#66B519
Closest named color: Leafy Green (#51B73B). oklch(69.5% 0.192 134.2), rgb(102, 181, 25).
Aa
Black text reads best on this color (8.18:1).
About this color
#66B519 is a medium-light, vivid green. In OKLCH its lightness is 70%, its chroma 0.192 and its hue 134°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Leafy Green (#51B73B), ΔE 0.021 away. Black text reads best on it, at 8.18:1.
| Hue family | Greens |
| Lightness | medium-light (70%) |
| Chroma | vivid (0.192) |
| Temperature | in between |
| Nearest name | Leafy Green (#51B73B) |
| Black text | 8.18:1 |
| White text | 2.56:1 |
Values
| HEX | #66B519 |
| RGB | rgb(102, 181, 25) |
| HSL | hsl(90, 76%, 40%) |
| OKLCH | oklch(69.5% 0.192 134.2) |
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 #66B519 | 2.56:1 | Fails | Lc -55.0 | Large or bold text, headings |
| Black text on #66B519 | 8.18:1 | AAA | Lc 54.1 | Large or bold text, headings |
| #66B519 text on white | 2.56:1 | Fails | Lc 49.9 | Large or bold text, headings |
| #66B519 text on black | 8.18:1 | AAA | Lc -52.1 | 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
#E0EFD8
oklch(93.5% 0.034 134.5)
-
Step 200
200
#C7E3B7
oklch(88.4% 0.066 134.2)
-
Step 300
300
#A0D281
oklch(80.9% 0.12 134.2)
-
Step 400
400 (this color)
#66B519
oklch(69.5% 0.192 134.2)
-
Step 500
500
#569F00
oklch(63% 0.181 134.2)
-
Step 600
600
#488600
oklch(55.6% 0.16 134.1)
-
Step 700
700
#3B7100
oklch(49.2% 0.142 134.3)
-
Step 800
800
#305C00
oklch(42.6% 0.122 134)
-
Step 900
900
#274D00
oklch(37.7% 0.108 134.1)
-
Step 950
950
#152E00
oklch(27% 0.078 134)
#66B519 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) | #BCA600 | 0.113 |
| Deuteranopia (no green cones) | #B29F2E | 0.114 |
| Tritanopia (no blue cones) | #65AE9A | 0.141 |
| Achromatopsia (no color) | #A2A2A2 | 0.193 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66B519
#66B519
oklch(69.5% 0.192 134.2)
- #C872EE
#C872EE
oklch(69.6% 0.192 314.5)
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 #66B519, closest first.
No curated palette has a color within ΔE 0.04 of #66B519.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Leafy Green #51B73B ΔE 0.021
- Frog Green #58BC08 ΔE 0.024
- Grass #5CAC2D ΔE 0.032
- Dark Lime #84B701 ΔE 0.033
- Dark Lime Green #7EBD01 ΔE 0.036
- Leaf Green #5CA904 ΔE 0.037
- Leaf #71AA34 ΔE 0.039
- Turtle Green #75B84F ΔE 0.043
Use #66B519 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.