#66AAEB
Closest named color: Cornflower Blue (#6495ED). oklch(72% 0.118 248.7), rgb(102, 170, 235).
Aa
Black text reads best on this color (8.51:1).
About this color
#66AAEB is a medium-light, moderately saturated blue. In OKLCH its lightness is 72%, its chroma 0.118 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.058 away. Black text reads best on it, at 8.51:1.
| Hue family | Blues |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 8.51:1 |
| White text | 2.46:1 |
Values
| HEX | #66AAEB |
| RGB | rgb(102, 170, 235) |
| HSL | hsl(209, 77%, 66%) |
| OKLCH | oklch(72% 0.118 248.7) |
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 #66AAEB | 2.46:1 | Fails | Lc -53.3 | Large or bold text, headings |
| Black text on #66AAEB | 8.51:1 | AAA | Lc 55.7 | Large or bold text, headings |
| #66AAEB text on white | 2.46:1 | Fails | Lc 48.3 | Large or bold text, headings |
| #66AAEB text on black | 8.51:1 | AAA | Lc -53.7 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#DFEBF8
oklch(93.5% 0.022 250.2)
-
Step 200
200
#C5DCF4
oklch(88.5% 0.041 249.4)
-
Step 300
300
#9CC5EF
oklch(80.9% 0.074 249.4)
-
Step 400
400 (this color)
#66AAEB
oklch(72% 0.118 248.7)
-
Step 500
500
#2E8EE0
oklch(63.2% 0.151 248.9)
-
Step 600
600
#0077C7
oklch(55.7% 0.152 248.5)
-
Step 700
700
#0063A9
oklch(49% 0.136 249.1)
-
Step 800
800
#00518B
oklch(42.6% 0.117 248.8)
-
Step 900
900
#074473
oklch(37.8% 0.098 248.6)
-
Step 950
950
#092843
oklch(27% 0.062 248.7)
#66AAEB 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) | #8FACEE | 0.046 |
| Deuteranopia (no green cones) | #7D9FEA | 0.035 |
| Tritanopia (no blue cones) | #00B9C1 | 0.098 |
| Achromatopsia (no color) | #A5A5A5 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66AAEB
#66AAEB
oklch(72% 0.118 248.7)
- #D4964B
#D4964B
oklch(71.9% 0.118 69.1)
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 #66AAEB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.058
- Carolina Blue #8AB8FE ΔE 0.061
- Deep Sky Blue #00BFFF ΔE 0.064
- Chefchaouen Blue #4895EF ΔE 0.068
- Periwinkle Blue #8F99FB ΔE 0.069
- Greyblue #77A1B5 ΔE 0.077
- Vivid Sky Blue #4CC9F0 ΔE 0.083
- Bluegrey #85A3B2 ΔE 0.084
Use #66AAEB 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.