#66BE40
Closest named color: Leafy Green (#51B73B). oklch(72.1% 0.183 137.7), rgb(102, 190, 64).
Aa
Black text reads best on this color (9.00:1).
About this color
#66BE40 is a medium-light, vivid green. In OKLCH its lightness is 72%, its chroma 0.183 and its hue 138°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Leafy Green (#51B73B), ΔE 0.029 away. Black text reads best on it, at 9.00:1.
| Hue family | Greens |
| Lightness | medium-light (72%) |
| Chroma | vivid (0.183) |
| Temperature | in between |
| Nearest name | Leafy Green (#51B73B) |
| Black text | 9.00:1 |
| White text | 2.33:1 |
Values
| HEX | #66BE40 |
| RGB | rgb(102, 190, 64) |
| HSL | hsl(102, 50%, 50%) |
| OKLCH | oklch(72.1% 0.183 137.7) |
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 #66BE40 | 2.33:1 | Fails | Lc -50.6 | Large or bold text, headings |
| Black text on #66BE40 | 9.00:1 | AAA | Lc 58.3 | Large or bold text, headings |
| #66BE40 text on white | 2.33:1 | Fails | Lc 45.7 | Large or bold text, headings |
| #66BE40 text on black | 9.00:1 | AAA | Lc -56.4 | 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
#F1F8EE
oklch(97.1% 0.015 136.1)
-
Step 100
100
#E0EFDA
oklch(93.5% 0.032 136.6)
-
Step 200
200
#C5E4BB
oklch(88.6% 0.064 138.1)
-
Step 300
300
#9CD289
oklch(80.8% 0.114 137.8)
-
Step 400
400 (this color)
#66BE40
oklch(72.1% 0.183 137.7)
-
Step 500
500
#44A200
oklch(63% 0.193 137.6)
-
Step 600
600
#388900
oklch(55.7% 0.171 137.7)
-
Step 700
700
#2E7300
oklch(49.1% 0.151 137.7)
-
Step 800
800
#245E00
oklch(42.6% 0.131 137.7)
-
Step 900
900
#1D4F00
oklch(37.8% 0.116 137.7)
-
Step 950
950
#0E2F00
oklch(27% 0.083 137.8)
#66BE40 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) | #C4AE2F | 0.118 |
| Deuteranopia (no green cones) | #B8A74B | 0.118 |
| Tritanopia (no blue cones) | #60B8A4 | 0.126 |
| Achromatopsia (no color) | #AAAAAA | 0.183 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66BE40
#66BE40
oklch(72.1% 0.183 137.7)
- #D37BEE
#D37BEE
oklch(72.1% 0.183 317.8)
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 #66BE40, closest first.
No curated palette has a color within ΔE 0.04 of #66BE40.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Leafy Green #51B73B ΔE 0.029
- Turtle Green #75B84F ΔE 0.029
- Dark Lime Green #7EBD01 ΔE 0.030
- Frog Green #58BC08 ΔE 0.032
- Dark Lime #84B701 ΔE 0.034
- Apple #6ECB3C ΔE 0.039
- Shamrock Green #02C14D ΔE 0.043
- Dark Mint #48C072 ΔE 0.049
Use #66BE40 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.