#66DAAF
Closest named color: Seafoam Blue (#78D1B6). oklch(80.9% 0.123 166.4), rgb(102, 218, 175).
Aa
Black text reads best on this color (12.21:1).
About this color
#66DAAF is a light, moderately saturated green. In OKLCH its lightness is 81%, its chroma 0.123 and its hue 166°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Seafoam Blue (#78D1B6), ΔE 0.033 away. Black text reads best on it, at 12.21:1.
| Hue family | Greens |
| Lightness | light (81%) |
| Chroma | moderately saturated (0.123) |
| Temperature | in between |
| Nearest name | Seafoam Blue (#78D1B6) |
| Black text | 12.21:1 |
| White text | 1.71:1 |
Values
| HEX | #66DAAF |
| RGB | rgb(102, 218, 175) |
| HSL | hsl(158, 61%, 63%) |
| OKLCH | oklch(80.9% 0.123 166.4) |
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 #66DAAF | 1.71:1 | Fails | Lc -34.6 | Non-text elements, placeholder text |
| Black text on #66DAAF | 12.21:1 | AAA | Lc 73.1 | Content text, not long reading |
| #66DAAF text on white | 1.71:1 | Fails | Lc 30.7 | Non-text elements, placeholder text |
| #66DAAF text on black | 12.21:1 | AAA | Lc -72.0 | 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
#ECF9F3
oklch(97.1% 0.016 166.7)
-
Step 100
100
#D5F2E5
oklch(93.7% 0.035 166.8)
-
Step 200
200
#AEE8CF
oklch(88.4% 0.068 166.5)
-
Step 300
300 (this color)
#66DAAF
oklch(80.9% 0.123 166.4)
-
Step 400
400
#00BD8C
oklch(70.8% 0.147 166.2)
-
Step 500
500
#00A278
oklch(63.2% 0.13 166.5)
-
Step 600
600
#008864
oklch(55.6% 0.115 166.4)
-
Step 700
700
#007254
oklch(49% 0.101 166.9)
-
Step 800
800
#005E44
oklch(42.7% 0.088 166.3)
-
Step 900
900
#004E38
oklch(37.6% 0.078 166.4)
-
Step 950
950
#002F20
oklch(27.1% 0.056 165.8)
#66DAAF 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) | #D6CDAD | 0.124 |
| Deuteranopia (no green cones) | #C4C0B2 | 0.119 |
| Tritanopia (no blue cones) | #36DBCE | 0.046 |
| Achromatopsia (no color) | #C5C5C5 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66DAAF
#66DAAF
oklch(80.9% 0.123 166.4)
- #FA9FD1
#FA9FD1
oklch(80.8% 0.124 346.1)
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 #66DAAF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Seafoam Blue #78D1B6 ΔE 0.033
- Medium Aquamarine #66CDAA ΔE 0.036
- Aqua Marine #2EE8BB ΔE 0.041
- Turquoise #40E0D0 ΔE 0.044
- Pale Teal #82CBB2 ΔE 0.048
- Emerald #06D6A0 ΔE 0.048
- Light Teal #90E4C1 ΔE 0.054
- Tiffany Blue #94D2BD ΔE 0.054
Use #66DAAF 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.