#66ADEB
Closest named color: Carolina Blue (#8AB8FE). oklch(72.6% 0.116 246.6), rgb(102, 173, 235).
Aa
Black text reads best on this color (8.74:1).
About this color
#66ADEB is a medium-light, moderately saturated blue. In OKLCH its lightness is 73%, its chroma 0.116 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Carolina Blue (#8AB8FE), ΔE 0.056 away. Black text reads best on it, at 8.74:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Carolina Blue (#8AB8FE) |
| Black text | 8.74:1 |
| White text | 2.40:1 |
Values
| HEX | #66ADEB |
| RGB | rgb(102, 173, 235) |
| HSL | hsl(208, 77%, 66%) |
| OKLCH | oklch(72.6% 0.116 246.6) |
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 #66ADEB | 2.40:1 | Fails | Lc -52.1 | Large or bold text, headings |
| Black text on #66ADEB | 8.74:1 | AAA | Lc 56.8 | Large or bold text, headings |
| #66ADEB text on white | 2.40:1 | Fails | Lc 47.1 | Large or bold text, headings |
| #66ADEB text on black | 8.74:1 | AAA | Lc -54.9 | 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
#DFECF7
oklch(93.7% 0.02 243.4)
-
Step 200
200
#C4DCF3
oklch(88.4% 0.041 247.1)
-
Step 300
300
#9BC6ED
oklch(80.9% 0.072 246.2)
-
Step 400
400 (this color)
#66ADEB
oklch(72.6% 0.116 246.6)
-
Step 500
500
#288FDD
oklch(63.1% 0.148 246.7)
-
Step 600
600
#0078C2
oklch(55.6% 0.145 246.5)
-
Step 700
700
#0065A4
oklch(49.2% 0.127 246.3)
-
Step 800
800
#005288
oklch(42.7% 0.112 246.9)
-
Step 900
900
#034471
oklch(37.6% 0.096 246.9)
-
Step 950
950
#072842
oklch(26.9% 0.061 246.8)
#66ADEB 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) | #93AFEE | 0.050 |
| Deuteranopia (no green cones) | #81A1EA | 0.040 |
| Tritanopia (no blue cones) | #00BCC2 | 0.097 |
| Achromatopsia (no color) | #A7A7A7 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66ADEB
#66ADEB
oklch(72.6% 0.116 246.6)
- #D79752
#D79752
oklch(72.5% 0.115 66.3)
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 #66ADEB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Carolina Blue #8AB8FE ΔE 0.056
- Deep Sky Blue #00BFFF ΔE 0.059
- Cornflower Blue #6495ED ΔE 0.066
- Periwinkle Blue #8F99FB ΔE 0.075
- Vivid Sky Blue #4CC9F0 ΔE 0.075
- Chefchaouen Blue #4895EF ΔE 0.076
- Greyblue #77A1B5 ΔE 0.078
- Lightblue #7BC8F6 ΔE 0.078
Use #66ADEB 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.