#66BDCC
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(75% 0.086 210), rgb(102, 189, 204).
Aa
Black text reads best on this color (9.71:1).
About this color
#66BDCC is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 75%, its chroma 0.086 and its hue 210°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.053 away. Black text reads best on it, at 9.71:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.71:1 |
| White text | 2.16:1 |
Values
| HEX | #66BDCC |
| RGB | rgb(102, 189, 204) |
| HSL | hsl(189, 50%, 60%) |
| OKLCH | oklch(75% 0.086 210) |
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 #66BDCC | 2.16:1 | Fails | Lc -47.0 | Large or bold text, headings |
| Black text on #66BDCC | 9.71:1 | AAA | Lc 61.6 | Content text, not long reading |
| #66BDCC text on white | 2.16:1 | Fails | Lc 42.3 | Non-text elements, placeholder text |
| #66BDCC text on black | 9.71:1 | AAA | Lc -59.9 | 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
#F0F7F8
oklch(97.1% 0.008 207.1)
-
Step 100
100
#DFEDF0
oklch(93.7% 0.015 212)
-
Step 200
200
#C3DFE4
oklch(88.5% 0.03 209.6)
-
Step 300
300
#98CBD4
oklch(80.9% 0.054 209.6)
-
Step 400
400 (this color)
#66BDCC
oklch(75% 0.086 210)
-
Step 500
500
#009BAE
oklch(63.2% 0.109 210)
-
Step 600
600
#008292
oklch(55.6% 0.096 209.8)
-
Step 700
700
#006D7B
oklch(49% 0.085 210.2)
-
Step 800
800
#005A65
oklch(42.8% 0.074 209.1)
-
Step 900
900
#004B55
oklch(37.8% 0.065 210)
-
Step 950
950
#012C33
oklch(26.9% 0.046 211.3)
#66BDCC 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) | #B0B7CD | 0.083 |
| Deuteranopia (no green cones) | #A0ABCC | 0.076 |
| Tritanopia (no blue cones) | #26C4C1 | 0.046 |
| Achromatopsia (no color) | #B0B0B0 | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66BDCC
#66BDCC
oklch(75% 0.086 210)
- #DF998D
#DF998D
oklch(74.9% 0.087 30)
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 #66BDCC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.053
- Dark Turquoise #00CED1 ΔE 0.056
- Medium Turquoise #48D1CC ΔE 0.057
- Light Cornflower Blue #98C1D9 ΔE 0.058
- Light Grey Blue #9DBCD4 ΔE 0.060
- Turquoise Blue #06B1C4 ΔE 0.063
- Topaz #13BBAF ΔE 0.065
- Lightblue #7BC8F6 ΔE 0.067
Use #66BDCC 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.