Once you create a Sortly account (free or premium), you can share the account details with others (family, friends or co-workers). When they login using the same account credentials in their device, they can get all the data present in the account. The devices will also remain automatically synced with changes from one device reflected on the other.
At the moment, we don't have any restrictions on number of devices connected to the account.
NOTE: If you are planning on sharing the account, we recommend creating the account with email and password (as opposed to Facebook or Evernote). In that way, the other user does not need your Facebook or Evernote password in order to login to Sortly.