#66A423
Closest named color: Grass (#5CAC2D). oklch(65.2% 0.168 132.5), rgb(102, 164, 35).
Aa
Black text reads best on this color (6.89:1).
About this color
#66A423 is a medium-light, vivid green. In OKLCH its lightness is 65%, its chroma 0.168 and its hue 133°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Grass (#5CAC2D), ΔE 0.022 away. Black text reads best on it, at 6.89:1.
| Hue family | Greens |
| Lightness | medium-light (65%) |
| Chroma | vivid (0.168) |
| Temperature | in between |
| Nearest name | Grass (#5CAC2D) |
| Black text | 6.89:1 |
| White text | 3.04:1 |
Values
| HEX | #66A423 |
| RGB | rgb(102, 164, 35) |
| HSL | hsl(89, 65%, 39%) |
| OKLCH | oklch(65.2% 0.168 132.5) |
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 #66A423 | 3.04:1 | AA large text | Lc -62.4 | Content text, not long reading |
| Black text on #66A423 | 6.89:1 | AA | Lc 47.0 | Large or bold text, headings |
| #66A423 text on white | 3.04:1 | AA large text | Lc 57.0 | Large or bold text, headings |
| #66A423 text on black | 6.89:1 | AA | Lc -44.8 | Non-text elements, placeholder text |
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
#F3F7F0
oklch(97.1% 0.01 131.4)
-
Step 100
100
#E4EEDD
oklch(93.7% 0.025 132.1)
-
Step 200
200
#CEE0C1
oklch(88.5% 0.046 132.1)
-
Step 300
300
#ADCC96
oklch(80.9% 0.081 132.3)
-
Step 400
400
#80B258
oklch(70.8% 0.132 132.8)
-
Step 500
500 (this color)
#66A423
oklch(65.2% 0.168 132.5)
-
Step 600
600
#4D8500
oklch(55.6% 0.156 132.7)
-
Step 700
700
#407000
oklch(49.1% 0.138 132.7)
-
Step 800
800
#345C00
oklch(42.8% 0.12 132.5)
-
Step 900
900
#2A4C00
oklch(37.6% 0.105 132.5)
-
Step 950
950
#192D04
oklch(27% 0.069 132.1)
#66A423 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) | #AB9700 | 0.093 |
| Deuteranopia (no green cones) | #A39231 | 0.095 |
| Tritanopia (no blue cones) | #679D8C | 0.126 |
| Achromatopsia (no color) | #949494 | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66A423
#66A423
oklch(65.2% 0.168 132.5)
- #B26DD8
#B26DD8
oklch(65.2% 0.167 312.4)
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 #66A423, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grass #5CAC2D ΔE 0.022
- Leaf Green #5CA904 ΔE 0.023
- Leaf #71AA34 ΔE 0.024
- Mid Green #50A747 ΔE 0.028
- Fern #63A950 ΔE 0.035
- Medium Green #39AD48 ΔE 0.040
- Dark Pastel Green #56AE57 ΔE 0.043
- Avocado Green #87A922 ΔE 0.043
Use #66A423 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.