#66CEFF
Closest named color: Lightblue (#7BC8F6). oklch(80.8% 0.119 231.2), rgb(102, 206, 255).
Aa
Black text reads best on this color (11.83:1).
About this color
#66CEFF is a light, moderately saturated blue. In OKLCH its lightness is 81%, its chroma 0.119 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Lightblue (#7BC8F6), ΔE 0.022 away. Black text reads best on it, at 11.83:1.
| Hue family | Blues |
| Lightness | light (81%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Lightblue (#7BC8F6) |
| Black text | 11.83:1 |
| White text | 1.77:1 |
Values
| HEX | #66CEFF |
| RGB | rgb(102, 206, 255) |
| HSL | hsl(199, 100%, 70%) |
| OKLCH | oklch(80.8% 0.119 231.2) |
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 #66CEFF | 1.77:1 | Fails | Lc -36.4 | Non-text elements, placeholder text |
| Black text on #66CEFF | 11.83:1 | AAA | Lc 71.4 | Content text, not long reading |
| #66CEFF text on white | 1.77:1 | Fails | Lc 32.4 | Non-text elements, placeholder text |
| #66CEFF text on black | 11.83:1 | AAA | Lc -70.3 | 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
#EBF8FE
oklch(97.1% 0.016 227)
-
Step 100
100
#D4EFFD
oklch(93.7% 0.034 230.2)
-
Step 200
200
#ADE2FD
oklch(88.5% 0.066 230.5)
-
Step 300
300 (this color)
#66CEFF
oklch(80.8% 0.119 231.2)
-
Step 400
400
#00AFE9
oklch(70.7% 0.143 231.2)
-
Step 500
500
#0096C8
oklch(63.1% 0.127 231)
-
Step 600
600
#007EA9
oklch(55.6% 0.112 231.2)
-
Step 700
700
#006A8E
oklch(49.1% 0.099 230.6)
-
Step 800
800
#005775
oklch(42.8% 0.086 230.3)
-
Step 900
900
#004862
oklch(37.7% 0.076 230.8)
-
Step 950
950
#002B3C
oklch(27.1% 0.054 230.4)
#66CEFF 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) | #B6CBFF | 0.081 |
| Deuteranopia (no green cones) | #A0BBFE | 0.071 |
| Tritanopia (no blue cones) | #00DBDE | 0.078 |
| Achromatopsia (no color) | #C2C2C2 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66CEFF
#66CEFF
oklch(80.8% 0.119 231.2)
- #FDAA78
#FDAA78
oklch(80.8% 0.118 51.5)
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 #66CEFF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Lightblue #7BC8F6 ΔE 0.022
- Sky #82CAFC ΔE 0.024
- Light Sky Blue #87CEFA ΔE 0.029
- Vivid Sky Blue #4CC9F0 ΔE 0.032
- Sky Blue #87CEEB ΔE 0.038
- Bright Sky Blue #02CCFE ΔE 0.040
- Baby Blue #A2CFFE ΔE 0.058
- Aqua Blue #02D8E9 ΔE 0.061
Use #66CEFF 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.