#66A3EF
Closest named color: Cornflower Blue (#6495ED). oklch(70.6% 0.129 254.7), rgb(102, 163, 239).
Aa
Black text reads best on this color (8.05:1).
About this color
#66A3EF is a medium-light, moderately saturated blue. In OKLCH its lightness is 71%, its chroma 0.129 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.038 away. Black text reads best on it, at 8.05:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 8.05:1 |
| White text | 2.60:1 |
Values
| HEX | #66A3EF |
| RGB | rgb(102, 163, 239) |
| HSL | hsl(213, 81%, 67%) |
| OKLCH | oklch(70.6% 0.129 254.7) |
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 #66A3EF | 2.60:1 | Fails | Lc -55.9 | Large or bold text, headings |
| Black text on #66A3EF | 8.05:1 | AAA | Lc 53.3 | Large or bold text, headings |
| #66A3EF text on white | 2.60:1 | Fails | Lc 50.7 | Large or bold text, headings |
| #66A3EF text on black | 8.05:1 | AAA | Lc -51.2 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C6DBF7
oklch(88.5% 0.045 255.6)
-
Step 300
300
#9DC4F4
oklch(80.9% 0.08 253.9)
-
Step 400
400 (this color)
#66A3EF
oklch(70.6% 0.129 254.7)
-
Step 500
500
#388AEA
oklch(63.1% 0.165 254.6)
-
Step 600
600
#0571D8
oklch(55.5% 0.179 254.7)
-
Step 700
700
#005FB8
oklch(49.1% 0.16 254.6)
-
Step 800
800
#024D98
oklch(42.6% 0.139 255)
-
Step 900
900
#104179
oklch(37.7% 0.108 254.9)
-
Step 950
950
#0C2747
oklch(27.1% 0.068 254.6)
#66A3EF 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) | #84A7F2 | 0.036 |
| Deuteranopia (no green cones) | #729AED | 0.025 |
| Tritanopia (no blue cones) | #00B4BE | 0.111 |
| Achromatopsia (no color) | #A0A0A0 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66A3EF
#66A3EF
oklch(70.6% 0.129 254.7)
- #CF9335
#CF9335
oklch(70.6% 0.129 74.5)
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 #66A3EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.038
- Chefchaouen Blue #4895EF ΔE 0.050
- Periwinkle Blue #8F99FB ΔE 0.057
- Dark Sky Blue #448EE4 ΔE 0.069
- Perrywinkle #8F8CE7 ΔE 0.071
- Soft Blue #6488EA ΔE 0.071
- Carolina Blue #8AB8FE ΔE 0.073
- Deep Sky Blue #00BFFF ΔE 0.078
Use #66A3EF 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.