#66CBFA
Closest named color: Lightblue (#7BC8F6). oklch(80% 0.115 230.7), rgb(102, 203, 250).
Aa
Black text reads best on this color (11.48:1).
About this color
#66CBFA is a light, moderately saturated blue. In OKLCH its lightness is 80%, its chroma 0.115 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Lightblue (#7BC8F6), ΔE 0.018 away. Black text reads best on it, at 11.48:1.
| Hue family | Blues |
| Lightness | light (80%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Lightblue (#7BC8F6) |
| Black text | 11.48:1 |
| White text | 1.82:1 |
Values
| HEX | #66CBFA |
| RGB | rgb(102, 203, 250) |
| HSL | hsl(199, 94%, 69%) |
| OKLCH | oklch(80% 0.115 230.7) |
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 #66CBFA | 1.82:1 | Fails | Lc -38.1 | Non-text elements, placeholder text |
| Black text on #66CBFA | 11.48:1 | AAA | Lc 69.9 | Content text, not long reading |
| #66CBFA text on white | 1.82:1 | Fails | Lc 34.0 | Non-text elements, placeholder text |
| #66CBFA text on black | 11.48:1 | AAA | Lc -68.6 | 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
#ECF8FE
oklch(97.2% 0.015 229)
-
Step 100
100
#D4EFFC
oklch(93.6% 0.033 228.3)
-
Step 200
200
#AEE2FC
oklch(88.5% 0.064 230)
-
Step 300
300 (this color)
#66CBFA
oklch(80% 0.115 230.7)
-
Step 400
400
#00AFE8
oklch(70.7% 0.142 230.7)
-
Step 500
500
#0096C7
oklch(63.1% 0.126 230.5)
-
Step 600
600
#007EA8
oklch(55.6% 0.112 230.6)
-
Step 700
700
#006A8E
oklch(49.1% 0.099 230.6)
-
Step 800
800
#005775
oklch(42.8% 0.086 230.3)
-
Step 900
900
#004862
oklch(37.7% 0.076 230.8)
-
Step 950
950
#002B3C
oklch(27.1% 0.054 230.4)
#66CBFA 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) | #B3C8FC | 0.079 |
| Deuteranopia (no green cones) | #9FB9F9 | 0.069 |
| Tritanopia (no blue cones) | #00D8DA | 0.078 |
| Achromatopsia (no color) | #C0C0C0 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66CBFA
#66CBFA
oklch(80% 0.115 230.7)
- #F9A878
#F9A878
oklch(80% 0.115 51.1)
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 #66CBFA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Lightblue #7BC8F6 ΔE 0.018
- Sky #82CAFC ΔE 0.025
- Vivid Sky Blue #4CC9F0 ΔE 0.025
- Light Sky Blue #87CEFA ΔE 0.032
- Sky Blue #87CEEB ΔE 0.038
- Bright Sky Blue #02CCFE ΔE 0.038
- Deep Sky Blue #00BFFF ΔE 0.058
- Carolina Blue #8AB8FE ΔE 0.059
Use #66CBFA 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.