#66CFEB
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(80.3% 0.104 217.7), rgb(102, 207, 235).
Aa
Black text reads best on this color (11.68:1).
About this color
#66CFEB is a light, moderately saturated teal or cyan. In OKLCH its lightness is 80%, its chroma 0.104 and its hue 218°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.028 away. Black text reads best on it, at 11.68:1.
| Hue family | Teals and cyans |
| Lightness | light (80%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 11.68:1 |
| White text | 1.79:1 |
Values
| HEX | #66CFEB |
| RGB | rgb(102, 207, 235) |
| HSL | hsl(193, 77%, 66%) |
| OKLCH | oklch(80.3% 0.104 217.7) |
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 #66CFEB | 1.79:1 | Fails | Lc -37.1 | Non-text elements, placeholder text |
| Black text on #66CFEB | 11.68:1 | AAA | Lc 70.8 | Content text, not long reading |
| #66CFEB text on white | 1.79:1 | Fails | Lc 33.1 | Non-text elements, placeholder text |
| #66CFEB text on black | 11.68:1 | AAA | Lc -69.6 | 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
#ECF8FC
oklch(97.1% 0.014 219.6)
-
Step 100
100
#D5EFF7
oklch(93.6% 0.029 218.2)
-
Step 200
200
#AEE3F3
oklch(88.4% 0.059 218.3)
-
Step 300
300 (this color)
#66CFEB
oklch(80.3% 0.104 217.7)
-
Step 400
400
#00B3D4
oklch(70.7% 0.127 217.3)
-
Step 500
500
#0099B6
oklch(63% 0.113 217.6)
-
Step 600
600
#00819A
oklch(55.7% 0.1 217.7)
-
Step 700
700
#006C82
oklch(49.1% 0.088 218.4)
-
Step 800
800
#00596B
oklch(42.8% 0.077 217.7)
-
Step 900
900
#004A59
oklch(37.7% 0.067 217.2)
-
Step 950
950
#002C36
oklch(27% 0.048 217.4)
#66CFEB 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) | #BDCAED | 0.091 |
| Deuteranopia (no green cones) | #A9BBEB | 0.082 |
| Tritanopia (no blue cones) | #00D9D8 | 0.059 |
| Achromatopsia (no color) | #C1C1C1 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66CFEB
#66CFEB
oklch(80.3% 0.104 217.7)
- #F9A78E
#F9A78E
oklch(80.3% 0.104 37.7)
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 #66CFEB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.028
- Sky Blue #87CEEB ΔE 0.029
- Lightblue #7BC8F6 ΔE 0.033
- Light Sky Blue #87CEFA ΔE 0.039
- Sky #82CAFC ΔE 0.041
- Aqua Blue #02D8E9 ΔE 0.042
- Bright Sky Blue #02CCFE ΔE 0.048
- Medium Turquoise #48D1CC ΔE 0.054
Use #66CFEB 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.