Comparison of BitTorrent clients

The following is a general comparison of BitTorrent clients, which are computer programs designed for peer-to-peer file sharing using the BitTorrent protocol.^[1]

The BitTorrent protocol coordinates segmented file transfer among peers connected in a swarm. A BitTorrent client enables a user to exchange data as a peer in one or more swarms. Because BitTorrent is a peer-to-peer communications protocol that doesn't need a server, the BitTorrent definition of client differs from the conventional meaning expressed in the client–server model.^[1]

Bram Cohen, author of the BitTorrent protocol, made the first BitTorrent client, which he also called BitTorrent, and published it in July 2001.^[2]

Many BitTorrent programs are open-source software; others are freeware, adware or shareware. Some download managers, such as FlashGet and GetRight, are BitTorrent-ready. Opera 12, a web browser, can also transfer files via BitTorrent.

In 2007, four BitTorrent clients were discovered to be Trojan horses that attempt to infect Windows with malware.^[3][4][5] Those clients—BitRoll, GetTorrent, Torrent101, and TorrentQ—are excluded from the comparison tables below. In 2013, Thunder Networking Technologies admitted that some of their employees surreptitiously distributed a Trojan horse with certain releases of Xunlei, the company's BitTorrent-ready download manager.^[6][7] Xunlei is included in the comparison tables.

Applications

General

Name	Developer	Software license	Latest stable software release	Year (not dynamic, but easier for sorting)
ABC	various	PSFL	3.1 (October 2, 2005[8])	2005
Acquisition	Acquisition	Proprietary	2.2 (v223) (November 19, 2010) [±]	2010
BitComet	BitComet Development Group	Proprietary	1.40 (September 6, 2015) [±][9]	2015
BitLet	various	ASL	?	?
BitLord	House of Life	GPL installs WhenU adware	Windows: 2.4.2-298 (August 3, 2015) [±] Mac OSX: 2.4.2-303 (December 7, 2015) [±]	2015
BitSpirit	ByteLinker Inc.	Proprietary	3.6.0.550 (December 29, 2010[10]) [±]	2010
BitTornado	John Hoffman	MIT	0.3.17 (October 19, 2006) [±]	2006
BitTorrent	BitTorrent	Proprietary, Adware	Windows: 7.9.6 (Build 42179) (April 5, 2016) [±][11] Mac OS X: 7.4.3 (Build 41987) (March 17, 2016) [±][12]	2015
BitTyrant	University of Washington	GPL	1.1.1 (September 7, 2007[13]) [±]	2007
Blog Torrent	Downhill Battle	GPL	0.92 (April 20, 2005) [±]	2005
Deluge	various	GPL	1.3.12 (September 13, 2015) [±]	2015
FlashGet	Trend Media	Proprietary	3.7.0.1220 (May 17, 2013[14]) [±]	2012
Folx	Eltima Software	Proprietary	4.2.13332 (June 17, 2015) [±]	2015
Free Download Manager	alervd	GPL	3.9.7 (build 1625) (December 24, 2015) [±][15]	2015
FrostWire	The FrostWire Project	GPL Optionally installs Ask.com toolbar	6.2.3 (March 31, 2016) [±]	2016
KGet	KDE	GPL	4.14.3 (November 11, 2014) [±][16]	2014
KTorrent	Joris Guisson, Ivan Vasić	GPL	5.0.1 (April 17, 2016[17]) [±]	2013
Lftp	Alexander V. Lukya	GPL	4.6.5 (December 10, 2015 [18]) [±]	2015
LimeWire	Lime Wire LLC	GPL	5.5.16 (September 30, 2010) [±]	2010
Meerkat Bittorrent Client	47 Software	Proprietary	1.5.8 (August 28, 2011) [±]	2011
Miro	Participatory Culture Foundation	GPL	6.0 (April 16, 2013) [±][19]	2013
MLDonkey	MLDonkey Project	GPL	3.1.5 (March 22, 2014[20]) [±]	2014
µTorrent	Ludvig Strigeus	Proprietary, Adware ^[a]	Microsoft Windows: 3.4.6 (Build 42178) (April 5, 2016) [±][21][22] OS X for Intel: 1.8.7 (Build 41986) (March 17, 2016) [±][23][24] OS X for PPC: 1.6.5 (Build 27624) (July 25, 2012) [±][23][25] Android: 3.13 (November 22, 2015) [±][26][27]	2015
OneSwarm	University of Washington	GPL	0.7.5 (May 23, 2011[28]) [±]	2011
Opera 12	Opera Software	Proprietary	Windows (Presto) – 12.17 Linux, FreeBSD, MacOS X – 12.16	2016
qBittorrent	Christophe Dumez	GPL	3.3.4 (March 29, 2016) [±][29]	2016
rTorrent	Jari Sundell	GPL	rTorrent 0.9.6 / libTorrent 0.13.6 (September 3, 2015) [±][30]	2015
Shareaza	Shareaza Development Team	GPL	2.7.9.0 (October 6, 2015[31]) [±]	2015
SymTorrent	Imre Kelényi	GPL	1.50 (March 11, 2011[32]) [±]	2011
Tixati	Kevin Hearn	Proprietary	2.38 (April 28, 2016 [33]) [±]	2016
Tomato Torrent	Sarwat Khan	BT OSL	1.5.1 (October 27, 2007[34])	2007
Tonido	CodeLathe	Proprietary	3.62.0.21836 (December 31, 2012) [±]	2012
TorrentFlux	various	GPL	2.4 (June 18, 2008[35]) [±]	2008
Transmission	various	GPL/MIT	2.92 (March 6, 2016) [±][36]	2016
Tribler	The Tribler Team	LGPL	6.5.1 (March 15, 2016) [±][37]	2016
Vuze (formerly Azureus)	Vuze	Proprietary (platform), GPL (core engine), Adware	5.7.1.0 (February 22, 2016) [±][38]	2015
Wyzo	Radical Software	Proprietary	3.6.4 (September 24, 2010) [±]	2010
Xunlei	Thunder Networking Technologies	Proprietary	Microsoft Windows: 7.9.42.5050 (2 December 2015) [±][39] OS X: 2.6.7 (17 March 2015) [±][39] iOS: 5.7 (September 6, 2015) [±][39] Android: 5.11 (28 November 2015) [±][39]	2015
Name	Developer	Software license	Latest stable software release	Year

