#66A548
Closest named color: Fern (#63A950). oklch(65.8% 0.142 136.7), rgb(102, 165, 72).
Aa
Black text reads best on this color (7.04:1).
About this color
#66A548 is a medium-light, vivid green. In OKLCH its lightness is 66%, its chroma 0.142 and its hue 137°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Fern (#63A950), ΔE 0.012 away. Black text reads best on it, at 7.04:1.
| Hue family | Greens |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.142) |
| Temperature | in between |
| Nearest name | Fern (#63A950) |
| Black text | 7.04:1 |
| White text | 2.98:1 |
Values
| HEX | #66A548 |
| RGB | rgb(102, 165, 72) |
| HSL | hsl(101, 39%, 46%) |
| OKLCH | oklch(65.8% 0.142 136.7) |
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 #66A548 | 2.98:1 | Fails | Lc -61.6 | Content text, not long reading |
| Black text on #66A548 | 7.04:1 | AAA | Lc 47.8 | Large or bold text, headings |
| #66A548 text on white | 2.98:1 | Fails | Lc 56.3 | Large or bold text, headings |
| #66A548 text on black | 7.04:1 | AAA | Lc -45.5 | 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 500.
-
Step 50
50
#F3F7F1
oklch(97.1% 0.009 134.9)
-
Step 100
100
#E4EDE0
oklch(93.6% 0.02 135.8)
-
Step 200
200
#CEDFC7
oklch(88.4% 0.037 136.5)
-
Step 300
300
#ACCC9F
oklch(81% 0.071 136.7)
-
Step 400
400
#7FB16A
oklch(70.7% 0.112 136.9)
-
Step 500
500 (this color)
#66A548
oklch(65.8% 0.142 136.7)
-
Step 600
600
#438719
oklch(55.7% 0.155 136.6)
-
Step 700
700
#347208
oklch(49.1% 0.144 136.7)
-
Step 800
800
#2C5D0E
oklch(42.8% 0.119 136.7)
-
Step 900
900
#284C15
oklch(37.6% 0.093 136.6)
-
Step 950
950
#182D0E
oklch(27.1% 0.059 136.7)
#66A548 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) | #AA993F | 0.090 |
| Deuteranopia (no green cones) | #A1934F | 0.091 |
| Tritanopia (no blue cones) | #64A090 | 0.099 |
| Achromatopsia (no color) | #959595 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66A548
#66A548
oklch(65.8% 0.142 136.7)
- #B474CB
#B474CB
oklch(65.9% 0.142 316.7)
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 #66A548, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Fern #63A950 ΔE 0.012
- Off Green #6BA353 ΔE 0.016
- Mid Green #50A747 ΔE 0.021
- Muted Green #5FA052 ΔE 0.022
- Flat Green #699D4C ΔE 0.025
- Dark Pastel Green #56AE57 ΔE 0.026
- Leaf #71AA34 ΔE 0.027
- Asparagus #77AB56 ΔE 0.031
Use #66A548 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.