#66C8FB
Closest named color: Lightblue (#7BC8F6). oklch(79.3% 0.117 233.6), rgb(102, 200, 251).
Aa
Black text reads best on this color (11.21:1).
About this color
#66C8FB is a light, moderately saturated blue. In OKLCH its lightness is 79%, its chroma 0.117 and its hue 234°. Its hue sits on the cool side of the wheel. The nearest named color is Lightblue (#7BC8F6), ΔE 0.019 away. Black text reads best on it, at 11.21:1.
| Hue family | Blues |
| Lightness | light (79%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Lightblue (#7BC8F6) |
| Black text | 11.21:1 |
| White text | 1.87:1 |
Values
| HEX | #66C8FB |
| RGB | rgb(102, 200, 251) |
| HSL | hsl(201, 95%, 69%) |
| OKLCH | oklch(79.3% 0.117 233.6) |
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 #66C8FB | 1.87:1 | Fails | Lc -39.4 | Non-text elements, placeholder text |
| Black text on #66C8FB | 11.21:1 | AAA | Lc 68.7 | Content text, not long reading |
| #66C8FB text on white | 1.87:1 | Fails | Lc 35.2 | Non-text elements, placeholder text |
| #66C8FB text on black | 11.21:1 | AAA | Lc -67.3 | 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
#D5EEFD
oklch(93.5% 0.033 234.1)
-
Step 200
200
#AFE1FE
oklch(88.5% 0.065 233.9)
-
Step 300
300 (this color)
#66C8FB
oklch(79.3% 0.117 233.6)
-
Step 400
400
#00AEED
oklch(70.7% 0.147 233.5)
-
Step 500
500
#0095CC
oklch(63.1% 0.132 233.7)
-
Step 600
600
#007DAC
oklch(55.5% 0.116 233.8)
-
Step 700
700
#006991
oklch(49% 0.102 233.6)
-
Step 800
800
#005678
oklch(42.7% 0.089 233.9)
-
Step 900
900
#004864
oklch(37.8% 0.078 232.8)
-
Step 950
950
#002A3D
oklch(26.9% 0.056 233.8)
#66C8FB 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) | #AFC6FD | 0.075 |
| Deuteranopia (no green cones) | #9BB7FA | 0.065 |
| Tritanopia (no blue cones) | #00D6D9 | 0.082 |
| Achromatopsia (no color) | #BDBDBD | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66C8FB
#66C8FB
oklch(79.3% 0.117 233.6)
- #F6A671
#F6A671
oklch(79.2% 0.117 53.8)
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 #66C8FB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Lightblue #7BC8F6 ΔE 0.019
- Vivid Sky Blue #4CC9F0 ΔE 0.026
- Sky #82CAFC ΔE 0.026
- Light Sky Blue #87CEFA ΔE 0.036
- Bright Sky Blue #02CCFE ΔE 0.038
- Sky Blue #87CEEB ΔE 0.043
- Carolina Blue #8AB8FE ΔE 0.052
- Deep Sky Blue #00BFFF ΔE 0.053
Use #66C8FB 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.