#66A8EA
Closest named color: Cornflower Blue (#6495ED). oklch(71.5% 0.118 249.8), rgb(102, 168, 234).
Aa
Black text reads best on this color (8.35:1).
About this color
#66A8EA is a medium-light, moderately saturated blue. In OKLCH its lightness is 71%, its chroma 0.118 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.053 away. Black text reads best on it, at 8.35:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 8.35:1 |
| White text | 2.51:1 |
Values
| HEX | #66A8EA |
| RGB | rgb(102, 168, 234) |
| HSL | hsl(210, 76%, 66%) |
| OKLCH | oklch(71.5% 0.118 249.8) |
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 #66A8EA | 2.51:1 | Fails | Lc -54.2 | Large or bold text, headings |
| Black text on #66A8EA | 8.35:1 | AAA | Lc 54.9 | Large or bold text, headings |
| #66A8EA text on white | 2.51:1 | Fails | Lc 49.1 | Large or bold text, headings |
| #66A8EA text on black | 8.35:1 | AAA | Lc -52.8 | 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)
#66A8EA
oklch(71.5% 0.118 249.8)
-
Step 500
500
#318DE0
oklch(63% 0.151 249.8)
-
Step 600
600
#0076CA
oklch(55.7% 0.156 249.7)
-
Step 700
700
#0063AB
oklch(49.2% 0.138 249.7)
-
Step 800
800
#00518D
oklch(42.7% 0.12 249.5)
-
Step 900
900
#0A4373
oklch(37.6% 0.099 249.9)
-
Step 950
950
#0A2843
oklch(27% 0.061 249.3)
#66A8EA 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) | #8CABED | 0.044 |
| Deuteranopia (no green cones) | #7B9EE9 | 0.032 |
| Tritanopia (no blue cones) | #00B7BF | 0.100 |
| Achromatopsia (no color) | #A3A3A3 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66A8EA
#66A8EA
oklch(71.5% 0.118 249.8)
- #D29549
#D29549
oklch(71.5% 0.118 69.8)
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 #66A8EA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.053
- Chefchaouen Blue #4895EF ΔE 0.064
- Carolina Blue #8AB8FE ΔE 0.065
- Periwinkle Blue #8F99FB ΔE 0.067
- Deep Sky Blue #00BFFF ΔE 0.068
- Greyblue #77A1B5 ΔE 0.076
- Dark Sky Blue #448EE4 ΔE 0.081
- Perrywinkle #8F8CE7 ΔE 0.082
Use #66A8EA 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.