A free, open-source BitTorrent client for Android with no ads, no tracking, and full offline control.
BitTorrent client. Network and storage permissions are inherent; no trackers or ads. File content is user responsibility, as with any torrent tool.
LibreTorrent is a full-featured BitTorrent client. It handles magnet links and .torrent files, sequential downloading for media streaming, per-torrent speed limits, and selective file downloads inside a torrent. Scheduling can restrict activity to Wi-Fi or specific times of day. The engine (libtorrent via jlibtorrent) runs efficiently in the background with battery-friendly wake management. RSS feeds can auto-download new episodes, and trackers, DHT, and peer exchange behave exactly as desktop clients do. The interface is Material design, the app is GPLv3 open source, and there are no ads — file sharing stays between you and the swarm.
LibreTorrent by Yaroslav Pronin — Tools app, 10 MB, requires Android 5.0+. Direct APK download on AppsDone, scanned for malware.