Does this app provide offline storage or cloud storage? I don't want to guess but it was not very evident on your product page. The thing I really like about A

Does this app provide offline storage or cloud storage? I don't want to guess but it was not very evident on your product page. The thing I really like about Anki is I can create a separate profile to store cards related to say private confidential knowledge at workplace and I won't sync that profile so those cards stay just there encrypted on my office laptop. Hence offline storage is critical.