#66CFDD
Closest named color: Medium Turquoise (#48D1CC). oklch(79.7% 0.099 207), rgb(102, 207, 221).
Aa
Black text reads best on this color (11.53:1).
About this color
#66CFDD is a light, moderately saturated teal or cyan. In OKLCH its lightness is 80%, its chroma 0.099 and its hue 207°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Turquoise (#48D1CC), ΔE 0.035 away. Black text reads best on it, at 11.53:1.
| Hue family | Teals and cyans |
| Lightness | light (80%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Medium Turquoise (#48D1CC) |
| Black text | 11.53:1 |
| White text | 1.82:1 |
Values
| HEX | #66CFDD |
| RGB | rgb(102, 207, 221) |
| HSL | hsl(187, 64%, 63%) |
| OKLCH | oklch(79.7% 0.099 207) |
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 #66CFDD | 1.82:1 | Fails | Lc -37.9 | Non-text elements, placeholder text |
| Black text on #66CFDD | 11.53:1 | AAA | Lc 70.1 | Content text, not long reading |
| #66CFDD text on white | 1.82:1 | Fails | Lc 33.8 | Non-text elements, placeholder text |
| #66CFDD text on black | 11.53:1 | AAA | Lc -68.8 | 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
#D5F0F4
oklch(93.7% 0.029 207.4)
-
Step 200
200
#AFE4EC
oklch(88.5% 0.055 207.7)
-
Step 300
300 (this color)
#66CFDD
oklch(79.7% 0.099 207)
-
Step 400
400
#00B5C7
oklch(70.7% 0.121 207.4)
-
Step 500
500
#009BAA
oklch(63% 0.108 206.9)
-
Step 600
600
#00838F
oklch(55.7% 0.095 206.1)
-
Step 700
700
#006E79
oklch(49.2% 0.084 206.9)
-
Step 800
800
#005A63
oklch(42.7% 0.073 206.6)
-
Step 900
900
#004B53
oklch(37.7% 0.065 207)
-
Step 950
950
#002D32
oklch(27.1% 0.046 206.3)
#66CFDD 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) | #C0C8DE | 0.096 |
| Deuteranopia (no green cones) | #AEBADD | 0.089 |
| Tritanopia (no blue cones) | #00D7D3 | 0.048 |
| Achromatopsia (no color) | #C0C0C0 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66CFDD
#66CFDD
oklch(79.7% 0.099 207)
- #F6A49B
#F6A49B
oklch(79.7% 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 #66CFDD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Turquoise #48D1CC ΔE 0.035
- Sky Blue #87CEEB ΔE 0.038
- Aqua Blue #02D8E9 ΔE 0.039
- Vivid Sky Blue #4CC9F0 ΔE 0.040
- Dark Turquoise #00CED1 ΔE 0.046
- Lightblue #7BC8F6 ΔE 0.050
- Light Sky Blue #87CEFA ΔE 0.055
- Light Cornflower Blue #98C1D9 ΔE 0.056
Use #66CFDD 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.