ΜTorrent

μTorrent
Original author(s)Ludvig Strigeus
Developer(s)Rainberry, Inc.
Initial releaseSeptember 18, 2005 (2005-09-18)
Stable release(s)
Windows3.6.0.47006  / 11 January 2024 (11 January 2024)
macOS1.8.7.45548  / 30 January 2020 (30 January 2020)
Android8.2.2  / 21 March 2024 (21 March 2024)
Preview release(s) [±]
3.6.0 Beta (build 46588) (14 November 2022 (2022-11-14)) [±]
Written inC++
Operating systemAndroid, Linux (Server version only, only officially supports very old versions of Debian and Ubuntu), Microsoft Windows, macOS
Available in60+ languages
TypeBitTorrent client
LicenseAdware
Websitewww.utorrent.com

μTorrent, or uTorrent (see pronunciation), is a proprietary adware BitTorrent client owned and developed by Rainberry, Inc. The "μ" (Greek letter "mu") in its name comes from the SI prefix "micro-", referring to the program's small memory footprint: the program was designed to use minimal computer resources while offering functionality comparable to larger BitTorrent clients such as Vuze or BitComet. μTorrent became controversial in 2015 when many users unknowingly accepted a default option during installation which also installed a cryptocurrency miner.

The program has been in active development since its first release in 2005. Although originally developed by Ludvig Strigeus, since December 7, 2006, the code is owned and maintained by BitTorrent, Inc. The code has also been employed by BitTorrent, Inc. as the basis for version 6.0 and above of the BitTorrent client, a re-branded version of μTorrent. All versions are written in C++.