a : The option to disable ads is included in the settings.^[40]

Operating system support

BitTorrent client	Windows	Mac OS X	Linux	BSD	iOS	Android	Other
ABC	Yes	No	Yes	No	No	No	No
Acquisition	No	Yes	No	No	No	No	No
BitComet	Yes	No	No	No	No	No	No
BitLet	web	web	web	No	No	No	No
BitLord	Yes	Yes	No	No	No	No	No
BitSpirit	Yes	No	No	No	No	No	No
BitTornado	Yes	Yes	Yes	Yes	No	No	No
BitTorrent	Yes	Yes	No	No	No	Yes	No
BitTyrant	Yes	Yes	Yes	Yes	No	No	No
Blog Torrent	Yes	Yes	No	No	No	No	No
Deluge	Yes	Yes	Yes	Yes	No	No	Solaris
FlashGet	Yes	No	No	No	No	No	No
Folx	No	Yes	No	No	No	No	No
Free Download Manager	Yes	Yes	No	No	No	No	No
Frostwire	Yes[41]	Yes[41]	Yes[41]	Yes[41]	No[41]	Yes[41]	Unix-like,[41] z/OS,[42] Solaris, OS/2, eComStation[43]
KGet	No	No	Yes	Yes	No	No	No
KTorrent	No	Yes	Yes	Yes	No	No	No
LimeWire	Yes	Yes	Yes	Yes	No	No	Yes
Meerkat Bittorrent Client	Yes	No	No	No	No	No	No
Miro	Yes	Yes	Yes	Yes	No	No	No
MLDonkey	Yes	Yes	Yes	Yes	No	No	Solaris, MorphOS
µTorrent	Yes	Yes	web	No	No	Yes	No
OneSwarm	Yes	Yes	Yes	No	No	No	No
Opera 12	Yes[Note 1]	Yes	Yes[Note 1]	Yes[Note 1]	No	Yes	Solaris
qBittorrent	Yes[44]	Yes[44]	Yes[44]	Yes[44]	Yes[44]	Yes[44]	eComStation
rTorrent	Yes, through Cygwin[45]	Yes	Yes	Yes	No	No	Solaris
Shareaza	Yes	No	No	No	No	No	No
SymTorrent	No	No	No	No	No	No	Symbian
Tixati	Yes	No	Yes	No	No	No	No
Tomato Torrent	No	Yes	No	No	No	No	No
Tonido	Yes	Yes	Yes	Yes	No	No	No
TorrentFlux	Yes	Yes	Yes	Yes	No	No	No
Transmission	Yes as an unofficial build[Note 1]	Yes	Yes	Yes	Yes, through Cydia	No	Solaris, OpenWrt
Tribler	Yes	Yes	Yes	Yes	No	Yes	No
Vuze	Yes	Yes	Yes	Yes	No	Yes	No
Wyzo	Yes	Yes	No	No	No	No	No
Xunlei	Yes	Yes	No	No	Yes	Yes	No
Name	Windows	Mac OS X	Linux	BSD	iOS	Android	Other

