#66BB3F
Closest named color: Leafy Green (#51B73B). oklch(71.3% 0.179 137.4), rgb(102, 187, 63).
Aa
Black text reads best on this color (8.74:1).
About this color
#66BB3F is a medium-light, vivid green. In OKLCH its lightness is 71%, its chroma 0.179 and its hue 137°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Leafy Green (#51B73B), ΔE 0.023 away. Black text reads best on it, at 8.74:1.
| Hue family | Greens |
| Lightness | medium-light (71%) |
| Chroma | vivid (0.179) |
| Temperature | in between |
| Nearest name | Leafy Green (#51B73B) |
| Black text | 8.74:1 |
| White text | 2.40:1 |
Values
| HEX | #66BB3F |
| RGB | rgb(102, 187, 63) |
| HSL | hsl(101, 50%, 49%) |
| OKLCH | oklch(71.3% 0.179 137.4) |
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 #66BB3F | 2.40:1 | Fails | Lc -52.0 | Large or bold text, headings |
| Black text on #66BB3F | 8.74:1 | AAA | Lc 57.0 | Large or bold text, headings |
| #66BB3F text on white | 2.40:1 | Fails | Lc 47.0 | Large or bold text, headings |
| #66BB3F text on black | 8.74:1 | AAA | Lc -55.0 | 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
#C6E3BB
oklch(88.4% 0.062 137.1)
-
Step 300
300
#9DD28A
oklch(80.9% 0.112 137.7)
-
Step 400
400 (this color)
#66BB3F
oklch(71.3% 0.179 137.4)
-
Step 500
500
#46A200
oklch(63.1% 0.192 137.3)
-
Step 600
600
#3A8800
oklch(55.5% 0.169 137.3)
-
Step 700
700
#2F7300
oklch(49.2% 0.15 137.5)
-
Step 800
800
#255E00
oklch(42.7% 0.13 137.5)
-
Step 900
900
#1E4F00
oklch(37.9% 0.116 137.5)
-
Step 950
950
#0F2F00
oklch(27% 0.083 137.4)
#66BB3F 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) | #C1AC2E | 0.114 |
| Deuteranopia (no green cones) | #B6A54A | 0.115 |
| Tritanopia (no blue cones) | #61B5A2 | 0.126 |
| Achromatopsia (no color) | #A7A7A7 | 0.180 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66BB3F
#66BB3F
oklch(71.3% 0.179 137.4)
- #CF7AEB
#CF7AEB
oklch(71.3% 0.179 317.3)
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 #66BB3F, closest first.
No curated palette has a color within ΔE 0.04 of #66BB3F.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Leafy Green #51B73B ΔE 0.023
- Turtle Green #75B84F ΔE 0.025
- Frog Green #58BC08 ΔE 0.032
- Dark Lime Green #7EBD01 ΔE 0.033
- Dark Lime #84B701 ΔE 0.033
- Shamrock Green #02C14D ΔE 0.044
- Grass #5CAC2D ΔE 0.045
- Leaf #71AA34 ΔE 0.046
Use #66BB3F 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.