#66D587
Closest named color: Aqua Green (#12E193). oklch(78.8% 0.151 151.2), rgb(102, 213, 135).
Aa
Black text reads best on this color (11.43:1).
About this color
#66D587 is a light, vivid green. In OKLCH its lightness is 79%, its chroma 0.151 and its hue 151°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Aqua Green (#12E193), ΔE 0.041 away. Black text reads best on it, at 11.43:1.
| Hue family | Greens |
| Lightness | light (79%) |
| Chroma | vivid (0.151) |
| Temperature | in between |
| Nearest name | Aqua Green (#12E193) |
| Black text | 11.43:1 |
| White text | 1.83:1 |
Values
| HEX | #66D587 |
| RGB | rgb(102, 213, 135) |
| HSL | hsl(138, 57%, 62%) |
| OKLCH | oklch(78.8% 0.151 151.2) |
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 #66D587 | 1.83:1 | Fails | Lc -38.3 | Non-text elements, placeholder text |
| Black text on #66D587 | 11.43:1 | AAA | Lc 69.7 | Content text, not long reading |
| #66D587 text on white | 1.83:1 | Fails | Lc 34.2 | Non-text elements, placeholder text |
| #66D587 text on black | 11.43:1 | AAA | Lc -68.4 | Content text, not long reading |
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 300.
-
Step 50
50
#ECFAEF
oklch(97.2% 0.021 152.2)
-
Step 100
100
#D6F3DB
oklch(93.7% 0.044 150.3)
-
Step 200
200
#B1EABD
oklch(88.6% 0.085 150.8)
-
Step 300
300 (this color)
#66D587
oklch(78.8% 0.151 151.2)
-
Step 400
400
#00C05F
oklch(70.7% 0.189 151.2)
-
Step 500
500
#00A550
oklch(63.2% 0.17 151.1)
-
Step 600
600
#008B43
oklch(55.7% 0.149 151.3)
-
Step 700
700
#007537
oklch(49.2% 0.132 151.1)
-
Step 800
800
#00602C
oklch(42.8% 0.115 151.2)
-
Step 900
900
#005024
oklch(37.7% 0.101 151.4)
-
Step 950
950
#003013
oklch(27.1% 0.072 151.4)
#66D587 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) | #D6C682 | 0.129 |
| Deuteranopia (no green cones) | #C6BB8C | 0.126 |
| Tritanopia (no blue cones) | #4CD2C1 | 0.081 |
| Achromatopsia (no color) | #BFBFBF | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66D587
#66D587
oklch(78.8% 0.151 151.2)
- #F194E6
#F194E6
oklch(78.8% 0.151 331.3)
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 #66D587, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Green #12E193 ΔE 0.041
- Emerald #06D6A0 ΔE 0.044
- Seaweed #18D17B ΔE 0.045
- Soft Green #6FC276 ΔE 0.050
- Weird Green #3AE57F ΔE 0.053
- Medium Aquamarine #66CDAA ΔE 0.058
- Fresh Green #69D84F ΔE 0.062
- Light Moss Green #A6C875 ΔE 0.066
Use #66D587 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.