#66DAEF
Closest named color: Sky Blue (#87CEEB). oklch(82.9% 0.108 211.1), rgb(102, 218, 239).
Aa
Black text reads best on this color (12.83:1).
About this color
#66DAEF is a light, moderately saturated teal or cyan. In OKLCH its lightness is 83%, its chroma 0.108 and its hue 211°. Its hue sits on the cool side of the wheel. The nearest named color is Sky Blue (#87CEEB), ΔE 0.038 away. Black text reads best on it, at 12.83:1.
| Hue family | Teals and cyans |
| Lightness | light (83%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Sky Blue (#87CEEB) |
| Black text | 12.83:1 |
| White text | 1.63:1 |
Values
| HEX | #66DAEF |
| RGB | rgb(102, 218, 239) |
| HSL | hsl(189, 81%, 67%) |
| OKLCH | oklch(82.9% 0.108 211.1) |
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 #66DAEF | 1.63:1 | Fails | Lc -31.6 | Non-text elements, placeholder text |
| Black text on #66DAEF | 12.83:1 | AAA | Lc 75.8 | Fine for body text |
| #66DAEF text on white | 1.63:1 | Fails | Lc 28.0 | Dividers and decoration only |
| #66DAEF text on black | 12.83:1 | AAA | Lc -74.9 | 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
#EBF8FB
oklch(97% 0.014 213.1)
-
Step 100
100
#D3F0F6
oklch(93.6% 0.031 211.5)
-
Step 200
200
#ABE5F0
oklch(88.6% 0.061 210.5)
-
Step 300
300 (this color)
#66DAEF
oklch(82.9% 0.108 211.1)
-
Step 400
400
#00B4CC
oklch(70.6% 0.123 211.4)
-
Step 500
500
#009BAF
oklch(63.2% 0.11 210.8)
-
Step 600
600
#008293
oklch(55.6% 0.096 210.7)
-
Step 700
700
#006D7C
oklch(49% 0.085 211.2)
-
Step 800
800
#005966
oklch(42.6% 0.074 211.8)
-
Step 900
900
#004B55
oklch(37.8% 0.065 210)
-
Step 950
950
#002C33
oklch(26.9% 0.047 211.1)
#66DAEF 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) | #C9D3F0 | 0.102 |
| Deuteranopia (no green cones) | #B4C4EF | 0.092 |
| Tritanopia (no blue cones) | #00E3E0 | 0.051 |
| Achromatopsia (no color) | #CACACA | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66DAEF
#66DAEF
oklch(82.9% 0.108 211.1)
- #FFB0A1
#FFB0A1
oklch(82.9% 0.096 31.1)
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 #66DAEF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sky Blue #87CEEB ΔE 0.038
- Aqua Blue #02D8E9 ΔE 0.040
- Light Sky Blue #87CEFA ΔE 0.048
- Robin's Egg #6DEDFD ΔE 0.052
- Vivid Sky Blue #4CC9F0 ΔE 0.054
- Lightblue #7BC8F6 ΔE 0.054
- Sky #82CAFC ΔE 0.056
- Medium Turquoise #48D1CC ΔE 0.058
Use #66DAEF 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.