2)
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 #288E66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Viridian #1E9167 ΔE 0.009
- Sea Green #2E8B57 ΔE 0.020
- Light Forest Green #4F9153 ΔE 0.039
- Ocean Green #3D9973 ΔE 0.039
- Dark Sage #598556 ΔE 0.043
- Fern Green #548D44 ΔE 0.049
- Slate Green #658D6D ΔE 0.056
- Dusty Teal #4C9085 ΔE 0.057
Use #288E66 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.