Monitor is a remote client for the popular Transmission BitTorrent client you have running at your home for your iPhone and iPad.
With Monitor you can add / pause / resume / delete downloads from the queue, like you do with the Web UI, but in a much more comfortable interface, with better integration with iOS.
Don't even need to fire up the App, if you are in a page with magnet: links, the Safari extension lets you to add them right away.
Download a .torrent file, then send it to the App to start the download on the server.
Download only the files you need and set the priority of each file.
Set the destination directory at any time, even when it's downloading, seeding or paused. Bookmark directories and see how much free space you have.
Full Transmission settings, and full download settings. Yes, full, not almost. Much more options than the WebUI.
See the connected peers like on the desktop version. Add or remove trackers. Bookmark trackers to add them later with a single tap!