#66B4CD
Closest named color: Turquoise Blue (#06B1C4). oklch(72.9% 0.085 220.9), rgb(102, 180, 205).
Aa
Black text reads best on this color (8.97:1).
About this color
#66B4CD is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 73%, its chroma 0.085 and its hue 221°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.052 away. Black text reads best on it, at 8.97:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.085) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 8.97:1 |
| White text | 2.33:1 |
Values
| HEX | #66B4CD |
| RGB | rgb(102, 180, 205) |
| HSL | hsl(195, 51%, 60%) |
| OKLCH | oklch(72.9% 0.085 220.9) |
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 #66B4CD | 2.33:1 | Fails | Lc -50.9 | Large or bold text, headings |
| Black text on #66B4CD | 8.97:1 | AAA | Lc 58.0 | Large or bold text, headings |
| #66B4CD text on white | 2.33:1 | Fails | Lc 46.0 | Large or bold text, headings |
| #66B4CD text on black | 8.97:1 | AAA | Lc -56.1 | 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
#F1F7F9
oklch(97.2% 0.007 219.6)
-
Step 100
100
#DFECF1
oklch(93.5% 0.015 222.7)
-
Step 200
200
#C5DEE7
oklch(88.5% 0.029 221.4)
-
Step 300
300
#9BC9D9
oklch(80.9% 0.053 221.2)
-
Step 400
400 (this color)
#66B4CD
oklch(72.9% 0.085 220.9)
-
Step 500
500
#1F98B7
oklch(63.1% 0.108 220.5)
-
Step 600
600
#00809D
oklch(55.6% 0.102 221.1)
-
Step 700
700
#006C84
oklch(49.2% 0.09 220.2)
-
Step 800
800
#00586D
oklch(42.6% 0.078 221.3)
-
Step 900
900
#00495B
oklch(37.6% 0.069 221.4)
-
Step 950
950
#062B36
oklch(27% 0.045 222.2)
#66B4CD 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) | #A5B0CE | 0.071 |
| Deuteranopia (no green cones) | #95A4CD | 0.064 |
| Tritanopia (no blue cones) | #29BCBC | 0.054 |
| Achromatopsia (no color) | #A9A9A9 | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66B4CD
#66B4CD
oklch(72.9% 0.085 220.9)
- #D6967E
#D6967E
oklch(73% 0.085 41.4)
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 #66B4CD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.052
- Greyblue #77A1B5 ΔE 0.054
- Bluegrey #85A3B2 ΔE 0.056
- Cool Steel #97A7B3 ΔE 0.063
- Bluey Grey #89A0B0 ΔE 0.064
- Vivid Sky Blue #4CC9F0 ΔE 0.065
- Light Grey Blue #9DBCD4 ΔE 0.067
- Light Cornflower Blue #98C1D9 ΔE 0.069
Use #66B4CD 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.