#66D4E4
Closest named color: Sky Blue (#87CEEB). oklch(81.1% 0.103 208), rgb(102, 212, 228).
Aa
Black text reads best on this color (12.10:1).
About this color
#66D4E4 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 81%, its chroma 0.103 and its hue 208°. Its hue sits on the cool side of the wheel. The nearest named color is Sky Blue (#87CEEB), ΔE 0.035 away. Black text reads best on it, at 12.10:1.
| Hue family | Teals and cyans |
| Lightness | light (81%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | Sky Blue (#87CEEB) |
| Black text | 12.10:1 |
| White text | 1.73:1 |
Values
| HEX | #66D4E4 |
| RGB | rgb(102, 212, 228) |
| HSL | hsl(188, 70%, 65%) |
| OKLCH | oklch(81.1% 0.103 208) |
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 #66D4E4 | 1.73:1 | Fails | Lc -35.1 | Non-text elements, placeholder text |
| Black text on #66D4E4 | 12.10:1 | AAA | Lc 72.6 | Content text, not long reading |
| #66D4E4 text on white | 1.73:1 | Fails | Lc 31.2 | Non-text elements, placeholder text |
| #66D4E4 text on black | 12.10:1 | AAA | Lc -71.5 | 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
#ECF8FA
oklch(97.1% 0.013 208.8)
-
Step 100
100
#D4F0F4
oklch(93.6% 0.03 207.1)
-
Step 200
200
#AEE4ED
oklch(88.5% 0.056 208.8)
-
Step 300
300 (this color)
#66D4E4
oklch(81.1% 0.103 208)
-
Step 400
400
#00B5C8
oklch(70.7% 0.122 208)
-
Step 500
500
#009BAC
oklch(63.1% 0.109 208.4)
-
Step 600
600
#008290
oklch(55.5% 0.095 208)
-
Step 700
700
#006E7A
oklch(49.2% 0.085 207.9)
-
Step 800
800
#005A64
oklch(42.8% 0.073 207.9)
-
Step 900
900
#004B53
oklch(37.7% 0.065 207)
-
Step 950
950
#002D32
oklch(27.1% 0.046 206.3)
#66D4E4 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) | #C4CDE5 | 0.099 |
| Deuteranopia (no green cones) | #B1BEE4 | 0.092 |
| Tritanopia (no blue cones) | #00DCD9 | 0.048 |
| Achromatopsia (no color) | #C4C4C4 | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66D4E4
#66D4E4
oklch(81.1% 0.103 208)
- #FDA89C
#FDA89C
oklch(81.2% 0.103 28.3)
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 #66D4E4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sky Blue #87CEEB ΔE 0.035
- Aqua Blue #02D8E9 ΔE 0.036
- Medium Turquoise #48D1CC ΔE 0.042
- Vivid Sky Blue #4CC9F0 ΔE 0.044
- Light Sky Blue #87CEFA ΔE 0.050
- Lightblue #7BC8F6 ΔE 0.051
- Dark Turquoise #00CED1 ΔE 0.054
- Turquoise #40E0D0 ΔE 0.055
Use #66D4E4 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.