#66B6FC
Closest named color: Carolina Blue (#8AB8FE). oklch(75.4% 0.129 246.9), rgb(102, 182, 252).
Aa
Black text reads best on this color (9.66:1).
About this color
#66B6FC is a medium-light, moderately saturated blue. In OKLCH its lightness is 75%, its chroma 0.129 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Carolina Blue (#8AB8FE), ΔE 0.037 away. Black text reads best on it, at 9.66:1.
| Hue family | Blues |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Carolina Blue (#8AB8FE) |
| Black text | 9.66:1 |
| White text | 2.17:1 |
Values
| HEX | #66B6FC |
| RGB | rgb(102, 182, 252) |
| HSL | hsl(208, 96%, 69%) |
| OKLCH | oklch(75.4% 0.129 246.9) |
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 #66B6FC | 2.17:1 | Fails | Lc -47.2 | Large or bold text, headings |
| Black text on #66B6FC | 9.66:1 | AAA | Lc 61.4 | Content text, not long reading |
| #66B6FC text on white | 2.17:1 | Fails | Lc 42.5 | Non-text elements, placeholder text |
| #66B6FC text on black | 9.66:1 | AAA | Lc -59.7 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DEECF9
oklch(93.6% 0.023 246)
-
Step 200
200
#C2DDF6
oklch(88.6% 0.045 246.3)
-
Step 300
300
#96C6F2
oklch(80.8% 0.08 246.6)
-
Step 400
400 (this color)
#66B6FC
oklch(75.4% 0.129 246.9)
-
Step 500
500
#058FE6
oklch(63.2% 0.164 246.7)
-
Step 600
600
#0078C3
oklch(55.7% 0.146 246.8)
-
Step 700
700
#0064A5
oklch(49% 0.13 247.2)
-
Step 800
800
#005288
oklch(42.7% 0.112 246.9)
-
Step 900
900
#004473
oklch(37.7% 0.1 247.4)
-
Step 950
950
#022845
oklch(26.9% 0.068 246.8)
#66B6FC 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) | #98B8FF | 0.054 |
| Deuteranopia (no green cones) | #84A9FB | 0.042 |
| Tritanopia (no blue cones) | #00C7CE | 0.104 |
| Achromatopsia (no color) | #B0B0B0 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66B6FC
#66B6FC
oklch(75.4% 0.129 246.9)
- #E59E4D
#E59E4D
oklch(75.4% 0.128 67.1)
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 #66B6FC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Carolina Blue #8AB8FE ΔE 0.037
- Deep Sky Blue #00BFFF ΔE 0.045
- Lightblue #7BC8F6 ΔE 0.058
- Vivid Sky Blue #4CC9F0 ΔE 0.060
- Sky #82CAFC ΔE 0.064
- Bright Sky Blue #02CCFE ΔE 0.066
- Pastel Blue #A2BFFE ΔE 0.071
- Light Sky Blue #87CEFA ΔE 0.077
Use #66B6FC 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.