#66A4E8
Closest named color: Cornflower Blue (#6495ED). oklch(70.5% 0.119 251.9), rgb(102, 164, 232).
Aa
Black text reads best on this color (8.04:1).
About this color
#66A4E8 is a medium-light, moderately saturated blue. In OKLCH its lightness is 71%, its chroma 0.119 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.043 away. Black text reads best on it, at 8.04:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 8.04:1 |
| White text | 2.61:1 |
Values
| HEX | #66A4E8 |
| RGB | rgb(102, 164, 232) |
| HSL | hsl(211, 74%, 65%) |
| OKLCH | oklch(70.5% 0.119 251.9) |
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 #66A4E8 | 2.61:1 | Fails | Lc -56.0 | Large or bold text, headings |
| Black text on #66A4E8 | 8.04:1 | AAA | Lc 53.2 | Large or bold text, headings |
| #66A4E8 text on white | 2.61:1 | Fails | Lc 50.8 | Large or bold text, headings |
| #66A4E8 text on black | 8.04:1 | AAA | Lc -51.1 | 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
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C6DCF4
oklch(88.6% 0.041 250.6)
-
Step 300
300
#9EC4F0
oklch(80.8% 0.075 252.4)
-
Step 400
400 (this color)
#66A4E8
oklch(70.5% 0.119 251.9)
-
Step 500
500
#388CE2
oklch(63.1% 0.153 252)
-
Step 600
600
#0074D0
oklch(55.6% 0.166 251.9)
-
Step 700
700
#0061B0
oklch(49% 0.147 252)
-
Step 800
800
#004F92
oklch(42.6% 0.129 252.3)
-
Step 900
900
#104374
oklch(37.8% 0.099 251.7)
-
Step 950
950
#0C2744
oklch(26.9% 0.063 252.6)
#66A4E8 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) | #88A7EB | 0.040 |
| Deuteranopia (no green cones) | #779AE7 | 0.030 |
| Tritanopia (no blue cones) | #00B4BC | 0.104 |
| Achromatopsia (no color) | #A0A0A0 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66A4E8
#66A4E8
oklch(70.5% 0.119 251.9)
- #CE9343
#CE9343
oklch(70.6% 0.119 71.8)
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 #66A4E8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.043
- Chefchaouen Blue #4895EF ΔE 0.055
- Periwinkle Blue #8F99FB ΔE 0.064
- Dark Sky Blue #448EE4 ΔE 0.071
- Carolina Blue #8AB8FE ΔE 0.074
- Perrywinkle #8F8CE7 ΔE 0.074
- Greyblue #77A1B5 ΔE 0.075
- Soft Blue #6488EA ΔE 0.076
Use #66A4E8 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.