#66AFFF
Closest named color: Carolina Blue (#8AB8FE). oklch(74% 0.138 252.1), rgb(102, 175, 255).
Aa
Black text reads best on this color (9.14:1).
About this color
#66AFFF is a medium-light, moderately saturated blue. In OKLCH its lightness is 74%, its chroma 0.138 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Carolina Blue (#8AB8FE), ΔE 0.047 away. Black text reads best on it, at 9.14:1.
| Hue family | Blues |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Carolina Blue (#8AB8FE) |
| Black text | 9.14:1 |
| White text | 2.29:1 |
Values
| HEX | #66AFFF |
| RGB | rgb(102, 175, 255) |
| HSL | hsl(211, 100%, 70%) |
| OKLCH | oklch(74% 0.138 252.1) |
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 #66AFFF | 2.29:1 | Fails | Lc -50.0 | Large or bold text, headings |
| Black text on #66AFFF | 9.14:1 | AAA | Lc 58.9 | Large or bold text, headings |
| #66AFFF text on white | 2.29:1 | Fails | Lc 45.1 | Large or bold text, headings |
| #66AFFF text on black | 9.14:1 | AAA | Lc -57.0 | 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
#DEEBFB
oklch(93.5% 0.026 253.6)
-
Step 200
200
#C3DCF9
oklch(88.5% 0.048 252.2)
-
Step 300
300
#98C5F7
oklch(81% 0.086 251.5)
-
Step 400
400 (this color)
#66AFFF
oklch(74% 0.138 252.1)
-
Step 500
500
#1F8BEF
oklch(63.1% 0.176 252)
-
Step 600
600
#0074D1
oklch(55.7% 0.167 252.1)
-
Step 700
700
#0061B1
oklch(49.1% 0.148 252.3)
-
Step 800
800
#004F92
oklch(42.6% 0.129 252.3)
-
Step 900
900
#00427B
oklch(37.7% 0.113 252.1)
-
Step 950
950
#052748
oklch(27% 0.072 251.7)
#66AFFF 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) | #8DB3FF | 0.043 |
| Deuteranopia (no green cones) | #79A4FD | 0.032 |
| Tritanopia (no blue cones) | #00C1CC | 0.112 |
| Achromatopsia (no color) | #ABABAB | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66AFFF
#66AFFF
oklch(74% 0.138 252.1)
- #E09B37
#E09B37
oklch(74% 0.138 72.1)
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 #66AFFF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Carolina Blue #8AB8FE ΔE 0.047
- Deep Sky Blue #00BFFF ΔE 0.056
- Periwinkle Blue #8F99FB ΔE 0.067
- Cornflower Blue #6495ED ΔE 0.070
- Lightblue #7BC8F6 ΔE 0.078
- Chefchaouen Blue #4895EF ΔE 0.079
- Vivid Sky Blue #4CC9F0 ΔE 0.080
- Pastel Blue #A2BFFE ΔE 0.083
Use #66AFFF 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.