#66DDAA
Closest named color: Aqua Marine (#2EE8BB). oklch(81.5% 0.131 163), rgb(102, 221, 170).
Aa
Black text reads best on this color (12.48:1).
About this color
#66DDAA is a light, moderately saturated green. In OKLCH its lightness is 82%, its chroma 0.131 and its hue 163°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Aqua Marine (#2EE8BB), ΔE 0.036 away. Black text reads best on it, at 12.48:1.
| Hue family | Greens |
| Lightness | light (82%) |
| Chroma | moderately saturated (0.131) |
| Temperature | in between |
| Nearest name | Aqua Marine (#2EE8BB) |
| Black text | 12.48:1 |
| White text | 1.68:1 |
Values
| HEX | #66DDAA |
| RGB | rgb(102, 221, 170) |
| HSL | hsl(154, 64%, 63%) |
| OKLCH | oklch(81.5% 0.131 163) |
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 #66DDAA | 1.68:1 | Fails | Lc -33.3 | Non-text elements, placeholder text |
| Black text on #66DDAA | 12.48:1 | AAA | Lc 74.3 | Content text, not long reading |
| #66DDAA text on white | 1.68:1 | Fails | Lc 29.5 | Dividers and decoration only |
| #66DDAA text on black | 12.48:1 | AAA | Lc -73.3 | 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
#D4F2E3
oklch(93.5% 0.037 164.1)
-
Step 200
200
#ADE9CB
oklch(88.5% 0.074 162.7)
-
Step 300
300 (this color)
#66DDAA
oklch(81.5% 0.131 163)
-
Step 400
400
#00BD85
oklch(70.6% 0.152 163.2)
-
Step 500
500
#00A271
oklch(63% 0.136 163)
-
Step 600
600
#00895E
oklch(55.7% 0.121 162.5)
-
Step 700
700
#00734F
oklch(49.1% 0.106 163)
-
Step 800
800
#005E40
oklch(42.6% 0.092 163.1)
-
Step 900
900
#004F35
oklch(37.8% 0.082 162.9)
-
Step 950
950
#002F1E
oklch(27% 0.058 163)
#66DDAA 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) | #DACFA7 | 0.128 |
| Deuteranopia (no green cones) | #C8C2AD | 0.124 |
| Tritanopia (no blue cones) | #38DDCF | 0.053 |
| Achromatopsia (no color) | #C8C8C8 | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66DDAA
#66DDAA
oklch(81.5% 0.131 163)
- #FD9FD9
#FD9FD9
oklch(81.4% 0.132 342.8)
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 #66DDAA, closest first.
No curated palette has a color within ΔE 0.04 of #66DDAA.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Marine #2EE8BB ΔE 0.036
- Seafoam Blue #78D1B6 ΔE 0.044
- Medium Aquamarine #66CDAA ΔE 0.046
- Emerald #06D6A0 ΔE 0.048
- Turquoise #40E0D0 ΔE 0.051
- Aqua Green #12E193 ΔE 0.053
- Light Teal #90E4C1 ΔE 0.054
- Hospital Green #9BE5AA ΔE 0.055
Use #66DDAA 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.