#66C8FD
Closest named color: Lightblue (#7BC8F6). oklch(79.4% 0.119 234.7), rgb(102, 200, 253).
Aa
Black text reads best on this color (11.24:1).
About this color
#66C8FD is a light, moderately saturated blue. In OKLCH its lightness is 79%, its chroma 0.119 and its hue 235°. Its hue sits on the cool side of the wheel. The nearest named color is Lightblue (#7BC8F6), ΔE 0.020 away. Black text reads best on it, at 11.24:1.
| Hue family | Blues |
| Lightness | light (79%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Lightblue (#7BC8F6) |
| Black text | 11.24:1 |
| White text | 1.86:1 |
Values
| HEX | #66C8FD |
| RGB | rgb(102, 200, 253) |
| HSL | hsl(201, 97%, 70%) |
| OKLCH | oklch(79.4% 0.119 234.7) |
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 #66C8FD | 1.86:1 | Fails | Lc -39.3 | Non-text elements, placeholder text |
| Black text on #66C8FD | 11.24:1 | AAA | Lc 68.8 | Content text, not long reading |
| #66C8FD text on white | 1.86:1 | Fails | Lc 35.1 | Non-text elements, placeholder text |
| #66C8FD text on black | 11.24:1 | AAA | Lc -67.5 | Content text, not long reading |
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 300.
-
Step 50
50
#ECF8FF
oklch(97.2% 0.016 233)
-
Step 100
100
#D5EEFE
oklch(93.6% 0.034 235.9)
-
Step 200
200
#AFE1FF
oklch(88.5% 0.066 234.8)
-
Step 300
300 (this color)
#66C8FD
oklch(79.4% 0.119 234.7)
-
Step 400
400
#00AEEF
oklch(70.8% 0.149 234.4)
-
Step 500
500
#0095CE
oklch(63.2% 0.133 234.7)
-
Step 600
600
#007DAD
oklch(55.6% 0.117 234.3)
-
Step 700
700
#006992
oklch(49.1% 0.103 234.3)
-
Step 800
800
#005679
oklch(42.8% 0.09 234.7)
-
Step 900
900
#004765
oklch(37.6% 0.08 234.9)
-
Step 950
950
#002A3E
oklch(26.9% 0.057 235.2)
#66C8FD 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) | #AFC6FF | 0.075 |
| Deuteranopia (no green cones) | #9AB7FC | 0.064 |
| Tritanopia (no blue cones) | #00D6DA | 0.083 |
| Achromatopsia (no color) | #BEBEBE | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66C8FD
#66C8FD
oklch(79.4% 0.119 234.7)
- #F7A76F
#F7A76F
oklch(79.5% 0.119 55.1)
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 #66C8FD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Lightblue #7BC8F6 ΔE 0.020
- Sky #82CAFC ΔE 0.026
- Vivid Sky Blue #4CC9F0 ΔE 0.028
- Light Sky Blue #87CEFA ΔE 0.036
- Bright Sky Blue #02CCFE ΔE 0.039
- Sky Blue #87CEEB ΔE 0.045
- Carolina Blue #8AB8FE ΔE 0.051
- Deep Sky Blue #00BFFF ΔE 0.052
Use #66C8FD 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.