#66A91C
Closest named color: Grass (#5CAC2D). oklch(66.5% 0.177 132.9), rgb(102, 169, 28).
Aa
Black text reads best on this color (7.25:1).
About this color
#66A91C is a medium-light, vivid green. In OKLCH its lightness is 66%, its chroma 0.177 and its hue 133°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Grass (#5CAC2D), ΔE 0.012 away. Black text reads best on it, at 7.25:1.
| Hue family | Greens |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.177) |
| Temperature | in between |
| Nearest name | Grass (#5CAC2D) |
| Black text | 7.25:1 |
| White text | 2.89:1 |
Values
| HEX | #66A91C |
| RGB | rgb(102, 169, 28) |
| HSL | hsl(89, 72%, 39%) |
| OKLCH | oklch(66.5% 0.177 132.9) |
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 #66A91C | 2.89:1 | Fails | Lc -60.3 | Content text, not long reading |
| Black text on #66A91C | 7.25:1 | AAA | Lc 49.1 | Large or bold text, headings |
| #66A91C text on white | 2.89:1 | Fails | Lc 55.0 | Large or bold text, headings |
| #66A91C text on black | 7.25:1 | AAA | Lc -46.8 | 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 500.
-
Step 50
50
#F2F7EF
oklch(97% 0.012 133.4)
-
Step 100
100
#E3EEDD
oklch(93.6% 0.025 134.3)
-
Step 200
200
#CDE0C0
oklch(88.4% 0.048 132.6)
-
Step 300
300
#ABCD93
oklch(80.9% 0.087 132.8)
-
Step 400
400
#7EB353
oklch(70.8% 0.139 132.9)
-
Step 500
500 (this color)
#66A91C
oklch(66.5% 0.177 132.9)
-
Step 600
600
#4C8500
oklch(55.5% 0.157 132.9)
-
Step 700
700
#3F7000
oklch(49.1% 0.138 133)
-
Step 800
800
#335C00
oklch(42.8% 0.12 132.9)
-
Step 900
900
#2A4D00
oklch(37.9% 0.107 132.8)
-
Step 950
950
#172D02
oklch(26.8% 0.073 133)
#66A91C 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) | #B09B00 | 0.100 |
| Deuteranopia (no green cones) | #A7962D | 0.100 |
| Tritanopia (no blue cones) | #67A290 | 0.133 |
| Achromatopsia (no color) | #989898 | 0.178 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66A91C
#66A91C
oklch(66.5% 0.177 132.9)
- #B96EE0
#B96EE0
oklch(66.6% 0.177 312.9)
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 #66A91C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Grass #5CAC2D ΔE 0.012
- Leaf Green #5CA904 ΔE 0.014
- Leaf #71AA34 ΔE 0.021
- Mid Green #50A747 ΔE 0.035
- Medium Green #39AD48 ΔE 0.039
- Leafy Green #51B73B ΔE 0.039
- Fern #63A950 ΔE 0.039
- Avocado Green #87A922 ΔE 0.039
Use #66A91C 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.