#66BBD9
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(75% 0.093 223.3), rgb(102, 187, 217).
Aa
Black text reads best on this color (9.67:1).
About this color
#66BBD9 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 75%, its chroma 0.093 and its hue 223°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.043 away. Black text reads best on it, at 9.67:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.67:1 |
| White text | 2.17:1 |
Values
| HEX | #66BBD9 |
| RGB | rgb(102, 187, 217) |
| HSL | hsl(196, 60%, 63%) |
| OKLCH | oklch(75% 0.093 223.3) |
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 #66BBD9 | 2.17:1 | Fails | Lc -47.2 | Large or bold text, headings |
| Black text on #66BBD9 | 9.67:1 | AAA | Lc 61.5 | Content text, not long reading |
| #66BBD9 text on white | 2.17:1 | Fails | Lc 42.5 | Non-text elements, placeholder text |
| #66BBD9 text on black | 9.67:1 | AAA | Lc -59.7 | 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
#DFEDF2
oklch(93.7% 0.016 221.1)
-
Step 200
200
#C3DEE9
oklch(88.4% 0.032 224.3)
-
Step 300
300
#98C9DC
oklch(80.8% 0.058 223.8)
-
Step 400
400 (this color)
#66BBD9
oklch(75% 0.093 223.3)
-
Step 500
500
#0098BD
oklch(63.1% 0.118 223.1)
-
Step 600
600
#0080A0
oklch(55.7% 0.104 223.4)
-
Step 700
700
#006B87
oklch(49% 0.092 224)
-
Step 800
800
#00586F
oklch(42.7% 0.08 223.4)
-
Step 900
900
#00495D
oklch(37.7% 0.071 223.8)
-
Step 950
950
#022B38
oklch(26.9% 0.049 224.5)
#66BBD9 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) | #AAB7DB | 0.075 |
| Deuteranopia (no green cones) | #99AAD9 | 0.067 |
| Tritanopia (no blue cones) | #0FC4C4 | 0.063 |
| Achromatopsia (no color) | #B0B0B0 | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66BBD9
#66BBD9
oklch(75% 0.093 223.3)
- #E09B7E
#E09B7E
oklch(75% 0.093 43.6)
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 #66BBD9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.043
- Lightblue #7BC8F6 ΔE 0.055
- Light Cornflower Blue #98C1D9 ΔE 0.056
- Light Grey Blue #9DBCD4 ΔE 0.058
- Deep Sky Blue #00BFFF ΔE 0.063
- Bright Sky Blue #02CCFE ΔE 0.065
- Turquoise Blue #06B1C4 ΔE 0.066
- Sky Blue #87CEEB ΔE 0.066
Use #66BBD9 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.