#66DBE2
Closest named color: Aqua Blue (#02D8E9). oklch(82.7% 0.106 200.6), rgb(102, 219, 226).
Aa
Black text reads best on this color (12.79:1).
About this color
#66DBE2 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 83%, its chroma 0.106 and its hue 201°. Its hue sits on the cool side of the wheel. The nearest named color is Aqua Blue (#02D8E9), ΔE 0.039 away. Black text reads best on it, at 12.79:1.
| Hue family | Teals and cyans |
| Lightness | light (83%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Aqua Blue (#02D8E9) |
| Black text | 12.79:1 |
| White text | 1.64:1 |
Values
| HEX | #66DBE2 |
| RGB | rgb(102, 219, 226) |
| HSL | hsl(183, 68%, 64%) |
| OKLCH | oklch(82.7% 0.106 200.6) |
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 #66DBE2 | 1.64:1 | Fails | Lc -31.8 | Non-text elements, placeholder text |
| Black text on #66DBE2 | 12.79:1 | AAA | Lc 75.6 | Fine for body text |
| #66DBE2 text on white | 1.64:1 | Fails | Lc 28.2 | Dividers and decoration only |
| #66DBE2 text on black | 12.79:1 | AAA | Lc -74.7 | 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
#EBF9F9
oklch(97.2% 0.015 196.9)
-
Step 100
100
#D3F0F2
oklch(93.5% 0.03 201.7)
-
Step 200
200
#ACE5E9
oklch(88.4% 0.058 201.6)
-
Step 300
300 (this color)
#66DBE2
oklch(82.7% 0.106 200.6)
-
Step 400
400
#00B6BF
oklch(70.6% 0.12 201.1)
-
Step 500
500
#009CA4
oklch(63% 0.107 201.2)
-
Step 600
600
#00838A
oklch(55.5% 0.094 201.4)
-
Step 700
700
#006E74
oklch(49% 0.083 201.4)
-
Step 800
800
#005B5F
oklch(42.8% 0.073 200)
-
Step 900
900
#004B4F
oklch(37.5% 0.064 200.9)
-
Step 950
950
#002D2F
oklch(27% 0.046 199.4)
#66DBE2 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) | #CDD2E3 | 0.108 |
| Deuteranopia (no green cones) | #B9C4E3 | 0.099 |
| Tritanopia (no blue cones) | #00E2DD | 0.040 |
| Achromatopsia (no color) | #CACACA | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66DBE2
#66DBE2
oklch(82.7% 0.106 200.6)
- #FFADAC
#FFADAC
oklch(82.6% 0.097 20.1)
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 #66DBE2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Aqua Blue #02D8E9 ΔE 0.039
- Turquoise #40E0D0 ΔE 0.041
- Medium Turquoise #48D1CC ΔE 0.045
- Sky Blue #87CEEB ΔE 0.048
- Robin's Egg #6DEDFD ΔE 0.055
- Tiffany Blue #94D2BD ΔE 0.057
- Seafoam Blue #78D1B6 ΔE 0.059
- Celeste #A8DADC ΔE 0.061
Use #66DBE2 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.