Interface and programming

BitTorrent client	GUI	Remote	CLI	Other	Programming language	Based on	IPv6	µTP
ABC	Yes	Yes	No	No	Python	BitTornado	buggy[Note 2]	No
Acquisition	Yes	No	No	No	Objective-C, Cocoa	Limewire	No	No
BitComet	Yes	Yes	Partial[46]	No	C++	-	No	No
BitLet	No	No	No	Webapp	Java Applet	-	No	No
BitLord	Yes	No	No	No	Python, C++	libtorrent (Rasterbar)	Yes	No
BitTornado	Yes	No	Partial	No	Python	BitTorrent	Yes	No
BitTorrent 5, Mainline	Yes	No	Partial	No	Python	-	No	No
BitTorrent 6	Yes	Yes	Partial	No	C++	µTorrent	Yes	Yes
BitTyrant	Yes	Yes	Partial	Telnet, XML over HTTP remote control API	Java, SWT	Azureus	Yes	No
Blog Torrent	Yes	No	No	No	?	?	No	No
Deluge	Yes	Yes	Yes	Daemon	Python, C++	libtorrent (Rasterbar)	Yes	Yes[47]
FlashGet	Yes	No	No	No	?	?	No	No
Free Download Manager	Yes	Yes	Partial	No	C++	libtorrent (Rasterbar)	No	No
Frostwire	Yes	No	No	No	Java	LimeWire	No	Yes[48]
KGet	Yes	Yes	Partial[Note 3]	No	C++	-	Yes	No
KTorrent	Yes	Yes	Partial	No	C++	-	Yes	Yes[49]
LimeWire	Yes	No	No	No	Java	libtorrent (Rasterbar)	No	No
Meerkat Bittorrent Client	Yes	No	No	No	C++	-	No	No
Miro	Yes	No	No	No	C++	libtorrent (Rasterbar)	No	No
MLDonkey	Network GUI	Yes	Partial	Telnet	OCaml	-	No	No
µTorrent	Yes	Yes	No[50]	RESTful Web API[51]	C++[52]	-	Yes[53]	Yes[54]
OneSwarm	Partial	Yes	No-partial	No	Java	Azureus	Yes	No
Opera 12	Yes	No	No	No	C++	-	Yes	No
qBittorrent	Qt (toolkit)	Yes	Partial	No	C++, Python	libtorrent (Rasterbar)	buggy[Note 4]	Yes[55]
rTorrent	No	Third Party	Yes	SCGI	C++	libTorrent (Rakshasa)	No[56]	No
Shareaza	Yes	Yes	Partial	No	C++	-	No	No
SymTorrent	Yes	No	No	No	?	?	No	No
Tixati	Yes	Yes	No	No	C++	-	Yes	Yes[57]
Tomato Torrent	Yes	No	No	No	Cocoa	BitTorrent	No	No
Tonido	No	Yes	No	No	C++	libtorrent (Rasterbar)	No	No
TorrentFlux	No	Yes	No	No	PHP	BitTornado	No	No
Transmission	Yes	Yes	Yes	Daemon, JSON-RPC over HTTP remote control API	C, Objective-C	-	Yes	Yes[58]
Tribler	Yes	Partial	Partial	No	Python,C++	libtorrent (Rasterbar)	No	Yes
Vuze (formerly Azureus)	Yes	Yes	Partial	Telnet, XML over HTTP remote control API	Java, SWT	-	Yes	Yes[59]
Xunlei	Yes	No	No	remote control over internet[60]	C++	-	No	No
BitTorrent client	GUI	Web	CLI	Other	Programming language	Based on	IPv6	µTP

