#66ACFF
Closest named color: Carolina Blue (#8AB8FE). oklch(73.4% 0.141 253.8), rgb(102, 172, 255).
Aa
Black text reads best on this color (8.90:1).
About this color
#66ACFF is a medium-light, vivid blue. In OKLCH its lightness is 73%, its chroma 0.141 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Carolina Blue (#8AB8FE), ΔE 0.053 away. Black text reads best on it, at 8.90:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Carolina Blue (#8AB8FE) |
| Black text | 8.90:1 |
| White text | 2.35:1 |
Values
| HEX | #66ACFF |
| RGB | rgb(102, 172, 255) |
| HSL | hsl(213, 100%, 70%) |
| OKLCH | oklch(73.4% 0.141 253.8) |
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 #66ACFF | 2.35:1 | Fails | Lc -51.2 | Large or bold text, headings |
| Black text on #66ACFF | 8.90:1 | AAA | Lc 57.7 | Large or bold text, headings |
| #66ACFF text on white | 2.35:1 | Fails | Lc 46.2 | Large or bold text, headings |
| #66ACFF text on black | 8.90:1 | AAA | Lc -55.8 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C3DCF9
oklch(88.5% 0.048 252.2)
-
Step 300
300
#99C4F9
oklch(80.9% 0.088 254)
-
Step 400
400 (this color)
#66ACFF
oklch(73.4% 0.141 253.8)
-
Step 500
500
#268AF2
oklch(63.2% 0.179 253.6)
-
Step 600
600
#0072D6
oklch(55.6% 0.176 253.8)
-
Step 700
700
#0060B5
oklch(49.2% 0.155 253.6)
-
Step 800
800
#004E96
oklch(42.7% 0.135 253.8)
-
Step 900
900
#02417D
oklch(37.7% 0.117 253.6)
-
Step 950
950
#072749
oklch(27.1% 0.073 253.3)
#66ACFF 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) | #89B1FF | 0.041 |
| Deuteranopia (no green cones) | #74A2FD | 0.027 |
| Tritanopia (no blue cones) | #00BFCA | 0.116 |
| Achromatopsia (no color) | #A9A9A9 | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66ACFF
#66ACFF
oklch(73.4% 0.141 253.8)
- #DD9A2F
#DD9A2F
oklch(73.5% 0.14 74)
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 #66ACFF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Carolina Blue #8AB8FE ΔE 0.053
- Periwinkle Blue #8F99FB ΔE 0.061
- Deep Sky Blue #00BFFF ΔE 0.062
- Cornflower Blue #6495ED ΔE 0.062
- Chefchaouen Blue #4895EF ΔE 0.072
- Lightblue #7BC8F6 ΔE 0.085
- Vivid Sky Blue #4CC9F0 ΔE 0.088
- Pastel Blue #A2BFFE ΔE 0.088
Use #66ACFF 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.