#66BBCC
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(74.5% 0.086 212.1), rgb(102, 187, 204).
Aa
Black text reads best on this color (9.54:1).
About this color
#66BBCC is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 74%, its chroma 0.086 and its hue 212°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.055 away. Black text reads best on it, at 9.54:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.54:1 |
| White text | 2.20:1 |
Values
| HEX | #66BBCC |
| RGB | rgb(102, 187, 204) |
| HSL | hsl(190, 50%, 60%) |
| OKLCH | oklch(74.5% 0.086 212.1) |
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 #66BBCC | 2.20:1 | Fails | Lc -47.9 | Large or bold text, headings |
| Black text on #66BBCC | 9.54:1 | AAA | Lc 60.8 | Content text, not long reading |
| #66BBCC text on white | 2.20:1 | Fails | Lc 43.1 | Non-text elements, placeholder text |
| #66BBCC text on black | 9.54:1 | AAA | Lc -59.0 | 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
#C4DFE5
oklch(88.6% 0.03 212.6)
-
Step 300
300
#99CAD5
oklch(80.8% 0.053 213)
-
Step 400
400 (this color)
#66BBCC
oklch(74.5% 0.086 212.1)
-
Step 500
500
#039AB0
oklch(63% 0.11 212.4)
-
Step 600
600
#008294
oklch(55.7% 0.097 211.6)
-
Step 700
700
#006D7D
oklch(49.1% 0.086 212.3)
-
Step 800
800
#005967
oklch(42.6% 0.075 213)
-
Step 900
900
#004A56
oklch(37.6% 0.066 213)
-
Step 950
950
#022C33
oklch(27% 0.045 211.6)
#66BBCC 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) | #ADB6CD | 0.079 |
| Deuteranopia (no green cones) | #9DAACC | 0.072 |
| Tritanopia (no blue cones) | #27C2C0 | 0.048 |
| Achromatopsia (no color) | #AFAFAF | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66BBCC
#66BBCC
oklch(74.5% 0.086 212.1)
- #DD988A
#DD988A
oklch(74.4% 0.086 31.9)
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 #66BBCC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.055
- Turquoise Blue #06B1C4 ΔE 0.060
- Light Cornflower Blue #98C1D9 ΔE 0.060
- Dark Turquoise #00CED1 ΔE 0.060
- Light Grey Blue #9DBCD4 ΔE 0.061
- Medium Turquoise #48D1CC ΔE 0.063
- Topaz #13BBAF ΔE 0.066
- Bluegrey #85A3B2 ΔE 0.068
Use #66BBCC 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.