For the first 5GB of cloud storage, iCloud is free to use. From there, users will need to pay for additional storage.
Dropbox offers 2GB of free storage. Users can get 500MB of additional storage per referral link signup. From there, it will cost an additional monthly fee for more storage.
While most iCloud users are also Apple users, there is iCloud access available on Windows computers.
iCloud storage tops out at 2TB. Dropbox, on the other hand, has an unlimited plan.