#66BCD2
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(75% 0.089 216.4), rgb(102, 188, 210).
Aa
Black text reads best on this color (9.68:1).
About this color
#66BCD2 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 75%, its chroma 0.089 and its hue 216°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.048 away. Black text reads best on it, at 9.68:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.68:1 |
| White text | 2.16:1 |
Values
| HEX | #66BCD2 |
| RGB | rgb(102, 188, 210) |
| HSL | hsl(192, 55%, 61%) |
| OKLCH | oklch(75% 0.089 216.4) |
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 #66BCD2 | 2.16:1 | Fails | Lc -47.1 | Large or bold text, headings |
| Black text on #66BCD2 | 9.68:1 | AAA | Lc 61.5 | Content text, not long reading |
| #66BCD2 text on white | 2.16:1 | Fails | Lc 42.4 | Non-text elements, placeholder text |
| #66BCD2 text on black | 9.68:1 | AAA | Lc -59.8 | Large or bold text, headings |
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 400.
-
Step 50
50
#F0F7F9
oklch(97.1% 0.008 216.6)
-
Step 100
100
#DFEDF1
oklch(93.7% 0.016 216.7)
-
Step 200
200
#C3DFE6
oklch(88.5% 0.031 214.5)
-
Step 300
300
#98CAD8
oklch(80.9% 0.056 216.9)
-
Step 400
400 (this color)
#66BCD2
oklch(75% 0.089 216.4)
-
Step 500
500
#009AB5
oklch(63.2% 0.112 216)
-
Step 600
600
#008198
oklch(55.6% 0.099 216.1)
-
Step 700
700
#006C80
oklch(49% 0.087 216.4)
-
Step 800
800
#00596A
oklch(42.8% 0.076 216.6)
-
Step 900
900
#004A58
oklch(37.7% 0.067 215.8)
-
Step 950
950
#022C35
oklch(27.1% 0.046 216)
#66BCD2 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) | #ADB7D3 | 0.079 |
| Deuteranopia (no green cones) | #9CABD2 | 0.070 |
| Tritanopia (no blue cones) | #1EC4C3 | 0.053 |
| Achromatopsia (no color) | #B0B0B0 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66BCD2
#66BCD2
oklch(75% 0.089 216.4)
- #E09A86
#E09A86
oklch(75% 0.089 36.6)
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 #66BCD2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.048
- Light Cornflower Blue #98C1D9 ΔE 0.056
- Light Grey Blue #9DBCD4 ΔE 0.058
- Dark Turquoise #00CED1 ΔE 0.061
- Lightblue #7BC8F6 ΔE 0.061
- Turquoise Blue #06B1C4 ΔE 0.063
- Medium Turquoise #48D1CC ΔE 0.064
- Sky Blue #87CEEB ΔE 0.067
Use #66BCD2 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.