Features I

BitTorrent client	Magnet URI	Preload Magnet metadata [Note 5]	Super-seeding	Embedded tracker	UPnP [Note 6]	NAT Port Mapping Protocol	NAT traversal [Note 7]	DHT [Note 8]	Peer exchange	Encryption	UDP tracker	LPD	Proxy server
ABC	No	No	No	Yes	Yes	No	No	No	No	No	No	No	No
Acquisition	No	No	No	No	No	Yes	No	No	No	No	No	No	No
BitComet	Yes	No	Yes	Separate download	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	HTTP 1.1, SOCKS4-4a-5
BitLet	No	No	No	No	Yes	No	No	No	No	No	No	No	No
BitLord	Yes	No	No	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	HTTP 1.1, SOCKS4-4a-5
BitTornado	No	No	Yes	Yes[Note 9]	Yes	No	No	No	No	Yes	No	No	No
BitTorrent 5, Mainline	No	No	No	Yes[Note 9]	Yes	Yes	No	Yes	Yes	Yes	No	No	Yes
BitTorrent 6	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes[Note 10]	Yes	Yes	Yes	HTTP(S), SOCKS4-5
BitTyrant	No	No	Yes	Yes	Yes	Yes	Yes[Note 11]	Yes[Note 12]	Yes	Yes	No	No	No
Blog Torrent	No	No	No	Yes	No	No	No	No	No	No	No	No	No
Deluge	Yes	No	No	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	HTTP(S), SOCKS4-5
FlashGet	No	No	No	No	No	No	No	Yes	No	Yes	No	No	No
Free Download Manager	Yes	No	No	No	No	No	No	Yes	Yes	No	No	No	No
KTorrent	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Partial	HTTP, SOCKS4-5
LimeWire	Partial	No	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	No	No
Meerkat Bittorrent Client	No	No	Yes	No	Yes	Yes	Yes	Yes	No	Yes	No	No	No
MLDonkey	Yes[61]	No	No	Yes	Yes	Yes	No	Yes	No	No	Yes	No	No
µTorrent	Yes	Yes[62]	Yes[63]	Yes[64]	Yes[65]	Yes	Yes[66]	Yes[Note 13]	Yes[Note 10]	Yes[67]	Yes	Yes[68]	HTTP(S), SOCKS4-5
OneSwarm	No	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	No
Opera 12	No	No	No	Yes[69]	No	No	No	No	Yes[70]	No	No	No	No
qBittorrent	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	HTTP(S), SOCKS4-5
rTorrent	Yes[71]	No	Yes	No	No	No	No	Yes	Yes	Yes	Yes	No[72]	No
Shareaza	Yes	No	No	No	Yes	Yes	No	Yes[Note 14]	Yes	No	Yes[Note 15]	No	No
SymTorrent	No	No	No	No	No	No	No	No	No	No	No	No	No
Tixati	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Tomato Torrent	No	No	No	Yes	No	No	No	Yes	No	No	No	No	No
Tonido	No	No	No	No	Yes	Yes	Yes	Yes	No	No	No	No	No
TorrentFlux	No	No	Yes	No	Yes	No	No	No	No	Yes	No	No	No
Transmission	Yes	Yes[73][74][75]	No	No	Yes	Yes	Yes	Yes	Yes[Note 16]	Yes	Yes	Yes	No[76]
Tribler	Yes	No	No	Yes	Yes	Yes	No	Yes	Yes	Yes	No	No	Uses P2P onion routing to provide anonymity.
Vuze (formerly Azureus)	Yes	Yes	Yes	Yes	Yes	Yes	Yes[Note 17]	Yes[Note 12]	Yes	Yes	Yes	Plugin	HTTP(S)?, SOCKS4-4a-5
Xunlei	Yes	No	No	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	HTTP, SOCKS5, FTP
BitTorrent client	Magnet URI	Preload Magnet metadata	Super-seeding	Embedded tracker	UPnP	NAT Port Mapping Protocol	NAT traversal	DHT	Peer exchange	Encryption	UDP tracker	LPD	Proxy server

