#66DEFD
Closest named color: Robin's Egg (#6DEDFD). oklch(84.4% 0.115 217.4), rgb(102, 222, 253).
Aa
Black text reads best on this color (13.43:1).
About this color
#66DEFD is a light, moderately saturated teal or cyan. In OKLCH its lightness is 84%, its chroma 0.115 and its hue 217°. Its hue sits on the cool side of the wheel. The nearest named color is Robin's Egg (#6DEDFD), ΔE 0.042 away. Black text reads best on it, at 13.43:1.
| Hue family | Teals and cyans |
| Lightness | light (84%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Robin's Egg (#6DEDFD) |
| Black text | 13.43:1 |
| White text | 1.56:1 |
Values
| HEX | #66DEFD |
| RGB | rgb(102, 222, 253) |
| HSL | hsl(192, 97%, 70%) |
| OKLCH | oklch(84.4% 0.115 217.4) |
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 #66DEFD | 1.56:1 | Fails | Lc -28.9 | Dividers and decoration only |
| Black text on #66DEFD | 13.43:1 | AAA | Lc 78.3 | Fine for body text |
| #66DEFD text on white | 1.56:1 | Fails | Lc 25.5 | Dividers and decoration only |
| #66DEFD text on black | 13.43:1 | AAA | Lc -77.6 | 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
#EBF8FC
oklch(97.1% 0.015 218)
-
Step 100
100
#D2F0F9
oklch(93.6% 0.034 217.7)
-
Step 200
200
#A9E4F5
oklch(88.4% 0.064 217.5)
-
Step 300
300 (this color)
#66DEFD
oklch(84.4% 0.115 217.4)
-
Step 400
400
#00B3D4
oklch(70.7% 0.127 217.3)
-
Step 500
500
#0099B6
oklch(63% 0.113 217.6)
-
Step 600
600
#008199
oklch(55.6% 0.099 216.9)
-
Step 700
700
#006C81
oklch(49% 0.088 217.4)
-
Step 800
800
#00596A
oklch(42.8% 0.076 216.6)
-
Step 900
900
#004A59
oklch(37.7% 0.067 217.2)
-
Step 950
950
#002C36
oklch(27% 0.048 217.4)
#66DEFD 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) | #CAD8FF | 0.101 |
| Deuteranopia (no green cones) | #B3C8FD | 0.089 |
| Tritanopia (no blue cones) | #00E9E8 | 0.060 |
| Achromatopsia (no color) | #CFCFCF | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66DEFD
#66DEFD
oklch(84.4% 0.115 217.4)
- #FFB8A3
#FFB8A3
oklch(84.4% 0.088 37.1)
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 #66DEFD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Robin's Egg #6DEDFD ΔE 0.042
- Sky Blue #87CEEB ΔE 0.046
- Light Sky Blue #87CEFA ΔE 0.047
- Aqua Blue #02D8E9 ΔE 0.052
- Sky #82CAFC ΔE 0.056
- Lightblue #7BC8F6 ΔE 0.058
- Vivid Sky Blue #4CC9F0 ΔE 0.062
- Robin Egg Blue #8AF1FE ΔE 0.063
Use #66DEFD 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.