#66AA40
Closest named color: Leaf (#71AA34). oklch(67% 0.156 136), rgb(102, 170, 64).
Aa
Black text reads best on this color (7.38:1).
About this color
#66AA40 is a medium-light, vivid green. In OKLCH its lightness is 67%, its chroma 0.156 and its hue 136°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Leaf (#71AA34), ΔE 0.013 away. Black text reads best on it, at 7.38:1.
| Hue family | Greens |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.156) |
| Temperature | in between |
| Nearest name | Leaf (#71AA34) |
| Black text | 7.38:1 |
| White text | 2.84:1 |
Values
| HEX | #66AA40 |
| RGB | rgb(102, 170, 64) |
| HSL | hsl(98, 45%, 46%) |
| OKLCH | oklch(67% 0.156 136) |
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 #66AA40 | 2.84:1 | Fails | Lc -59.6 | Large or bold text, headings |
| Black text on #66AA40 | 7.38:1 | AAA | Lc 49.7 | Large or bold text, headings |
| #66AA40 text on white | 2.84:1 | Fails | Lc 54.3 | Large or bold text, headings |
| #66AA40 text on black | 7.38:1 | AAA | Lc -47.5 | 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 400.
-
Step 50
50
#F2F8EF
oklch(97.2% 0.013 134.9)
-
Step 100
100
#E2EFDC
oklch(93.7% 0.029 135.6)
-
Step 200
200
#C9E2BF
oklch(88.5% 0.054 136.7)
-
Step 300
300
#A4CF90
oklch(80.8% 0.097 136)
-
Step 400
400 (this color)
#66AA40
oklch(67% 0.156 136)
-
Step 500
500
#4EA100
oklch(63.1% 0.188 136)
-
Step 600
600
#408700
oklch(55.5% 0.165 136)
-
Step 700
700
#357200
oklch(49.1% 0.146 136)
-
Step 800
800
#2A5D00
oklch(42.6% 0.127 136)
-
Step 900
900
#224E00
oklch(37.7% 0.112 136.1)
-
Step 950
950
#122F00
oklch(27.2% 0.081 136)
#66AA40 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) | #B09D34 | 0.097 |
| Deuteranopia (no green cones) | #A69748 | 0.097 |
| Tritanopia (no blue cones) | #64A494 | 0.112 |
| Achromatopsia (no color) | #999999 | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66AA40
#66AA40
oklch(67% 0.156 136)
- #BA74D5
#BA74D5
oklch(67% 0.156 316)
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 #66AA40, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Leaf #71AA34 ΔE 0.013
- Fern #63A950 ΔE 0.016
- Grass #5CAC2D ΔE 0.021
- Dark Pastel Green #56AE57 ΔE 0.023
- Mid Green #50A747 ΔE 0.024
- Asparagus #77AB56 ΔE 0.032
- Off Green #6BA353 ΔE 0.033
- Medium Green #39AD48 ΔE 0.034
Use #66AA40 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.