#66CDEB
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(79.8% 0.104 219.5), rgb(102, 205, 235).
Aa
Black text reads best on this color (11.49:1).
About this color
#66CDEB is a light, moderately saturated teal or cyan. In OKLCH its lightness is 80%, its chroma 0.104 and its hue 219°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.024 away. Black text reads best on it, at 11.49:1.
| Hue family | Teals and cyans |
| Lightness | light (80%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 11.49:1 |
| White text | 1.82:1 |
Values
| HEX | #66CDEB |
| RGB | rgb(102, 205, 235) |
| HSL | hsl(194, 77%, 66%) |
| OKLCH | oklch(79.8% 0.104 219.5) |
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 #66CDEB | 1.82:1 | Fails | Lc -38.0 | Non-text elements, placeholder text |
| Black text on #66CDEB | 11.49:1 | AAA | Lc 69.9 | Content text, not long reading |
| #66CDEB text on white | 1.82:1 | Fails | Lc 33.9 | Non-text elements, placeholder text |
| #66CDEB text on black | 11.49:1 | 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
#ECF8FC
oklch(97.1% 0.014 219.6)
-
Step 100
100
#D5EFF8
oklch(93.6% 0.03 220.6)
-
Step 200
200
#AFE3F4
oklch(88.5% 0.058 219.9)
-
Step 300
300 (this color)
#66CDEB
oklch(79.8% 0.104 219.5)
-
Step 400
400
#00B2D7
oklch(70.6% 0.128 219.8)
-
Step 500
500
#0099B9
oklch(63.1% 0.115 219.7)
-
Step 600
600
#00809C
oklch(55.5% 0.101 220.3)
-
Step 700
700
#006C83
oklch(49.1% 0.089 219.3)
-
Step 800
800
#00586C
oklch(42.6% 0.078 220.2)
-
Step 900
900
#004A5A
oklch(37.8% 0.068 218.5)
-
Step 950
950
#002C37
oklch(27.1% 0.049 219.4)
#66CDEB 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) | #BAC8ED | 0.088 |
| Deuteranopia (no green cones) | #A7B9EB | 0.080 |
| Tritanopia (no blue cones) | #00D7D6 | 0.061 |
| Achromatopsia (no color) | #C0C0C0 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66CDEB
#66CDEB
oklch(79.8% 0.104 219.5)
- #F7A68A
#F7A68A
oklch(79.8% 0.104 39.8)
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 #66CDEB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.024
- Sky Blue #87CEEB ΔE 0.030
- Lightblue #7BC8F6 ΔE 0.030
- Light Sky Blue #87CEFA ΔE 0.039
- Sky #82CAFC ΔE 0.039
- Aqua Blue #02D8E9 ΔE 0.045
- Bright Sky Blue #02CCFE ΔE 0.046
- Light Cornflower Blue #98C1D9 ΔE 0.053
Use #66CDEB 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.