Tor: What are my Tor options on an iPhone or iPad?

Short answer

The Tor Project does not provide an official Tor Browser for iOS. Its installation guidance recommends Onion Browser, an open-source app that routes browsing through Tor, while noting that iOS platform restrictions prevent the same protections as desktop Tor Browser. Check the current Tor Project guidance before choosing an iOS app and avoid assuming every privacy browser uses Tor.

Sources

Tor Project: Installing.