#66B151
Closest named color: Dark Pastel Green (#56AE57). oklch(69% 0.151 139.2), rgb(102, 177, 81).
Aa
Black text reads best on this color (7.97:1).
About this color
#66B151 is a medium-light, vivid green. In OKLCH its lightness is 69%, its chroma 0.151 and its hue 139°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Pastel Green (#56AE57), ΔE 0.019 away. Black text reads best on it, at 7.97:1.
| Hue family | Greens |
| Lightness | medium-light (69%) |
| Chroma | vivid (0.151) |
| Temperature | in between |
| Nearest name | Dark Pastel Green (#56AE57) |
| Black text | 7.97:1 |
| White text | 2.63:1 |
Values
| HEX | #66B151 |
| RGB | rgb(102, 177, 81) |
| HSL | hsl(107, 38%, 51%) |
| OKLCH | oklch(69% 0.151 139.2) |
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 #66B151 | 2.63:1 | Fails | Lc -56.3 | Large or bold text, headings |
| Black text on #66B151 | 7.97:1 | AAA | Lc 52.9 | Large or bold text, headings |
| #66B151 text on white | 2.63:1 | Fails | Lc 51.1 | Large or bold text, headings |
| #66B151 text on black | 7.97:1 | AAA | Lc -50.8 | 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
#F1F8F0
oklch(97.2% 0.013 141.8)
-
Step 100
100
#E1EFDD
oklch(93.7% 0.028 138.7)
-
Step 200
200
#C8E2C1
oklch(88.5% 0.052 139.1)
-
Step 300
300
#A1D095
oklch(80.9% 0.095 139.3)
-
Step 400
400 (this color)
#66B151
oklch(69% 0.151 139.2)
-
Step 500
500
#3DA312
oklch(63.1% 0.193 139.2)
-
Step 600
600
#2E8A00
oklch(55.7% 0.176 139.3)
-
Step 700
700
#267400
oklch(49.1% 0.155 139.2)
-
Step 800
800
#1D5F00
oklch(42.7% 0.135 139.3)
-
Step 900
900
#174F00
oklch(37.6% 0.119 139.2)
-
Step 950
950
#0D2F03
oklch(27% 0.08 139.3)
#66B151 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) | #B6A448 | 0.102 |
| Deuteranopia (no green cones) | #AB9D58 | 0.102 |
| Tritanopia (no blue cones) | #61AC9B | 0.102 |
| Achromatopsia (no color) | #9F9F9F | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66B151
#66B151
oklch(69% 0.151 139.2)
- #C37AD6
#C37AD6
oklch(69% 0.151 319.1)
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 #66B151, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Pastel Green #56AE57 ΔE 0.019
- Boring Green #63B365 ΔE 0.021
- Fern #63A950 ΔE 0.024
- Asparagus #77AB56 ΔE 0.026
- Leaf #71AA34 ΔE 0.026
- Turtle Green #75B84F ΔE 0.027
- Grass #5CAC2D ΔE 0.035
- Algae #54AC68 ΔE 0.036
Use #66B151 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.