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]

"BitTorrent client" redirects here. For the software application by Bram Cohen, see BitTorrent (software).

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 does not 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 2013 Thunder Networking Technologies publicly revealed that some of their employees surreptitiously distributed a Trojan horse with certain releases of Xunlei, the company's BitTorrent-ready download manager.[3][4] Xunlei is included in the comparison tables.

Applications

General

Name	Developer	Software license	Latest stable software release	Operating system	Year (not dynamic, but easier for sorting)
BitComet	BitComet Development Group	Proprietary, Adware	1.66 (April 13, 2020 (2020-04-13)) [±][5]	Windows, macOS	2018
BitLord	House of Life	Proprietary, Adware installs WhenU adware	Windows: 2.4.6-354 (July 29, 2020 (2020-07-29)) [±] macOS: 2.4.6-348 (October 24, 2019 (2019-10-24)) [±]	Windows, macOS	2017
BitTorrent	BitTorrent	Proprietary, Adware	Windows 7.10.5.45665 / June 9, 2020 (2020-06-09)[6] Mac 7.4.3.43797 / September 4, 2019 (2019-09-04)[7] Android 6.2.0 / March 30, 2020 (2020-03-30)[8][9]	Windows, macOS	2018
Deluge	various	GPL	2.0.3 (June 12, 2019 (2019-06-12)) [±]	Windows, macOS, Linux, BSD	2019
FlashGet	Trend Media	Proprietary	3.7.0.1220 (May 17, 2013 (2013-05-17)[10]) [±]	Windows	2013
Folx	Eltima Software	Proprietary, Setapp	5.20.13946 (June 10, 2020 (2020-06-10)) [±][11]	macOS	2020
Free Download Manager	alervd	Proprietary	6.10.0 (build 3016) (5 June 2020; 19 days ago)	Windows, macOS, Android	2018
FrostWire	The FrostWire Project	GPL	6.8.4 (build 292) (January 31, 2020 (2020-01-31)) [±]	Windows, macOS, Linux, Android	2019
KGet	KDE	GPL	4.14.38 (November 7, 2017 (2017-11-07)) [±][12]	Linux	2019
KTorrent	Joris Guisson, Ivan Vasić	GPL	5.2.0 (June 6, 2020 (2020-06-06)[13]) [±]	Linux	2020
Lftp	Alexander V. Lukya	GPL	4.9.1 (January 15, 2020 (2020-01-15)[14]) [±]	Linux	2018
LimeWire	Lime Wire LLC	GPL	5.5.16 (September 30, 2010 (2010-09-30)) [±]	Windows, macOS, Linux	2010
Miro	Participatory Culture Foundation	GPL	6.0 (April 16, 2013 (2013-04-16)) [±][15]	Windows, macOS, Linux	2013
MLDonkey	MLDonkey Project	GPL	3.1.7 (July 6, 2020 (2020-07-06)[16]) [±]	Windows, macOS, Linux, MorphOs	2014
μTorrent	BitTorrent	Proprietary, Adware ^[a]	Template:Latest stable software release/μTorrent	Windows, macOS, Android	2018
Opera 12	Opera Software	Proprietary	Windows (Presto) – 12.17 Linux, FreeBSD, macOS – 12.16	Windows, macOS, Linux	2016
qBittorrent	Christophe Dumez	GPL	4.2.5 (April 25, 2020 (2020-04-25)) [±][17] [18]	Windows, macOS, Linux, BSD	2020
rTorrent	Jari Sundell	GPL	rTorrent 0.9.8 / libTorrent 0.13.8 (July 19, 2019 (2019-07-19)) [±][19]	Linux	2019
Robert	Sponge, co-developer of I2P	GPL	Template:Latest stable software release/Robert (P2P software)		2009
Shareaza	Shareaza Development Team	GPL	2.7.10.2 (September 18, 2017 (2017-09-18)[20]) [±]	Windows	2017
Tixati	Kevin Hearn	Proprietary	2.74 (July 10, 2020 (2020-07-10)[21]) [±]	Windows, Linux	2020
Tonido	CodeLathe	Proprietary	3.62.0.21836 (December 31, 2012 (2012-12-31)) [±] Du	Windows, macOS, Linux, BSD	2012
Transmission	various	GPL/MIT	3.00 (May 22, 2020 (2020-05-22)) [±][22]	Windows, macOS, Linux, BSD	2020
Tribler	The Tribler Team	LGPL	7.4.4 (February 21, 2020 (2020-02-21)) [±][23]	Windows, macOS, Linux, Android	2019
Vuze (formerly Azureus)	Vuze	Proprietary (platform), GPL (core engine), Adware	5.7.6.0 (November 2, 2017 (2017-11-02)) [±][24]	Windows, macOS, Linux, Android	2017
Xunlei	Thunder Networking Technologies	Proprietary	Microsoft Windows: 9.1.43.938 (10 November 2017 (2017-11-10)) [±][25] macOS: 3.1.7.3266 (27 October 2017 (2017-10-27)) [±][25] iOS: 5.20 (18 June 2016 (2016-06-18)) [±][25] Android: 5.33 (28 February 2017 (2017-02-28)) [±][25]	Windows, macOS, Android, iOS	2017
Name	Developer	Software license	Latest stable software release		Year

a : The option to disable ads is included in the settings.[26]

