Online is not how you choose anything where color is a big deal. Go to a store that carries Mapei and get a sample . Here we would need to see where you are using it and why that particular color. and we still cannot help you make that decision online.

No tile distributor is carrying any of the new colors. Their color pallet did NOT need that silly revision with all the blue colors added.

Frost is still the standard for that pale gray white color choice.

Lomo is frost darker than Custom grout color ash? I’m looking for a gray that’s a bit lighter than frost. My local stores don’t carry ash so I would have to order it.

Frost is THE go to with any white marble look choice. It just disappears. Moonbeam is too light. It stands out.

Anyone else using it would need to the exact space you want to use it . Seeing stuff in someone else space is just as useless as choosing this online .

If you pick wrong, there are grout colorants that you can apply to cover the wrong color (they are like paint).

Moonbeam is too light.

@Lomo I’m planning to use Cloe tile, not marble look tile. The moonbeam might work with the white/grayish white tiles.

@JR L - Did you end up going with the Moonbeam MAPEI grout?

I made samples using scrap tile, one with Moonbeam and one with Frost. I didn't care for the Frost at first, but once it dried it lightened up significantly. Now I'm torn!

@CEJ 859 which did you end up using? they both look nice. The moonbeam seems a bit warmer.

Which grout did you go with? I’m deciding between these 2 colors for honed Cararra Marble.

@askitek I used both in a recent renovation. I used the Frost with some faux-marble 12x24 tiles, and the Moonbeam with some slightly grayish white penny tile. They both look great! Unless the background of your marble is white, if it is more a gray tone, and you want it to blend in, I think you'll be safe with Frost.

This is my marble. It’s Riad Honed Casablanca. Doing 6x12 in shower and 5” hex on floors.

I don’t know why the photo appears 4x. lol The top grout is the Mapei Moonbeam sample and bottom is Frost. Grout line will be 1/8”

This image shows the hex on the right. Top: eggshell, middle Moonbeam, bottom Frost.

@askitek, you definitely don't want eggshell here, it will look yellow-ish in contrast to the gray (I have it on my backsplash). I am attaching photos -- the marble tiles have frost and the white penny tiles have moonbeam, the other is eggshell. I think you could use frost or moonbeam, it's a matter of taste. The moonbeam might match your background a little better, it might be just a wee bit lighter, and the frost would match the graining. For me, the moonbeam was too white-ish next to my marble tiles.

Really appreciate the photos. I’m still torn. I may buy a bag of each and do a sample.

good idea. I can't remember if I wrote this below, but I would not use Moonbeam on the floor, regardless of what you use on the walls - light grout shows dirt after a while....so if you want contrast, you can use frost on the floor and moonbeam on the walls, or if you want it to all blend i would use frost on both.

Well that pretty much makes my decision then. I prefer all the grout to match and I’ll have 5” hex tile on the bathroom and shower pan floor so sounds like Frost is the way to go. I’ve heard Mapei grout is better at concealing dirt but still… did you use the 511 sealer before and after grout on your tile?

no we did not use any sealer .....but I did not use tile in a shower floor where it would get wet