#66D5A6
Closest named color: Medium Aquamarine (#66CDAA). oklch(79.5% 0.124 163.5), rgb(102, 213, 166).
Aa
Black text reads best on this color (11.63:1).
About this color
#66D5A6 is a light, moderately saturated green. In OKLCH its lightness is 79%, its chroma 0.124 and its hue 164°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Medium Aquamarine (#66CDAA), ΔE 0.025 away. Black text reads best on it, at 11.63:1.
| Hue family | Greens |
| Lightness | light (79%) |
| Chroma | moderately saturated (0.124) |
| Temperature | in between |
| Nearest name | Medium Aquamarine (#66CDAA) |
| Black text | 11.63:1 |
| White text | 1.80:1 |
Values
| HEX | #66D5A6 |
| RGB | rgb(102, 213, 166) |
| HSL | hsl(155, 57%, 62%) |
| OKLCH | oklch(79.5% 0.124 163.5) |
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 #66D5A6 | 1.80:1 | Fails | Lc -37.4 | Non-text elements, placeholder text |
| Black text on #66D5A6 | 11.63:1 | AAA | Lc 70.5 | Content text, not long reading |
| #66D5A6 text on white | 1.80:1 | Fails | Lc 33.3 | Non-text elements, placeholder text |
| #66D5A6 text on black | 11.63:1 | AAA | Lc -69.3 | 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
#ECF9F2
oklch(97.1% 0.017 162.8)
-
Step 100
100
#D5F2E3
oklch(93.6% 0.036 163.2)
-
Step 200
200
#B0E8CD
oklch(88.5% 0.068 163.8)
-
Step 300
300 (this color)
#66D5A6
oklch(79.5% 0.124 163.5)
-
Step 400
400
#00BD86
oklch(70.7% 0.151 163.7)
-
Step 500
500
#00A272
oklch(63% 0.135 163.5)
-
Step 600
600
#00885F
oklch(55.5% 0.119 163.5)
-
Step 700
700
#007350
oklch(49.2% 0.105 163.6)
-
Step 800
800
#005E41
oklch(42.7% 0.091 163.9)
-
Step 900
900
#004F35
oklch(37.8% 0.082 162.9)
-
Step 950
950
#002F1E
oklch(27% 0.058 163)
#66D5A6 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) | #D2C8A3 | 0.121 |
| Deuteranopia (no green cones) | #C1BCA9 | 0.117 |
| Tritanopia (no blue cones) | #3ED5C8 | 0.049 |
| Achromatopsia (no color) | #C1C1C1 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66D5A6
#66D5A6
oklch(79.5% 0.124 163.5)
- #F49BD0
#F49BD0
oklch(79.5% 0.124 343.8)
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 #66D5A6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Aquamarine #66CDAA ΔE 0.025
- Seafoam Blue #78D1B6 ΔE 0.033
- Emerald #06D6A0 ΔE 0.041
- Pale Teal #82CBB2 ΔE 0.044
- Aqua Marine #2EE8BB ΔE 0.052
- Turquoise #40E0D0 ΔE 0.055
- Tiffany Blue #94D2BD ΔE 0.059
- Medium Turquoise #48D1CC ΔE 0.059
Use #66D5A6 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.