#66A3FA
Closest named color: Cornflower Blue (#6495ED). oklch(71.2% 0.143 257.4), rgb(102, 163, 250).
Aa
Black text reads best on this color (8.18:1).
About this color
#66A3FA is a medium-light, vivid blue. In OKLCH its lightness is 71%, its chroma 0.143 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.039 away. Black text reads best on it, at 8.18:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 8.18:1 |
| White text | 2.56:1 |
Values
| HEX | #66A3FA |
| RGB | rgb(102, 163, 250) |
| HSL | hsl(215, 94%, 69%) |
| OKLCH | oklch(71.2% 0.143 257.4) |
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 #66A3FA | 2.56:1 | Fails | Lc -55.1 | Large or bold text, headings |
| Black text on #66A3FA | 8.18:1 | AAA | Lc 54.0 | Large or bold text, headings |
| #66A3FA text on white | 2.56:1 | Fails | Lc 50.0 | Large or bold text, headings |
| #66A3FA text on black | 8.18:1 | AAA | Lc -51.9 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFC
oklch(93.6% 0.026 257)
-
Step 200
200
#C5DBFA
oklch(88.5% 0.049 256.9)
-
Step 300
300
#9CC3FA
oklch(80.9% 0.089 257)
-
Step 400
400 (this color)
#66A3FA
oklch(71.2% 0.143 257.4)
-
Step 500
500
#3687F5
oklch(63.1% 0.182 257.3)
-
Step 600
600
#046DE4
oklch(55.6% 0.199 257.5)
-
Step 700
700
#005BC2
oklch(49% 0.177 257.5)
-
Step 800
800
#014BA0
oklch(42.8% 0.152 257.2)
-
Step 900
900
#0F3F7F
oklch(37.6% 0.119 257.5)
-
Step 950
950
#0B264A
oklch(27.1% 0.074 256.8)
#66A3FA 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) | #7EA9FE | 0.032 |
| Deuteranopia (no green cones) | #6B9BF8 | 0.021 |
| Tritanopia (no blue cones) | #00B7C3 | 0.122 |
| Achromatopsia (no color) | #A2A2A2 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66A3FA
#66A3FA
oklch(71.2% 0.143 257.4)
- #D3951A
#D3951A
oklch(71.3% 0.143 77.6)
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 #66A3FA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.039
- Periwinkle Blue #8F99FB ΔE 0.051
- Chefchaouen Blue #4895EF ΔE 0.051
- Perrywinkle #8F8CE7 ΔE 0.071
- Soft Blue #6488EA ΔE 0.071
- Carolina Blue #8AB8FE ΔE 0.072
- Dark Sky Blue #448EE4 ΔE 0.072
- Lavender Blue #8B88F8 ΔE 0.076
Use #66A3FA 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.