µTorrent v3.2.3 build
μTorrent, or uTorrent (see pronunciation) is a proprietary adware BitTorrent client owned and developed by BitTorrent, Inc. With over 150 million users[8] it is the most widely used BitTorrent client outside China; globally only behind Xunlei.[9] The "μ" (Greek letter "m") 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.
Early development
Out of general discontent with bloatware, Serge Paquet suggested to Ludvig Strigeus that he should make a smaller and more efficient BitTorrent client. Strigeus began to conceptualize the plans for the program's development, which, at the time, did not include making the client feature-rich. After initially working on it for about a month during the last quarter of 2004 (the first build is dated October 17, 2004), mostly during his free time before and after work, Strigeus ceased coding μTorrent for a year. He resumed work on September 15, 2005, and three days later, the first public release (version 1.1 beta) was made available as freeware, and began generating feedback.
PeerFactor SARL
On March 4, 2006, PeerFactor SARL announced the signing of a six-month contract with Strigeus for the development of "new content distribution applications on the Web."[11] PeerFactor SARL is a relatively new company formed by former employees of PeerFactor, which was a subsidiary of the French anti-piracy organization Retspan.
Ludde stated that his coding for PeerFactor SARL was to use his expertise at optimization of the BitTorrent protocol to create a .dll which PeerFactor SARL intended to use as part of a distribution platform for files in a corporate setting.[12] At the time there was some speculation that μTorrent may have been modified to spy on users on Peerfactor's behalf,[11][13] however to date (even following μTorrent's acquisition by BitTorrent, Inc.) no evidence has been produced to support these allegations.
Ownership change
On December 7, 2006, μTorrent was purchased by BitTorrent, Inc.[10]
On September 18, 2007, BitTorrent 6.0 was released. Although previous versions of the BitTorrent client had been open source software, with version 6 it became closed.
In April 2017, BitTorrent founder Bram Cohen announced that the next version of μTorrent would be web browser based. This μTorrent version allows users to stream torrents from the default web browser, similar to a regular streaming site.[14]


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