I received an answer from Chuck Shavit at CloudAhoy regarding international availability:

"The CloudAhoy app is currently only available in the*US*app store. The debriefing relies heavily on access to aviation and*weather*information which is country-specific, and currently CloudAhoy receives such data only from the*FAA, i.e., only in the*US.

I have general plans to support CloudAhoy in Europe and Canada, but do not have dates yet.
"