#66A554
Closest named color: Off Green (#6BA353). oklch(66% 0.131 139), rgb(102, 165, 84).
Aa
Black text reads best on this color (7.07:1).
About this color
#66A554 is a medium-light, moderately saturated green. In OKLCH its lightness is 66%, its chroma 0.131 and its hue 139°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Off Green (#6BA353), ΔE 0.007 away. Black text reads best on it, at 7.07:1.
| Hue family | Greens |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.131) |
| Temperature | in between |
| Nearest name | Off Green (#6BA353) |
| Black text | 7.07:1 |
| White text | 2.96:1 |
Values
| HEX | #66A554 |
| RGB | rgb(102, 165, 84) |
| HSL | hsl(107, 33%, 49%) |
| OKLCH | oklch(66% 0.131 139) |
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 #66A554 | 2.96:1 | Fails | Lc -61.4 | Content text, not long reading |
| Black text on #66A554 | 7.07:1 | AAA | Lc 47.9 | Large or bold text, headings |
| #66A554 text on white | 2.96:1 | Fails | Lc 56.1 | Large or bold text, headings |
| #66A554 text on black | 7.07:1 | AAA | Lc -45.7 | 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 500.
-
Step 50
50
#F3F7F1
oklch(97.1% 0.009 134.9)
-
Step 100
100
#E4EDE1
oklch(93.6% 0.019 137.8)
-
Step 200
200
#CEDFC9
oklch(88.5% 0.035 138.6)
-
Step 300
300
#ACCBA4
oklch(80.9% 0.063 139.3)
-
Step 400
400
#7FB072
oklch(70.7% 0.102 139.2)
-
Step 500
500 (this color)
#66A554
oklch(66% 0.131 139)
-
Step 600
600
#42862C
oklch(55.6% 0.142 139)
-
Step 700
700
#33721F
oklch(49.2% 0.133 139.2)
-
Step 800
800
#2B5D1C
oklch(42.8% 0.11 139.2)
-
Step 900
900
#284C1D
oklch(37.7% 0.085 138.9)
-
Step 950
950
#182D12
oklch(27.1% 0.054 139)
#66A554 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) | #A9994D | 0.089 |
| Deuteranopia (no green cones) | #A09459 | 0.088 |
| Tritanopia (no blue cones) | #62A092 | 0.089 |
| Achromatopsia (no color) | #969696 | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66A554
#66A554
oklch(66% 0.131 139)
- #B476C5
#B476C5
oklch(65.9% 0.132 318.8)
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 #66A554, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Off Green #6BA353 ΔE 0.007
- Fern #63A950 ΔE 0.014
- Muted Green #5FA052 ΔE 0.017
- Flat Green #699D4C ΔE 0.022
- Dull Green #74A662 ΔE 0.025
- Algae #54AC68 ΔE 0.026
- Asparagus #77AB56 ΔE 0.027
- Dark Pastel Green #56AE57 ΔE 0.027
Use #66A554 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.