#66C04E
Closest named color: Turtle Green (#75B84F). oklch(72.7% 0.174 139.5), rgb(102, 192, 78).
Aa
Black text reads best on this color (9.21:1).
About this color
#66C04E is a medium-light, vivid green. In OKLCH its lightness is 73%, its chroma 0.174 and its hue 140°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Turtle Green (#75B84F), ΔE 0.026 away. Black text reads best on it, at 9.21:1.
| Hue family | Greens |
| Lightness | medium-light (73%) |
| Chroma | vivid (0.174) |
| Temperature | in between |
| Nearest name | Turtle Green (#75B84F) |
| Black text | 9.21:1 |
| White text | 2.27:1 |
Values
| HEX | #66C04E |
| RGB | rgb(102, 192, 78) |
| HSL | hsl(107, 48%, 53%) |
| OKLCH | oklch(72.7% 0.174 139.5) |
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 #66C04E | 2.27:1 | Fails | Lc -49.5 | Large or bold text, headings |
| Black text on #66C04E | 9.21:1 | AAA | Lc 59.3 | Large or bold text, headings |
| #66C04E text on white | 2.27:1 | Fails | Lc 44.7 | Non-text elements, placeholder text |
| #66C04E text on black | 9.21:1 | AAA | Lc -57.4 | 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
#F1F8EF
oklch(97.1% 0.014 138.7)
-
Step 100
100
#DFEFDB
oklch(93.5% 0.032 139.4)
-
Step 200
200
#C5E3BE
oklch(88.4% 0.059 139.8)
-
Step 300
300
#9BD28E
oklch(80.9% 0.109 139.7)
-
Step 400
400 (this color)
#66C04E
oklch(72.7% 0.174 139.5)
-
Step 500
500
#36A400
oklch(63.1% 0.201 139.5)
-
Step 600
600
#2C8A00
oklch(55.6% 0.177 139.5)
-
Step 700
700
#247400
oklch(49.1% 0.156 139.5)
-
Step 800
800
#1C5F00
oklch(42.6% 0.136 139.5)
-
Step 900
900
#165000
oklch(37.9% 0.121 139.5)
-
Step 950
950
#0A3000
oklch(27.2% 0.086 139.4)
#66C04E 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) | #C5B142 | 0.117 |
| Deuteranopia (no green cones) | #B9A957 | 0.118 |
| Tritanopia (no blue cones) | #5EBAA7 | 0.117 |
| Achromatopsia (no color) | #ACACAC | 0.175 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66C04E
#66C04E
oklch(72.7% 0.174 139.5)
- #D57FEA
#D57FEA
oklch(72.7% 0.173 319.5)
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 #66C04E, closest first.
No curated palette has a color within ΔE 0.04 of #66C04E.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turtle Green #75B84F ΔE 0.026
- Leafy Green #51B73B ΔE 0.036
- Dark Lime Green #7EBD01 ΔE 0.038
- Apple #6ECB3C ΔE 0.039
- Dark Mint #48C072 ΔE 0.040
- Dark Lime #84B701 ΔE 0.042
- Frog Green #58BC08 ΔE 0.043
- Algae Green #21C36F ΔE 0.044
Use #66C04E 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.