#66B423
Closest named color: Leafy Green (#51B73B). oklch(69.3% 0.187 134.6), rgb(102, 180, 35).
Aa
Black text reads best on this color (8.11:1).
About this color
#66B423 is a medium-light, vivid green. In OKLCH its lightness is 69%, its chroma 0.187 and its hue 135°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Leafy Green (#51B73B), ΔE 0.019 away. Black text reads best on it, at 8.11:1.
| Hue family | Greens |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.187) |
| Temperature | in between |
| Nearest name | Leafy Green (#51B73B) |
| Black text | 8.11:1 |
| White text | 2.58:1 |
Values
| HEX | #66B423 |
| RGB | rgb(102, 180, 35) |
| HSL | hsl(92, 67%, 42%) |
| OKLCH | oklch(69.3% 0.187 134.6) |
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 #66B423 | 2.58:1 | Fails | Lc -55.4 | Large or bold text, headings |
| Black text on #66B423 | 8.11:1 | AAA | Lc 53.7 | Large or bold text, headings |
| #66B423 text on white | 2.58:1 | Fails | Lc 50.3 | Large or bold text, headings |
| #66B423 text on black | 8.11:1 | AAA | Lc -51.7 | 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
#F1F8ED
oklch(97.1% 0.016 133.8)
-
Step 100
100
#E1EFD9
oklch(93.6% 0.033 133.9)
-
Step 200
200
#C7E3B8
oklch(88.4% 0.065 134.7)
-
Step 300
300
#A0D283
oklch(81% 0.118 134.7)
-
Step 400
400 (this color)
#66B423
oklch(69.3% 0.187 134.6)
-
Step 500
500
#55A000
oklch(63.2% 0.183 134.5)
-
Step 600
600
#468600
oklch(55.5% 0.161 134.6)
-
Step 700
700
#3A7100
oklch(49.1% 0.142 134.6)
-
Step 800
800
#2F5D00
oklch(42.8% 0.124 134.5)
-
Step 900
900
#264D00
oklch(37.6% 0.109 134.4)
-
Step 950
950
#142E00
oklch(27% 0.078 134.6)
#66B423 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) | #BBA500 | 0.110 |
| Deuteranopia (no green cones) | #B19F34 | 0.111 |
| Tritanopia (no blue cones) | #65AD9A | 0.138 |
| Achromatopsia (no color) | #A1A1A1 | 0.188 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66B423
#66B423
oklch(69.3% 0.187 134.6)
- #C673EB
#C673EB
oklch(69.3% 0.186 314.5)
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 #66B423, closest first.
No curated palette has a color within ΔE 0.04 of #66B423.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Leafy Green #51B73B ΔE 0.019
- Grass #5CAC2D ΔE 0.027
- Frog Green #58BC08 ΔE 0.028
- Dark Lime #84B701 ΔE 0.034
- Leaf Green #5CA904 ΔE 0.034
- Leaf #71AA34 ΔE 0.034
- Dark Lime Green #7EBD01 ΔE 0.039
- Turtle Green #75B84F ΔE 0.039
Use #66B423 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.