#66C166
Closest named color: Soft Green (#6FC276). oklch(73.3% 0.154 143.8), rgb(102, 193, 102).
Aa
Black text reads best on this color (9.38:1).
About this color
#66C166 is a medium-light, vivid green. In OKLCH its lightness is 73%, its chroma 0.154 and its hue 144°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Soft Green (#6FC276), ΔE 0.022 away. Black text reads best on it, at 9.38:1.
| Hue family | Greens |
| Lightness | medium-light (73%) |
| Chroma | vivid (0.154) |
| Temperature | in between |
| Nearest name | Soft Green (#6FC276) |
| Black text | 9.38:1 |
| White text | 2.23:1 |
Values
| HEX | #66C166 |
| RGB | rgb(102, 193, 102) |
| HSL | hsl(120, 42%, 58%) |
| OKLCH | oklch(73.3% 0.154 143.8) |
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 #66C166 | 2.23:1 | Fails | Lc -48.7 | Large or bold text, headings |
| Black text on #66C166 | 9.38:1 | AAA | Lc 60.1 | Content text, not long reading |
| #66C166 text on white | 2.23:1 | Fails | Lc 43.9 | Non-text elements, placeholder text |
| #66C166 text on black | 9.38:1 | AAA | Lc -58.3 | 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
#DFEFDE
oklch(93.6% 0.028 143.7)
-
Step 200
200
#C5E3C3
oklch(88.5% 0.054 143.4)
-
Step 300
300
#9BD199
oklch(80.9% 0.096 143.8)
-
Step 400
400 (this color)
#66C166
oklch(73.3% 0.154 143.8)
-
Step 500
500
#19A628
oklch(63.2% 0.198 143.8)
-
Step 600
600
#008C18
oklch(55.5% 0.181 143.8)
-
Step 700
700
#007613
oklch(49.1% 0.16 143.8)
-
Step 800
800
#00610E
oklch(42.8% 0.139 143.9)
-
Step 900
900
#00510A
oklch(37.7% 0.123 143.9)
-
Step 950
950
#053007
oklch(27.1% 0.082 143.6)
#66C166 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) | #C4B25F | 0.115 |
| Deuteranopia (no green cones) | #B8AA6C | 0.115 |
| Tritanopia (no blue cones) | #5ABCAB | 0.096 |
| Achromatopsia (no color) | #ADADAD | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66C166
#66C166
oklch(73.3% 0.154 143.8)
- #D784DF
#D784DF
oklch(73.2% 0.155 323.8)
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 #66C166, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Soft Green #6FC276 ΔE 0.022
- Dark Mint #48C072 ΔE 0.025
- Turtle Green #75B84F ΔE 0.028
- Algae Green #21C36F ΔE 0.037
- Dark Mint Green #20C073 ΔE 0.040
- Boring Green #63B365 ΔE 0.041
- Cool Green #33B864 ΔE 0.047
- Seaweed #18D17B ΔE 0.050
Use #66C166 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.