#66BCDA
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(75.3% 0.094 223), rgb(102, 188, 218).
Aa
Black text reads best on this color (9.77:1).
About this color
#66BCDA is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 75%, its chroma 0.094 and its hue 223°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.041 away. Black text reads best on it, at 9.77:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.77:1 |
| White text | 2.14:1 |
Values
| HEX | #66BCDA |
| RGB | rgb(102, 188, 218) |
| HSL | hsl(196, 61%, 63%) |
| OKLCH | oklch(75.3% 0.094 223) |
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 #66BCDA | 2.14:1 | Fails | Lc -46.7 | Large or bold text, headings |
| Black text on #66BCDA | 9.77:1 | AAA | Lc 61.9 | Content text, not long reading |
| #66BCDA text on white | 2.14:1 | Fails | Lc 42.0 | Non-text elements, placeholder text |
| #66BCDA text on black | 9.77:1 | AAA | Lc -60.2 | 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 400.
-
Step 50
50
#F0F7F9
oklch(97.1% 0.008 216.6)
-
Step 100
100
#DEEDF2
oklch(93.6% 0.017 219.7)
-
Step 200
200
#C3DEE9
oklch(88.4% 0.032 224.3)
-
Step 300
300
#98CADC
oklch(81% 0.058 222.1)
-
Step 400
400 (this color)
#66BCDA
oklch(75.3% 0.094 223)
-
Step 500
500
#0098BD
oklch(63.1% 0.118 223.1)
-
Step 600
600
#00809F
oklch(55.6% 0.103 222.6)
-
Step 700
700
#006B86
oklch(49% 0.091 223.1)
-
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
#012B38
oklch(26.9% 0.05 224.1)
#66BCDA 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) | #ABB8DC | 0.076 |
| Deuteranopia (no green cones) | #9AABDA | 0.068 |
| Tritanopia (no blue cones) | #09C5C5 | 0.063 |
| Achromatopsia (no color) | #B1B1B1 | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66BCDA
#66BCDA
oklch(75.3% 0.094 223)
- #E19B7F
#E19B7F
oklch(75.1% 0.093 42.6)
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 #66BCDA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.041
- Lightblue #7BC8F6 ΔE 0.053
- Light Cornflower Blue #98C1D9 ΔE 0.055
- Light Grey Blue #9DBCD4 ΔE 0.057
- Deep Sky Blue #00BFFF ΔE 0.063
- Bright Sky Blue #02CCFE ΔE 0.063
- Sky Blue #87CEEB ΔE 0.063
- Sky #82CAFC ΔE 0.065
Use #66BCDA 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.