#66B040
Closest named color: Leaf (#71AA34). oklch(68.5% 0.164 136.6), rgb(102, 176, 64).
Aa
Black text reads best on this color (7.84:1).
About this color
#66B040 is a medium-light, vivid green. In OKLCH its lightness is 69%, its chroma 0.164 and its hue 137°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Leaf (#71AA34), ΔE 0.018 away. Black text reads best on it, at 7.84:1.
| Hue family | Greens |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.164) |
| Temperature | in between |
| Nearest name | Leaf (#71AA34) |
| Black text | 7.84:1 |
| White text | 2.67:1 |
Values
| HEX | #66B040 |
| RGB | rgb(102, 176, 64) |
| HSL | hsl(100, 47%, 47%) |
| OKLCH | oklch(68.5% 0.164 136.6) |
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 #66B040 | 2.67:1 | Fails | Lc -57.0 | Large or bold text, headings |
| Black text on #66B040 | 7.84:1 | AAA | Lc 52.3 | Large or bold text, headings |
| #66B040 text on white | 2.67:1 | Fails | Lc 51.8 | Large or bold text, headings |
| #66B040 text on black | 7.84:1 | AAA | Lc -50.1 | 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
#F1F8EF
oklch(97.1% 0.014 138.7)
-
Step 100
100
#E1EFDB
oklch(93.6% 0.03 136.1)
-
Step 200
200
#C8E2BD
oklch(88.4% 0.057 136.4)
-
Step 300
300
#A2D08E
oklch(80.8% 0.102 136.5)
-
Step 400
400 (this color)
#66B040
oklch(68.5% 0.164 136.6)
-
Step 500
500
#4AA100
oklch(63% 0.19 136.6)
-
Step 600
600
#3D8800
oklch(55.6% 0.168 136.7)
-
Step 700
700
#337200
oklch(49.1% 0.147 136.5)
-
Step 800
800
#285E00
oklch(42.8% 0.129 136.7)
-
Step 900
900
#204E00
oklch(37.6% 0.113 136.7)
-
Step 950
950
#112F00
oklch(27.1% 0.081 136.5)
#66B040 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) | #B6A233 | 0.104 |
| Deuteranopia (no green cones) | #AC9C49 | 0.104 |
| Tritanopia (no blue cones) | #63AA99 | 0.117 |
| Achromatopsia (no color) | #9E9E9E | 0.165 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66B040
#66B040
oklch(68.5% 0.164 136.6)
- #C176DD
#C176DD
oklch(68.5% 0.164 316.3)
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 #66B040, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Leaf #71AA34 ΔE 0.018
- Grass #5CAC2D ΔE 0.021
- Dark Pastel Green #56AE57 ΔE 0.027
- Leafy Green #51B73B ΔE 0.027
- Fern #63A950 ΔE 0.029
- Turtle Green #75B84F ΔE 0.031
- Mid Green #50A747 ΔE 0.036
- Asparagus #77AB56 ΔE 0.036
Use #66B040 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.