Features II

BitTorrent client	Cache [Note 18]	Hash Web seeding	HTTP Web seeding	Broad-catching (RSS)	Prioritization	Selective downloads	Sequential downloading	SOCKS	Tracker exchange [77]	Remote control via web	Search engine	Auto updates	Reviews and Comments	Notes
ABC	No	Yes		No	Yes	No	No	No	No	Yes	Separate download	No	No
Acquisition	No	No		No	No	No	No	No	No	No	No	No	No	3 torrents max, infinity when registered
BitComet	Yes	No	Yes[78]	Beta	Yes	Yes	Yes[Note 19]	Yes	No	Yes	Built-in Web browser	Yes	No	Portable version available
BitLet	No	No	No	No	No	No	No	No	No	No	No	Yes	No
BitLord	Yes	No		Yes	Yes	Yes	No	Yes	No	No	Built-in Web browser	Yes	No
BitTornado	Yes	Yes	No	No	Yes	Yes	No	No	No	No	No	via PMS	No
BitTorrent 5, Mainline	No	Yes		No	Yes	Yes	No	No	No	No	Yes	Yes	No
BitTorrent 6	Yes	Yes		Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes
BitTyrant	Yes	Yes[79]	Yes	Plugin	Yes	Yes	No	Yes	No	Plugin[Note 20]	3rd party plugins	Yes	No	Upload priority optimized according to a series of research papers
Blog Torrent	No	No	No	No	No	No	No	No	No	No	No	No	No
Deluge	Yes	Yes	Yes	Plugin	Yes	Yes	No	Yes	No	Yes	No	via PMS	No
FlashGet	No	No		No	No	No	No	No	No	No	No	No	No	FlashGet (standalone application) is not FlashGot (Firefox Addon)
Free Download Manager	No	Yes	Yes	No	Yes	Yes	No	No	No	Yes	No	Optional	No
KTorrent	Yes	Yes		Yes	Yes	Yes	Yes	Yes	No	Yes	Built-in Web browser	via PMS	No
LimeWire	Yes	Yes		No	Yes	Yes	No	Yes	No	No	No	Yes	No
Meerkat Bittorrent Client	Yes	No		No	No	No	No	No	No	No	No	No	No
MLDonkey	Yes	No		3rd party bash script	Yes	No	No	No[80]	No	Yes	Built-in Web browser	via PMS	No
µTorrent	Yes	Yes[81]		Yes[82]	Yes[83]	Yes	Yes[Note 21]	Yes	No	Yes	Yes	Yes	Yes
OneSwarm	Yes	Yes		No	Yes	Yes	No	Yes	No	No	No	Yes	No	has all BitTyrant features
Opera 12	No	No		Yes[Note 22]	No	No	No	No	No	No	built-into Web browser	Windows and Mac OS X only; via PMS on Linux	No	Web browser
qBittorrent	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	via PMS	No
rTorrent	Partial	No	No	3rd party utility [84]	Yes	Yes	No	No	No	Yes	No	via PMS	No	No built-in disk cache but a delayed sync
Shareaza	Yes	Yes		No	Yes	Yes[Note 23]	in mod client	No	Yes [Note 24][85][Note 25]	Yes	Yes	Yes	No	[Note 26]
SymTorrent	No	No		No	No	No	No	No	No	No	No	No	No	BitTorrent client for cell phones
Tixati	Yes	Yes		Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	No	lightweight client, Portable version available, option to keep all peers unchoked available
Tomato Torrent	No	No	No	No	No	No	No	No	No	No	No	No	No	supports AppleScript
Tonido	No	No		No	Yes	Yes	No	No	No	Yes	No	Yes	No
TorrentFlux	Yes	Yes	No	Yes	Yes	Yes	No	No	No	Yes	Yes	No	No
Transmission	Yes	No	Yes	No	Yes	Yes	Yes[86][87]	No	No	Yes	No	Yes	No
Tribler	Yes	No	No	Yes	Yes	Yes	No	No	No	Partial	Yes	Yes	No	Fully distributed keyword search; integrated anti-spam measures[88]
Vuze (formerly Azureus)	Yes		Yes[79]	Yes	Yes	Yes	in paid version [89]	Yes	No	Plugin[Note 20]	Yes	Yes	Yes[90]	The only client to bridge between i2p and the clearnet.
Xunlei	Yes	No		Yes	Yes	Yes	Yes			Yes	No	Yes	No
BitTorrent client	Cache	Hash Web seeding	HTTP Web seeding	Broad-catching (RSS)	Prioritization	Selective downloads	Sequential downloading	SOCKS	Tracker exchange	Remote control via web	Search engine	Auto updates	Reviews and Comments	Notes

