#66A641
Closest named color: Fern (#63A950). oklch(66% 0.15 135.7), rgb(102, 166, 65).
Aa
Black text reads best on this color (7.09:1).
About this color
#66A641 is a medium-light, vivid green. In OKLCH its lightness is 66%, its chroma 0.150 and its hue 136°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Fern (#63A950), ΔE 0.014 away. Black text reads best on it, at 7.09:1.
| Hue family | Greens |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.150) |
| Temperature | in between |
| Nearest name | Fern (#63A950) |
| Black text | 7.09:1 |
| White text | 2.95:1 |
Values
| HEX | #66A641 |
| RGB | rgb(102, 166, 65) |
| HSL | hsl(98, 44%, 45%) |
| OKLCH | oklch(66% 0.15 135.7) |
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 #66A641 | 2.95:1 | Fails | Lc -61.3 | Content text, not long reading |
| Black text on #66A641 | 7.09:1 | AAA | Lc 48.1 | Large or bold text, headings |
| #66A641 text on white | 2.95:1 | Fails | Lc 55.9 | Large or bold text, headings |
| #66A641 text on black | 7.09:1 | AAA | Lc -45.8 | 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
#E4EDDF
oklch(93.5% 0.021 134.1)
-
Step 200
200
#CEE0C5
oklch(88.6% 0.041 135.1)
-
Step 300
300
#ACCC9D
oklch(80.9% 0.073 135.8)
-
Step 400
400
#7FB165
oklch(70.7% 0.118 135.6)
-
Step 500
500 (this color)
#66A641
oklch(66% 0.15 135.7)
-
Step 600
600
#428704
oklch(55.6% 0.163 135.8)
-
Step 700
700
#367200
oklch(49.2% 0.146 135.8)
-
Step 800
800
#2C5D01
oklch(42.7% 0.125 135.5)
-
Step 900
900
#284D10
oklch(37.9% 0.098 135.8)
-
Step 950
950
#182D0B
oklch(27% 0.062 135.4)
#66A641 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) | #AC9936 | 0.094 |
| Deuteranopia (no green cones) | #A39449 | 0.094 |
| Tritanopia (no blue cones) | #64A090 | 0.107 |
| Achromatopsia (no color) | #969696 | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66A641
#66A641
oklch(66% 0.15 135.7)
- #B573D0
#B573D0
oklch(66.1% 0.15 315.5)
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 #66A641, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Fern #63A950 ΔE 0.014
- Mid Green #50A747 ΔE 0.020
- Leaf #71AA34 ΔE 0.021
- Off Green #6BA353 ΔE 0.024
- Dark Pastel Green #56AE57 ΔE 0.027
- Muted Green #5FA052 ΔE 0.029
- Grass #5CAC2D ΔE 0.029
- Flat Green #699D4C ΔE 0.032
Use #66A641 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.