#66D8CC
Closest named color: Turquoise (#40E0D0). oklch(81.3% 0.106 186.1), rgb(102, 216, 204).
Aa
Black text reads best on this color (12.25:1).
About this color
#66D8CC is a light, moderately saturated teal or cyan. In OKLCH its lightness is 81%, its chroma 0.106 and its hue 186°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise (#40E0D0), ΔE 0.027 away. Black text reads best on it, at 12.25:1.
| Hue family | Teals and cyans |
| Lightness | light (81%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Turquoise (#40E0D0) |
| Black text | 12.25:1 |
| White text | 1.71:1 |
Values
| HEX | #66D8CC |
| RGB | rgb(102, 216, 204) |
| HSL | hsl(174, 59%, 62%) |
| OKLCH | oklch(81.3% 0.106 186.1) |
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 #66D8CC | 1.71:1 | Fails | Lc -34.4 | Non-text elements, placeholder text |
| Black text on #66D8CC | 12.25:1 | AAA | Lc 73.3 | Content text, not long reading |
| #66D8CC text on white | 1.71:1 | Fails | Lc 30.6 | Non-text elements, placeholder text |
| #66D8CC text on black | 12.25:1 | AAA | Lc -72.2 | 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
#ECF9F7
oklch(97.2% 0.014 186)
-
Step 100
100
#D4F1ED
oklch(93.6% 0.031 186.6)
-
Step 200
200
#AEE6DF
oklch(88.5% 0.058 186.7)
-
Step 300
300 (this color)
#66D8CC
oklch(81.3% 0.106 186.1)
-
Step 400
400
#00B9AC
oklch(70.7% 0.124 186)
-
Step 500
500
#009F94
oklch(63.2% 0.111 186.2)
-
Step 600
600
#00857C
oklch(55.5% 0.097 186.5)
-
Step 700
700
#007068
oklch(49.1% 0.086 186.2)
-
Step 800
800
#005C55
oklch(42.7% 0.075 185.9)
-
Step 900
900
#004D47
oklch(37.8% 0.066 185.9)
-
Step 950
950
#002E2A
oklch(27.1% 0.048 185.8)
#66D8CC 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) | #CECECC | 0.112 |
| Deuteranopia (no green cones) | #BCC0CD | 0.106 |
| Tritanopia (no blue cones) | #12DCD4 | 0.034 |
| Achromatopsia (no color) | #C6C6C6 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66D8CC
#66D8CC
oklch(81.3% 0.106 186.1)
- #FCA5B7
#FCA5B7
oklch(81.2% 0.105 6.2)
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 #66D8CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise #40E0D0 ΔE 0.027
- Medium Turquoise #48D1CC ΔE 0.030
- Seafoam Blue #78D1B6 ΔE 0.031
- Tiffany Blue #94D2BD ΔE 0.042
- Pale Teal #82CBB2 ΔE 0.043
- Medium Aquamarine #66CDAA ΔE 0.049
- Aqua Blue #02D8E9 ΔE 0.051
- Dark Turquoise #00CED1 ΔE 0.053
Use #66D8CC 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.