#66D0DD
Closest named color: Medium Turquoise (#48D1CC). oklch(80% 0.099 206.1), rgb(102, 208, 221).
Aa
Black text reads best on this color (11.63:1).
About this color
#66D0DD is a light, moderately saturated teal or cyan. In OKLCH its lightness is 80%, its chroma 0.099 and its hue 206°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Turquoise (#48D1CC), ΔE 0.034 away. Black text reads best on it, at 11.63:1.
| Hue family | Teals and cyans |
| Lightness | light (80%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Medium Turquoise (#48D1CC) |
| Black text | 11.63:1 |
| White text | 1.80:1 |
Values
| HEX | #66D0DD |
| RGB | rgb(102, 208, 221) |
| HSL | hsl(187, 64%, 63%) |
| OKLCH | oklch(80% 0.099 206.1) |
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 #66D0DD | 1.80:1 | Fails | Lc -37.4 | Non-text elements, placeholder text |
| Black text on #66D0DD | 11.63:1 | AAA | Lc 70.5 | Content text, not long reading |
| #66D0DD text on white | 1.80:1 | Fails | Lc 33.3 | Non-text elements, placeholder text |
| #66D0DD 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
#ECF8FA
oklch(97.1% 0.013 208.8)
-
Step 100
100
#D5F0F3
oklch(93.6% 0.029 204.8)
-
Step 200
200
#AFE4EB
oklch(88.5% 0.055 206.3)
-
Step 300
300 (this color)
#66D0DD
oklch(80% 0.099 206.1)
-
Step 400
400
#00B5C5
oklch(70.6% 0.121 206)
-
Step 500
500
#009BA9
oklch(63% 0.108 206.1)
-
Step 600
600
#00838F
oklch(55.7% 0.095 206.1)
-
Step 700
700
#006E78
oklch(49.1% 0.084 205.8)
-
Step 800
800
#005A63
oklch(42.7% 0.073 206.6)
-
Step 900
900
#004B52
oklch(37.7% 0.064 205.5)
-
Step 950
950
#002D31
oklch(27.1% 0.046 204.1)
#66D0DD 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) | #C1C9DE | 0.097 |
| Deuteranopia (no green cones) | #AFBBDD | 0.090 |
| Tritanopia (no blue cones) | #00D8D4 | 0.047 |
| Achromatopsia (no color) | #C1C1C1 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66D0DD
#66D0DD
oklch(80% 0.099 206.1)
- #F7A59C
#F7A59C
oklch(80% 0.099 26.4)
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 #66D0DD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Turquoise #48D1CC ΔE 0.034
- Aqua Blue #02D8E9 ΔE 0.038
- Sky Blue #87CEEB ΔE 0.038
- Vivid Sky Blue #4CC9F0 ΔE 0.042
- Dark Turquoise #00CED1 ΔE 0.046
- Lightblue #7BC8F6 ΔE 0.052
- Light Sky Blue #87CEFA ΔE 0.056
- Turquoise #40E0D0 ΔE 0.057
Use #66D0DD 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.