The only way to know whether or not the color will read blue or gray on your home is to get a large enough sample, and put it on the side of the house leaning against the house and view it at all different times of day.

For example, there was a color I loved and used in my house in NY. It read tan in my house. I decided when renovating my condo in FL, I was going to use the same color since I loved it so much. However in FL, the color didn't read tan but more of a yucky reddish/beige color. Why? Because the light in FL trends towards the warmer spectrum.

Lots of it in SoCal. It does have a blue cast. Looks great with a red front door.

Mine is Light Mist. I think it's a pretty true gray. I don't have any recent pics handy, but here are a couple during the construction phase.

You can always paint it any color you want.