#66DDFF
Closest named color: Light Sky Blue (#87CEFA). oklch(84.2% 0.116 219.5), rgb(102, 221, 255).
Aa
Black text reads best on this color (13.35:1).
About this color
#66DDFF is a light, moderately saturated teal or cyan. In OKLCH its lightness is 84%, its chroma 0.116 and its hue 219°. Its hue sits on the cool side of the wheel. The nearest named color is Light Sky Blue (#87CEFA), ΔE 0.044 away. Black text reads best on it, at 13.35:1.
| Hue family | Teals and cyans |
| Lightness | light (84%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Light Sky Blue (#87CEFA) |
| Black text | 13.35:1 |
| White text | 1.57:1 |
Values
| HEX | #66DDFF |
| RGB | rgb(102, 221, 255) |
| HSL | hsl(193, 100%, 70%) |
| OKLCH | oklch(84.2% 0.116 219.5) |
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 #66DDFF | 1.57:1 | Fails | Lc -29.2 | Dividers and decoration only |
| Black text on #66DDFF | 13.35:1 | AAA | Lc 77.9 | Fine for body text |
| #66DDFF text on white | 1.57:1 | Fails | Lc 25.9 | Dividers and decoration only |
| #66DDFF text on black | 13.35:1 | AAA | Lc -77.2 | Fine for body text |
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
#EBF8FD
oklch(97.1% 0.015 222.7)
-
Step 100
100
#D2F0F9
oklch(93.6% 0.034 217.7)
-
Step 200
200
#A9E4F7
oklch(88.5% 0.065 219.7)
-
Step 300
300 (this color)
#66DDFF
oklch(84.2% 0.116 219.5)
-
Step 400
400
#00B2D7
oklch(70.6% 0.128 219.8)
-
Step 500
500
#0099B9
oklch(63.1% 0.115 219.7)
-
Step 600
600
#00809C
oklch(55.5% 0.101 220.3)
-
Step 700
700
#006C83
oklch(49.1% 0.089 219.3)
-
Step 800
800
#00586C
oklch(42.6% 0.078 220.2)
-
Step 900
900
#004A5A
oklch(37.8% 0.068 218.5)
-
Step 950
950
#002C37
oklch(27.1% 0.049 219.4)
#66DDFF 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) | #C8D7FF | 0.098 |
| Deuteranopia (no green cones) | #B2C7FF | 0.089 |
| Tritanopia (no blue cones) | #00E8E8 | 0.062 |
| Achromatopsia (no color) | #CECECE | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66DDFF
#66DDFF
oklch(84.2% 0.116 219.5)
- #FFB89F
#FFB89F
oklch(84.3% 0.09 40.2)
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 #66DDFF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Sky Blue #87CEFA ΔE 0.044
- Sky Blue #87CEEB ΔE 0.045
- Robin's Egg #6DEDFD ΔE 0.046
- Sky #82CAFC ΔE 0.052
- Aqua Blue #02D8E9 ΔE 0.053
- Lightblue #7BC8F6 ΔE 0.055
- Vivid Sky Blue #4CC9F0 ΔE 0.060
- Baby Blue #A2CFFE ΔE 0.062
Use #66DDFF 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.