#66BFDA
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(75.9% 0.094 220), rgb(102, 191, 218).
Aa
Black text reads best on this color (10.02:1).
About this color
#66BFDA is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 76%, its chroma 0.094 and its hue 220°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.036 away. Black text reads best on it, at 10.02:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 10.02:1 |
| White text | 2.09:1 |
Values
| HEX | #66BFDA |
| RGB | rgb(102, 191, 218) |
| HSL | hsl(194, 61%, 63%) |
| OKLCH | oklch(75.9% 0.094 220) |
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 #66BFDA | 2.09:1 | Fails | Lc -45.4 | Large or bold text, headings |
| Black text on #66BFDA | 10.02:1 | AAA | Lc 63.2 | Content text, not long reading |
| #66BFDA text on white | 2.09:1 | Fails | Lc 40.8 | Non-text elements, placeholder text |
| #66BFDA text on black | 10.02:1 | AAA | Lc -61.5 | 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
#EDF8FB
oklch(97.2% 0.012 215.8)
-
Step 100
100
#D7EFF7
oklch(93.7% 0.028 219.8)
-
Step 200
200
#B4E2F1
oklch(88.5% 0.052 219.7)
-
Step 300
300 (this color)
#66BFDA
oklch(75.9% 0.094 220)
-
Step 400
400
#00B2D8
oklch(70.7% 0.129 220.4)
-
Step 500
500
#0099B9
oklch(63.1% 0.115 219.7)
-
Step 600
600
#00809C
oklch(55.5% 0.101 220.3)
-
Step 700
700
#006C84
oklch(49.2% 0.09 220.2)
-
Step 800
800
#00586C
oklch(42.6% 0.078 220.2)
-
Step 900
900
#004A5B
oklch(37.8% 0.069 219.8)
-
Step 950
950
#002C37
oklch(27.1% 0.049 219.4)
#66BFDA 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) | #AEBBDB | 0.078 |
| Deuteranopia (no green cones) | #9DAEDA | 0.070 |
| Tritanopia (no blue cones) | #05C8C7 | 0.060 |
| Achromatopsia (no color) | #B3B3B3 | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66BFDA
#66BFDA
oklch(75.9% 0.094 220)
- #E59D84
#E59D84
oklch(76% 0.094 39.9)
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 #66BFDA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.036
- Lightblue #7BC8F6 ΔE 0.049
- Light Cornflower Blue #98C1D9 ΔE 0.052
- Light Grey Blue #9DBCD4 ΔE 0.056
- Sky Blue #87CEEB ΔE 0.057
- Bright Sky Blue #02CCFE ΔE 0.060
- Dark Turquoise #00CED1 ΔE 0.060
- Sky #82CAFC ΔE 0.062
Use #66BFDA 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.