To view your web library on a mobile device, you don't need to use any apps.
You will, however, need to have registered for a free Zotero.org account and synced your account to Zotero.org. See how to do this here.
Just browse to Zotero.org on your mobile device of choice and log into Zotero with your username and password. Click on "My Library" to see the items you have stored in your library.
