#66AFEF
Closest named color: Carolina Blue (#8AB8FE). oklch(73.3% 0.119 246.7), rgb(102, 175, 239).
Aa
Black text reads best on this color (8.94:1).
About this color
#66AFEF is a medium-light, moderately saturated blue. In OKLCH its lightness is 73%, its chroma 0.119 and its hue 247°. 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 8.94:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Carolina Blue (#8AB8FE) |
| Black text | 8.94:1 |
| White text | 2.34:1 |
Values
| HEX | #66AFEF |
| RGB | rgb(102, 175, 239) |
| HSL | hsl(208, 81%, 67%) |
| OKLCH | oklch(73.3% 0.119 246.7) |
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 #66AFEF | 2.34:1 | Fails | Lc -51.0 | Large or bold text, headings |
| Black text on #66AFEF | 8.94:1 | AAA | Lc 57.9 | Large or bold text, headings |
| #66AFEF text on white | 2.34:1 | Fails | Lc 46.1 | Large or bold text, headings |
| #66AFEF text on black | 8.94:1 | AAA | Lc -56.0 | 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
#C4DCF3
oklch(88.4% 0.041 247.1)
-
Step 300
300
#9AC6EE
oklch(80.9% 0.074 246.3)
-
Step 400
400 (this color)
#66AFEF
oklch(73.3% 0.119 246.7)
-
Step 500
500
#238FDF
oklch(63.1% 0.152 246.7)
-
Step 600
600
#0078C3
oklch(55.7% 0.146 246.8)
-
Step 700
700
#0065A5
oklch(49.2% 0.128 246.7)
-
Step 800
800
#005288
oklch(42.7% 0.112 246.9)
-
Step 900
900
#004472
oklch(37.6% 0.099 246.8)
-
Step 950
950
#062843
oklch(26.9% 0.063 247.1)
#66AFEF 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) | #94B1F2 | 0.051 |
| Deuteranopia (no green cones) | #81A3EE | 0.039 |
| Tritanopia (no blue cones) | #00BEC5 | 0.097 |
| Achromatopsia (no color) | #A9A9A9 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66AFEF
#66AFEF
oklch(73.3% 0.119 246.7)
- #DA9950
#DA9950
oklch(73.2% 0.119 67.2)
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 #66AFEF, 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 0.055
- Cornflower Blue #6495ED ΔE 0.070
- Vivid Sky Blue #4CC9F0 ΔE 0.071
- Lightblue #7BC8F6 ΔE 0.073
- Periwinkle Blue #8F99FB ΔE 0.075
- Bright Sky Blue #02CCFE ΔE 0.080
- Chefchaouen Blue #4895EF ΔE 0.080
Use #66AFEF 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.