#66B433
Closest named color: Leafy Green (#51B73B). oklch(69.4% 0.179 135.7), rgb(102, 180, 51).
Aa
Black text reads best on this color (8.14:1).
About this color
#66B433 is a medium-light, vivid green. In OKLCH its lightness is 69%, its chroma 0.179 and its hue 136°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Leafy Green (#51B73B), ΔE 0.017 away. Black text reads best on it, at 8.14:1.
| Hue family | Greens |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.179) |
| Temperature | in between |
| Nearest name | Leafy Green (#51B73B) |
| Black text | 8.14:1 |
| White text | 2.57:1 |
Values
| HEX | #66B433 |
| RGB | rgb(102, 180, 51) |
| HSL | hsl(96, 56%, 45%) |
| OKLCH | oklch(69.4% 0.179 135.7) |
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 #66B433 | 2.57:1 | Fails | Lc -55.3 | Large or bold text, headings |
| Black text on #66B433 | 8.14:1 | AAA | Lc 53.8 | Large or bold text, headings |
| #66B433 text on white | 2.57:1 | Fails | Lc 50.2 | Large or bold text, headings |
| #66B433 text on black | 8.14:1 | AAA | Lc -51.8 | 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 400.
-
Step 50
50
#F1F8EE
oklch(97.1% 0.015 136.1)
-
Step 100
100
#E1EFDA
oklch(93.6% 0.032 135)
-
Step 200
200
#C7E3BA
oklch(88.5% 0.063 135.7)
-
Step 300
300
#A0D188
oklch(80.8% 0.111 135.8)
-
Step 400
400 (this color)
#66B433
oklch(69.4% 0.179 135.7)
-
Step 500
500
#4FA100
oklch(63.2% 0.187 135.8)
-
Step 600
600
#428700
oklch(55.6% 0.164 135.6)
-
Step 700
700
#367200
oklch(49.2% 0.146 135.8)
-
Step 800
800
#2B5D00
oklch(42.6% 0.126 135.7)
-
Step 900
900
#234E00
oklch(37.8% 0.112 135.7)
-
Step 950
950
#122E00
oklch(26.8% 0.079 135.7)
#66B433 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) | #BAA51D | 0.108 |
| Deuteranopia (no green cones) | #B09F3F | 0.109 |
| Tritanopia (no blue cones) | #63AD9B | 0.129 |
| Achromatopsia (no color) | #A1A1A1 | 0.179 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66B433
#66B433
oklch(69.4% 0.179 135.7)
- #C675E7
#C675E7
oklch(69.4% 0.179 315.4)
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 #66B433, closest first.
No curated palette has a color within ΔE 0.04 of #66B433.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Leafy Green #51B73B ΔE 0.017
- Grass #5CAC2D ΔE 0.026
- Leaf #71AA34 ΔE 0.029
- Turtle Green #75B84F ΔE 0.032
- Frog Green #58BC08 ΔE 0.035
- Dark Lime #84B701 ΔE 0.036
- Leaf Green #5CA904 ΔE 0.037
- Dark Pastel Green #56AE57 ΔE 0.042
Use #66B433 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.