#66CFDB
Closest named color: Medium Turquoise (#48D1CC). oklch(79.7% 0.098 205.3), rgb(102, 207, 219).
Aa
Black text reads best on this color (11.51:1).
About this color
#66CFDB is a light, moderately saturated teal or cyan. In OKLCH its lightness is 80%, its chroma 0.098 and its hue 205°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Turquoise (#48D1CC), ΔE 0.033 away. Black text reads best on it, at 11.51:1.
| Hue family | Teals and cyans |
| Lightness | light (80%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Medium Turquoise (#48D1CC) |
| Black text | 11.51:1 |
| White text | 1.82:1 |
Values
| HEX | #66CFDB |
| RGB | rgb(102, 207, 219) |
| HSL | hsl(186, 62%, 63%) |
| OKLCH | oklch(79.7% 0.098 205.3) |
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 #66CFDB | 1.82:1 | Fails | Lc -38.0 | Non-text elements, placeholder text |
| Black text on #66CFDB | 11.51:1 | AAA | Lc 70.0 | Content text, not long reading |
| #66CFDB text on white | 1.82:1 | Fails | Lc 33.9 | Non-text elements, placeholder text |
| #66CFDB text on black | 11.51:1 | AAA | Lc -68.7 | 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
#AFE4EA
oklch(88.4% 0.055 204.8)
-
Step 300
300 (this color)
#66CFDB
oklch(79.7% 0.098 205.3)
-
Step 400
400
#00B5C5
oklch(70.6% 0.121 206)
-
Step 500
500
#009CA9
oklch(63.2% 0.108 205.2)
-
Step 600
600
#00838E
oklch(55.7% 0.095 205.2)
-
Step 700
700
#006E77
oklch(49.1% 0.084 204.7)
-
Step 800
800
#005A62
oklch(42.7% 0.073 205.3)
-
Step 900
900
#004B52
oklch(37.7% 0.064 205.5)
-
Step 950
950
#002D31
oklch(27.1% 0.046 204.1)
#66CFDB 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) | #C1C8DC | 0.097 |
| Deuteranopia (no green cones) | #AEBADB | 0.089 |
| Tritanopia (no blue cones) | #00D6D2 | 0.046 |
| Achromatopsia (no color) | #C0C0C0 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66CFDB
#66CFDB
oklch(79.7% 0.098 205.3)
- #F6A49C
#F6A49C
oklch(79.7% 0.099 25.6)
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 #66CFDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Turquoise #48D1CC ΔE 0.033
- Aqua Blue #02D8E9 ΔE 0.040
- Sky Blue #87CEEB ΔE 0.040
- Vivid Sky Blue #4CC9F0 ΔE 0.042
- Dark Turquoise #00CED1 ΔE 0.045
- Lightblue #7BC8F6 ΔE 0.053
- Seafoam Blue #78D1B6 ΔE 0.055
- Light Cornflower Blue #98C1D9 ΔE 0.057
Use #66CFDB 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.