Which country app is MEGA?

Could you please clarify which country you are referring to when you ask which country's app is MEGA? MEGA is a cloud storage and file sharing service that operates independently of any specific country's jurisdiction. It is owned and operated by a company based in New Zealand, but it provides services to users worldwide. As such, MEGA cannot be attributed to a single country's app. However, if you are asking about the nationality of the company behind MEGA, then the answer would be New Zealand.