1. x86-32 and x86-64builds available.
2. Announcements to the tracker are made via IPv6 if possible, but the client doesn't listen on the respective port.
3. Qdbus interface
4. Dual stack not supported; cannot use both IPv4 and IPv6 at the same time."GitHub Pull Request to enable dual-stack for qBittorrent". qBittorrent on GitHub.
5. For a torrent added from a Magnet link, obtain the list of files (and other metadata) before prompting the user for a download location.
6. Automatically configure port forwarding (requires Router with UPnP support)
7. Many clients claim to support this, but just UPnP calls for opening a TCP port is not effective and disabled by factory default in most new hardware. "UDP NAT Traversal" is the proper working solution, supported by just a few.
8. DHT permits use of trackerless torrents (with supporting clients) to resume normal torrents when their tracker is down. However, some trackers that register their users for keeping tabs on fair usage (such as a ratio of bytes downloaded to uploaded) may not reliably measure and update usage for users employing DHT.
9. Tracker included with Linux binaries and with source, but not with Windows binary.
10. Exchanging with BT 6 and µTorrent clients (and now MooPolice).
11. It's UDP based, an experimental feature and only supported by other Azureus based clients.
12. Has its own DHT, a mainline-DHT compatible implementation is available as plugin.
13. µTorrent's DHT implementation is the same as Mainline and BitComet's, but unfortunately this is incompatible with Azureus's implementation.
14. Since Shareaza v2.6.0.0, Shareaza includes Mainline DHT support. Also, Shareaza can use the Gnutella2 network to find other Gnutella2 clients sharing the same torrent. This also includes clients who do not actively seed the torrent in question anymore, as long as file hashes (such as sha1 for example) are known.
15. Since Shareaza v2.5.5.1 r9064.
16. Exchanges with µTorrent and Azureus peers.
17. Since version 2.5.0.2. It's UDP based, an experimental feature and only supported by other Azureus clients.
18. Reduces disk usage, file fragmentation (in case it is not preallocated) and latencies via larger written blocks and cached data for hash checking finished pieces.
19. Called "preview mode"
20. Provides a Java-based and a simple HTML/JS based WebUI.
21. From version 3.0 this feature is called "Streaming mode". The number of pieces to download sequentially is configurable
22. Opera has a feed aggregator that displays feeds like emails.
23. Since Shareaza v2.4.0.2 r7924.
24. Since Shareaza v2.5.3.1.
25. Shareaza also uses G2 to transmit download metadata, such as BitTorrent trackers to other G2 clients.
26. Maximum active torrent number depends on respective user settings and is limited to 31.

Vulnerabilities

This comparison of unpatched publicly known vulnerabilities in latest stable version clients is based on vulnerabilities reports by SecurityFocus and Secunia. See computer security for more details about the importance of unpatched known flaws.

BitTorrent client	Known unpatched vulnerabilities
	Secunia					SecurityFocus
	Extremely critical (number / oldest)	Highly critical (number / oldest)	Moderately critical (number / oldest)	Less critical (number / oldest)	Not critical (number / oldest)	Total (number / oldest)
BitComet	0	0	0	0	0	0
BitLord	0	0	0	0	0	Unknown
BitTornado	0	0	0	0	0	Unknown
BitTorrent	0	0	0	0	0	0
BitTorrent DNA	0	0	0	0	0	0
BitTyrant	0	0	0	0	0	Unknown
Deluge	0	0	0	0	0	0
FlashGet	0	0	0	0	0	1 13 August 2008
Free Download Manager	0	0	0	0	0	0
FrostWire	0	0	0	0	0	Unknown
KTorrent	0	0	0	0	0	0
Libtorrent (Rasterbar)	0	0	0	0	0	0
LimeWire	0	0	0	0	0	0
Miro	0	0	0	0	0	1 26 February 2008
MLDonkey	0	0	0	0	1 5 November 2003	1 23 February 2009
µTorrent for Mac	0	0	0	0	0	0
µTorrent for Windows	0	0	0	0	0	0
Opera 12	0	0	0	0	0	0
Shareaza	0	0	0	0	0	0
Tixati	0	0	0	0	0	Unknown
Tomato Torrent	0	0	0	0	0	Unknown
TorrentFlux	0	0	1 23 April 2008	0	0	2 18 April 2008
Transmission	0	0	0	0	0	0
Vuze (formerly Azureus)	0	0	0	0	0	1 22 June 2006
Wyzo	0	0	0	0	0	Unknown
Xunlei	0	2 28 September 2007	0	0	0	1 17 November 2007
BitTorrent client	Extremely critical (number / oldest)	Highly critical (number / oldest)	Moderately critical (number / oldest)	Less critical (number / oldest)	Not critical (number / oldest)	Total (number / oldest)
	Secunia					SecurityFocus
	Known unpatched vulnerabilities

