#66B3CA
Closest named color: Turquoise Blue (#06B1C4). oklch(72.6% 0.083 219.3), rgb(102, 179, 202).
Aa
Black text reads best on this color (8.86:1).
About this color
#66B3CA is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 73%, its chroma 0.083 and its hue 219°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.050 away. Black text reads best on it, at 8.86:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 8.86:1 |
| White text | 2.36:1 |
Values
| HEX | #66B3CA |
| RGB | rgb(102, 179, 202) |
| HSL | hsl(194, 49%, 60%) |
| OKLCH | oklch(72.6% 0.083 219.3) |
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 #66B3CA | 2.36:1 | Fails | Lc -51.5 | Large or bold text, headings |
| Black text on #66B3CA | 8.86:1 | AAA | Lc 57.4 | Large or bold text, headings |
| #66B3CA text on white | 2.36:1 | Fails | Lc 46.5 | Large or bold text, headings |
| #66B3CA text on black | 8.86:1 | AAA | Lc -55.5 | 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
#C5DEE6
oklch(88.5% 0.029 219)
-
Step 300
300
#9CC9D8
oklch(80.9% 0.052 220.3)
-
Step 400
400 (this color)
#66B3CA
oklch(72.6% 0.083 219.3)
-
Step 500
500
#2398B5
oklch(63.1% 0.106 219.3)
-
Step 600
600
#00809B
oklch(55.5% 0.101 219.5)
-
Step 700
700
#006C83
oklch(49.1% 0.089 219.3)
-
Step 800
800
#00586C
oklch(42.6% 0.078 220.2)
-
Step 900
900
#004A5A
oklch(37.8% 0.068 218.5)
-
Step 950
950
#062B35
oklch(26.9% 0.044 220.1)
#66B3CA 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) | #A4AFCB | 0.070 |
| Deuteranopia (no green cones) | #95A3CA | 0.064 |
| Tritanopia (no blue cones) | #2DBBBA | 0.053 |
| Achromatopsia (no color) | #A8A8A8 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66B3CA
#66B3CA
oklch(72.6% 0.083 219.3)
- #D4957F
#D4957F
oklch(72.6% 0.083 40.1)
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 #66B3CA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.050
- Greyblue #77A1B5 ΔE 0.051
- Bluegrey #85A3B2 ΔE 0.052
- Cool Steel #97A7B3 ΔE 0.061
- Bluey Grey #89A0B0 ΔE 0.061
- Vivid Sky Blue #4CC9F0 ΔE 0.069
- Light Sea Green #20B2AA ΔE 0.069
- Light Grey Blue #9DBCD4 ΔE 0.069
Use #66B3CA 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.