#66BC4E
Closest named color: Turtle Green (#75B84F). oklch(71.7% 0.169 139.3), rgb(102, 188, 78).
Aa
Black text reads best on this color (8.86:1).
About this color
#66BC4E is a medium-light, vivid green. In OKLCH its lightness is 72%, its chroma 0.169 and its hue 139°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Turtle Green (#75B84F), ΔE 0.018 away. Black text reads best on it, at 8.86:1.
| Hue family | Greens |
| Lightness | medium-light (72%) |
| Chroma | vivid (0.169) |
| Temperature | in between |
| Nearest name | Turtle Green (#75B84F) |
| Black text | 8.86:1 |
| White text | 2.36:1 |
Values
| HEX | #66BC4E |
| RGB | rgb(102, 188, 78) |
| HSL | hsl(107, 45%, 52%) |
| OKLCH | oklch(71.7% 0.169 139.3) |
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 #66BC4E | 2.36:1 | Fails | Lc -51.4 | Large or bold text, headings |
| Black text on #66BC4E | 8.86:1 | AAA | Lc 57.6 | Large or bold text, headings |
| #66BC4E text on white | 2.36:1 | Fails | Lc 46.4 | Large or bold text, headings |
| #66BC4E text on black | 8.86:1 | AAA | Lc -55.6 | 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
#E0EFDC
oklch(93.6% 0.03 139.1)
-
Step 200
200
#C6E3BE
oklch(88.5% 0.059 138.9)
-
Step 300
300
#9DD18F
oklch(80.8% 0.105 139.1)
-
Step 400
400 (this color)
#66BC4E
oklch(71.7% 0.169 139.3)
-
Step 500
500
#38A400
oklch(63.1% 0.2 139.3)
-
Step 600
600
#2D8A00
oklch(55.6% 0.177 139.4)
-
Step 700
700
#257400
oklch(49.1% 0.156 139.3)
-
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
#0A3000
oklch(27.2% 0.086 139.4)
#66BC4E 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) | #C1AD43 | 0.114 |
| Deuteranopia (no green cones) | #B5A656 | 0.113 |
| Tritanopia (no blue cones) | #5FB6A4 | 0.115 |
| Achromatopsia (no color) | #A8A8A8 | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66BC4E
#66BC4E
oklch(71.7% 0.169 139.3)
- #D07DE5
#D07DE5
oklch(71.6% 0.169 319.3)
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 #66BC4E, closest first.
No curated palette has a color within ΔE 0.04 of #66BC4E.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turtle Green #75B84F ΔE 0.018
- Leafy Green #51B73B ΔE 0.030
- Dark Mint #48C072 ΔE 0.038
- Boring Green #63B365 ΔE 0.041
- Dark Lime #84B701 ΔE 0.041
- Dark Lime Green #7EBD01 ΔE 0.041
- Cool Green #33B864 ΔE 0.042
- Algae Green #21C36F ΔE 0.044
Use #66BC4E 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.