#66B166
Closest named color: Boring Green (#63B365). oklch(69.3% 0.131 144), rgb(102, 177, 102).
Aa
Black text reads best on this color (8.04:1).
About this color
#66B166 is a medium-light, moderately saturated green. In OKLCH its lightness is 69%, its chroma 0.131 and its hue 144°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Boring Green (#63B365), ΔE 0.007 away. Black text reads best on it, at 8.04:1.
| Hue family | Greens |
| Lightness | medium-light (69%) |
| Chroma | moderately saturated (0.131) |
| Temperature | in between |
| Nearest name | Boring Green (#63B365) |
| Black text | 8.04:1 |
| White text | 2.61:1 |
Values
| HEX | #66B166 |
| RGB | rgb(102, 177, 102) |
| HSL | hsl(120, 32%, 55%) |
| OKLCH | oklch(69.3% 0.131 144) |
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 #66B166 | 2.61:1 | Fails | Lc -55.9 | Large or bold text, headings |
| Black text on #66B166 | 8.04:1 | AAA | Lc 53.2 | Large or bold text, headings |
| #66B166 text on white | 2.61:1 | Fails | Lc 50.8 | Large or bold text, headings |
| #66B166 text on black | 8.04:1 | AAA | Lc -51.1 | Large or bold text, headings |
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 400.
-
Step 50
50
#F1F7F1
oklch(97% 0.01 145.5)
-
Step 100
100
#E1EEE0
oklch(93.6% 0.023 143.4)
-
Step 200
200
#C8E1C7
oklch(88.4% 0.044 144.2)
-
Step 300
300
#A1CF9F
oklch(80.9% 0.082 143.7)
-
Step 400
400 (this color)
#66B166
oklch(69.3% 0.131 144)
-
Step 500
500
#3BA240
oklch(63.1% 0.166 144)
-
Step 600
600
#008C1B
oklch(55.6% 0.18 144)
-
Step 700
700
#007615
oklch(49.1% 0.159 144)
-
Step 800
800
#00610F
oklch(42.8% 0.139 144)
-
Step 900
900
#114F15
oklch(37.6% 0.108 143.9)
-
Step 950
950
#0D2F0E
oklch(27.1% 0.069 143.8)
#66B166 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) | #B4A560 | 0.099 |
| Deuteranopia (no green cones) | #A99D6B | 0.099 |
| Tritanopia (no blue cones) | #5DAD9F | 0.082 |
| Achromatopsia (no color) | #A0A0A0 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66B166
#66B166
oklch(69.3% 0.131 144)
- #C47FCA
#C47FCA
oklch(69.4% 0.131 324)
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 #66B166, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Boring Green #63B365 ΔE 0.007
- Asparagus #77AB56 ΔE 0.023
- Algae #54AC68 ΔE 0.024
- Dark Pastel Green #56AE57 ΔE 0.026
- Fern #63A950 ΔE 0.030
- Faded Green #7BB274 ΔE 0.031
- Medium Sea Green #3CB371 ΔE 0.031
- Dull Green #74A662 ΔE 0.032
Use #66B166 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.