We recommend iOS app Onion Browser which relies on Orbot for a secure connection to Tor.
Onion Browser and Orbot are open source, use Tor routing, and are developed by someone who works closely with the Tor Project.
However, Apple requires browsers on iOS to use something called Webkit, which prevents Onion Browser from having the same privacy protections as Tor Browser.
Learn more about Onion Browser.
Download Onion Browser and Orbot from the App Store.