#66AEF2
Closest named color: Carolina Blue (#8AB8FE). oklch(73.2% 0.123 248.6), rgb(102, 174, 242).
Aa
Black text reads best on this color (8.90:1).
About this color
#66AEF2 is a medium-light, moderately saturated blue. In OKLCH its lightness is 73%, its chroma 0.123 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Carolina Blue (#8AB8FE), ΔE 0.051 away. Black text reads best on it, at 8.90:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Carolina Blue (#8AB8FE) |
| Black text | 8.90:1 |
| White text | 2.35:1 |
Values
| HEX | #66AEF2 |
| RGB | rgb(102, 174, 242) |
| HSL | hsl(209, 84%, 67%) |
| OKLCH | oklch(73.2% 0.123 248.6) |
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 #66AEF2 | 2.35:1 | Fails | Lc -51.2 | Large or bold text, headings |
| Black text on #66AEF2 | 8.90:1 | AAA | Lc 57.7 | Large or bold text, headings |
| #66AEF2 text on white | 2.35:1 | Fails | Lc 46.3 | Large or bold text, headings |
| #66AEF2 text on black | 8.90:1 | AAA | Lc -55.7 | Large or bold text, headings |
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 400.
-
Step 50
50
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFECF8
oklch(93.7% 0.021 245.9)
-
Step 200
200
#C4DCF5
oklch(88.5% 0.043 249.4)
-
Step 300
300
#9AC5F1
oklch(80.8% 0.078 249.4)
-
Step 400
400 (this color)
#66AEF2
oklch(73.2% 0.123 248.6)
-
Step 500
500
#248EE3
oklch(63.1% 0.157 248.4)
-
Step 600
600
#0077C7
oklch(55.7% 0.152 248.5)
-
Step 700
700
#0064A8
oklch(49.2% 0.133 248.3)
-
Step 800
800
#00518B
oklch(42.6% 0.117 248.8)
-
Step 900
900
#004475
oklch(37.8% 0.103 248.3)
-
Step 950
950
#062844
oklch(27% 0.065 248)
#66AEF2 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) | #91B0F5 | 0.048 |
| Deuteranopia (no green cones) | #7FA3F1 | 0.036 |
| Tritanopia (no blue cones) | #00BEC6 | 0.101 |
| Achromatopsia (no color) | #A9A9A9 | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66AEF2
#66AEF2
oklch(73.2% 0.123 248.6)
- #DA994A
#DA994A
oklch(73.2% 0.123 69)
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 #66AEF2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Carolina Blue #8AB8FE ΔE 0.051
- Deep Sky Blue #00BFFF ΔE 0.056
- Cornflower Blue #6495ED ΔE 0.067
- Periwinkle Blue #8F99FB ΔE 0.071
- Vivid Sky Blue #4CC9F0 ΔE 0.075
- Lightblue #7BC8F6 ΔE 0.076
- Chefchaouen Blue #4895EF ΔE 0.076
- Bright Sky Blue #02CCFE ΔE 0.082
Use #66AEF2 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.