#66D4FF
Closest named color: Light Sky Blue (#87CEFA). oklch(82.2% 0.117 226.5), rgb(102, 212, 255).
Aa
Black text reads best on this color (12.42:1).
About this color
#66D4FF is a light, moderately saturated teal or cyan. In OKLCH its lightness is 82%, its chroma 0.117 and its hue 227°. Its hue sits on the cool side of the wheel. The nearest named color is Light Sky Blue (#87CEFA), ΔE 0.029 away. Black text reads best on it, at 12.42:1.
| Hue family | Teals and cyans |
| Lightness | light (82%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Light Sky Blue (#87CEFA) |
| Black text | 12.42:1 |
| White text | 1.68:1 |
Values
| HEX | #66D4FF |
| RGB | rgb(102, 212, 255) |
| HSL | hsl(197, 100%, 70%) |
| OKLCH | oklch(82.2% 0.117 226.5) |
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 #66D4FF | 1.68:1 | Fails | Lc -33.6 | Non-text elements, placeholder text |
| Black text on #66D4FF | 12.42:1 | AAA | Lc 74.0 | Content text, not long reading |
| #66D4FF text on white | 1.68:1 | Fails | Lc 29.8 | Dividers and decoration only |
| #66D4FF text on black | 12.42:1 | AAA | Lc -73.0 | 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
#D3EFFC
oklch(93.6% 0.034 227.4)
-
Step 200
200
#ACE3FB
oklch(88.6% 0.065 226.6)
-
Step 300
300 (this color)
#66D4FF
oklch(82.2% 0.117 226.5)
-
Step 400
400
#00B0E1
oklch(70.6% 0.136 226.7)
-
Step 500
500
#0097C2
oklch(63.1% 0.122 226.9)
-
Step 600
600
#007FA3
oklch(55.6% 0.107 226.4)
-
Step 700
700
#006B8A
oklch(49.2% 0.095 226.5)
-
Step 800
800
#005771
oklch(42.6% 0.082 226.6)
-
Step 900
900
#00495F
oklch(37.8% 0.072 226.2)
-
Step 950
950
#002B3A
oklch(27% 0.052 227.2)
#66D4FF 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) | #BDD0FF | 0.088 |
| Deuteranopia (no green cones) | #A7C0FF | 0.078 |
| Tritanopia (no blue cones) | #00E1E2 | 0.073 |
| Achromatopsia (no color) | #C7C7C7 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66D4FF
#66D4FF
oklch(82.2% 0.117 226.5)
- #FFAF88
#FFAF88
oklch(82.2% 0.108 46.8)
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 #66D4FF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Sky Blue #87CEFA ΔE 0.029
- Sky #82CAFC ΔE 0.032
- Lightblue #7BC8F6 ΔE 0.033
- Sky Blue #87CEEB ΔE 0.036
- Vivid Sky Blue #4CC9F0 ΔE 0.040
- Bright Sky Blue #02CCFE ΔE 0.048
- Aqua Blue #02D8E9 ΔE 0.054
- Baby Blue #A2CFFE ΔE 0.056
Use #66D4FF 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.