Libraries

General

BitTorrent library	First public release date	Latest stable	Software license
libtorrent (Rasterbar)	8 September 2005[91]	1.1.0 (April 10, 2016) [±]	Free software
MonoTorrent	September 2006	0.90 (May 22, 2010) [±]	Free software
rTorrent (libTorrent Rakshasa)	15 July 2004[92]	rTorrent 0.9.6 / libTorrent 0.13.6 (September 3, 2015) [±][93]	Free software
BitTorrent library	First public release date	Latest stable	Software license

Operating system support and programming language

BitTorrent library	Linux/Unix	Windows	OS X	API	Programming language
libtorrent (Rasterbar)	Yes	Yes	Yes	Yes	C++
MonoTorrent	Yes	Yes	Yes	Yes	C#
rTorrent (libTorrent Rakshasa)	Yes	No	Yes	Yes	C++
BitTorrent library	Linux/Unix	Windows	OS X	API	Programming language

Supported features 1

BitTorrent library	Super-seeding	Tracker	UPnP [Note 1]	NAT Port Mapping Protocol	NAT traversal [Note 2]	DHT [Note 3]	Peer exchange	Encryption	UDP tracker	LPD	Fast extensions	Magnet URI	µTP
libtorrent (Rasterbar)	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes[94]	Yes	Yes	Yes[95]
MonoTorrent	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No
rTorrent (libTorrent Rakshasa)	Yes	Yes	No	?	?	Yes	Yes	Yes	Yes	?	No	Yes	No
BitTorrent library	Super-seeding	Tracker	UPnP	NAT Port Mapping Protocol	NAT traversal	DHT	Peer exchange	Encryption	UDP tracker	LPD	Fast extensions	Magnet URI	µTP

Supported features 2

BitTorrent library	Cache[Note 4]	Web seeding [Note 5]	Broadcatching (RSS)	Prioritization	Selective downloads	SOCKS	Remote control via web	Engine	Notes
libtorrent (Rasterbar)	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?
MonoTorrent	Yes	Yes	Yes	Yes	Yes	No	Yes	No
rTorrent (libTorrent Rakshasa)	Partial	No	No	Yes	Yes	No	Yes	No	No built-in cache-disk cache but a delayed sync
BitTorrent library	Cache	Web seeding	Broadcatching (RSS)	Prioritization	Selective downloads	SOCKS	Remote control via web	Engine	Notes

Notes

1. Automatically configure port forwarding (requires Router with UPnP support)
2. Many clients claim to support this, but just UPnP calls for opening a TCP port is not effective and disabled by factory default in most new hardware. "UDP NAT Traversal" is the proper working solution, supported by just a few.
3. DHT permits use of trackerless torrents (with supporting clients) to resume normal torrents when their tracker is down. However, some trackers that register their users for keeping tabs on fair usage (such as a ratio of bytes downloaded to uploaded) may not reliably measure and update usage for users employing DHT.
4. Reduces disk usage, file fragmentation (in case it is not preallocated) and latencies due to larger written blocks and cached data for hash checking finished pieces.
5. Recently implemented (unofficial) web seeding feature, see HTTP-Based Seeding Specification

See also

• Anonymous P2P
• BitTorrent tracker
• Comparison of BitTorrent sites
• Comparison of BitTorrent tracker software
• Comparison of file sharing applications
• File sharing
• Open Music Model
• Timeline of file sharing

References

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77. Tracker exchange spec: BEP 28
78. Supports the Getright Webseeding spec since v1.14, see BitComet Wiki
79. Supports the Getright Webseeding spec in addition to the Bittornado spec
80. See task #4401 SOCKS proxy; however, http proxy is supported.
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84. 3rd party utility RSSDler
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External links

• User-ranked list of bittorrent clients
• BitTorrent at DMOZ
• Article suggesting that a BitTorrent client is installed on more than 13% of Windows desktop PCs