#66AD4E
Closest named color: Fern (#63A950). oklch(67.9% 0.148 138.4), rgb(102, 173, 78).
Aa
Black text reads best on this color (7.65:1).
About this color
#66AD4E is a medium-light, vivid green. In OKLCH its lightness is 68%, its chroma 0.148 and its hue 138°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Fern (#63A950), ΔE 0.013 away. Black text reads best on it, at 7.65:1.
| Hue family | Greens |
| Lightness | medium-light (68%) |
| Chroma | vivid (0.148) |
| Temperature | in between |
| Nearest name | Fern (#63A950) |
| Black text | 7.65:1 |
| White text | 2.74:1 |
Values
| HEX | #66AD4E |
| RGB | rgb(102, 173, 78) |
| HSL | hsl(105, 38%, 49%) |
| OKLCH | oklch(67.9% 0.148 138.4) |
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 #66AD4E | 2.74:1 | Fails | Lc -58.1 | Large or bold text, headings |
| Black text on #66AD4E | 7.65:1 | AAA | Lc 51.2 | Large or bold text, headings |
| #66AD4E text on white | 2.74:1 | Fails | Lc 52.9 | Large or bold text, headings |
| #66AD4E text on black | 7.65:1 | AAA | Lc -49.0 | 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
#F1F8F0
oklch(97.2% 0.013 141.8)
-
Step 100
100
#E1EEDD
oklch(93.5% 0.026 138.3)
-
Step 200
200
#C9E2C1
oklch(88.6% 0.052 138.1)
-
Step 300
300
#A3CF95
oklch(80.8% 0.092 138.3)
-
Step 400
400 (this color)
#66AD4E
oklch(67.9% 0.148 138.4)
-
Step 500
500
#43A214
oklch(63% 0.189 138.4)
-
Step 600
600
#348900
oklch(55.6% 0.173 138.4)
-
Step 700
700
#2A7300
oklch(49% 0.153 138.4)
-
Step 800
800
#215F00
oklch(42.8% 0.134 138.5)
-
Step 900
900
#1A4F00
oklch(37.7% 0.118 138.5)
-
Step 950
950
#0F2F03
oklch(27.1% 0.079 138.5)
#66AD4E 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) | #B2A045 | 0.099 |
| Deuteranopia (no green cones) | #A89A55 | 0.098 |
| Tritanopia (no blue cones) | #62A898 | 0.102 |
| Achromatopsia (no color) | #9C9C9C | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66AD4E
#66AD4E
oklch(67.9% 0.148 138.4)
- #BE78D2
#BE78D2
oklch(67.9% 0.148 318.5)
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 #66AD4E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Fern #63A950 ΔE 0.013
- Dark Pastel Green #56AE57 ΔE 0.015
- Leaf #71AA34 ΔE 0.022
- Asparagus #77AB56 ΔE 0.023
- Boring Green #63B365 ΔE 0.026
- Mid Green #50A747 ΔE 0.030
- Off Green #6BA353 ΔE 0.031
- Grass #5CAC2D ΔE 0.032
Use #66AD4E 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.