Transdroid is not available for iPhone but there are a few alternatives with similar functionality. The best iPhone alternative is iTransmission, which is both free and Open Source. If that doesn't work for you, our users have ranked more than 10 alternatives to Transdroid, but unfortunately only two of them are available for iPhone. If you can't find an alternative you can try to filter for web or SaaS options.
iTransmission is a native BitTorrent client for jailbroken iPhones, iPods, and iPads that uses libtransmission as its backend. Currently it supports: -Adding torrents from either URL or magnet URL. -Transmission’s web interface.
dTunes is an iTunes equivalent for jailbroken iPhones and iPod Touches. It plays downloaded music and video files and torrents, and provides direct access to music and video sites for downloading files. You can only get dTunes from Cydia (on jailbroken iOS devices).