Operating system support

BitTorrent client	Windows	macOS	Linux	BSD	iOS	Android	Other
BitComet	Yes	Yes	No	No	No	No	No
BitLord	Yes	Yes	No	No	No	No	No
BitTorrent	Yes	Yes	No	No	No	Yes[27]	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[28]	Yes[28]	Yes[28]	Yes[28]	No[28]	Yes[28]	Unix-like,[28] z/OS,[29] Solaris, OS/2, eComStation[30]
KGet	No	No	Yes	Yes	No	No	No
KTorrent	No	Yes	Yes	Yes	No	No	No
Lftp	Yes	Yes	Yes	Yes	No	No	No
LimeWire	Yes	Yes	Yes	Yes	No	No	Yes
Miro	Yes	Yes	Yes	Yes	No	No	No
MLDonkey	Yes	Yes	Yes	Yes	No	No	Solaris, MorphOS
μTorrent	Yes	Yes	Web	No	No	Yes[31]	No
Opera 12	Yes[Note 1]	Yes	Yes[Note 1]	Yes[Note 1]	No	Yes	Solaris
qBittorrent	Yes[32]	Yes[32]	Yes[32]	Yes[32]	No[32]	No[33]	eComStation[32]
Robert	Yes	Yes	Yes	Yes	No	No	No
rTorrent	Yes, through Cygwin[34]	Yes	Yes	Yes	No	No	Solaris
Shareaza	Yes	No	No	No	No	No	No
Tixati	Yes	No	Yes	No	No	No	No
Tonido	Yes	Yes	Yes	Yes	No	No	No
Transmission	Yes [Note 1]	Yes	Yes	Yes	Yes, through Cydia	No	Solaris, OpenWrt
Tribler	Yes	Yes	Yes	Yes	No	No	No
Vuze	Yes	Yes	Yes	Yes	No	Yes[35]	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
BitComet	Yes	Yes	Partial[36]	No	C++	-	Yes	No
BitLord	Yes	No	No	No	Python, C++	libtorrent (Rasterbar)	Yes	No
BitTorrent 5, Mainline	Yes	No	Partial	No	Python	-	No	No
BitTorrent 6	Yes	Yes	Partial	No	C++	μTorrent	Yes	Yes
Deluge	Yes	Yes	Yes	Daemon	Python, C++	libtorrent (Rasterbar)	Yes	Yes[37]
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	libtorrent (Rasterbar)	No	Yes[38]
KGet	Yes	Yes	Partial[Note 2]	No	C++	-	Yes	No
KTorrent	Yes	Yes	Partial	No	C++	-	Yes	Yes[39]
LimeWire	Yes	No	No	No	Java	libtorrent (Rasterbar)	No	No
Miro	Yes	No	No	No	C++	libtorrent (Rasterbar)	No	No
MLDonkey	No	Third Party[40]	Partial	Telnet	OCaml	-	No	No
μTorrent	Yes	Yes	No[41]	RESTful Web API[42]	C++[43]	-	Yes[44]	Yes[45]
Opera 12	Yes	No	No	No	C++	-	Yes	No
qBittorrent	Yes	Yes	Partial	No	Python, C++	libtorrent (Rasterbar)	Yes	Yes[46]
rTorrent	No	Third Party	Yes	SCGI	C++	[libTorrent] (Rakshasa)	Yes[47]	No
Shareaza	Yes	Yes	Partial	No	C++	-	No	No
Tixati	Yes	Yes	No	Web interface	C++	-	Yes	Yes[48]
Tonido	No	Yes	No	No	C++	libtorrent (Rasterbar)	No	No
Transmission	Yes	Yes	Yes	Daemon, JSON-RPC over HTTP remote control API	C, Objective-C	libtransmission	Yes	Yes[49]
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[50]
Xunlei	Yes	No	No	remote control over internet[51]	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 3]	Super-seeding	Embedded tracker	UPnP [Note 4]	NAT Port Mapping Protocol	NAT traversal [Note 5]	DHT [Note 6]	Peer exchange	Encryption	UDP tracker	LPD	Proxy server
BitComet	Yes	No	Yes	Separate download	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	HTTP 1.1, SOCKS4-4a-5
BitLord	Yes	No	No	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	HTTP 1.1, SOCKS4-4a-5
BitTorrent 5, Mainline	No	No	No	Yes[Note 7]	Yes	Yes	No	Yes	Yes	Yes	No	No	Yes
BitTorrent 6	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes[Note 8]	Yes	Yes	Yes	HTTP(S), SOCKS4-5
Deluge	Yes	Partial[Note 9]	Yes	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
MLDonkey	Yes[52]	No	No	Yes	Yes	Yes	No	Yes	No	No	Yes	No	No
μTorrent	Yes	Yes[53]	Yes[54]	Yes[55]	Yes[56]	Yes	Yes[57]	Yes[Note 10]	Yes[Note 8]	Yes[58]	Yes	Yes[59]	HTTP(S), SOCKS4-5
Opera 12	No	No	No	Yes[60]	No	No	No	No	Yes[61]	No	No	No	No
qBittorrent	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	HTTP(S), SOCKS4-5
rTorrent	Yes[62]	No	Yes	No	No	No	No	Yes	Yes	Yes	Yes	No[63]	No
Shareaza	Yes	No	No	No	Yes	Yes	No	Yes[Note 11]	Yes	No	Yes[Note 12]	No	No
Tixati	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	only with out going without DHT if anonymity required
Tonido	No	No	No	No	Yes	Yes	Yes	Yes	No	No	No	No	No
Transmission	Yes	Patch available[64][65][66]	No	No	Yes	Yes	No[67]	Yes	Yes[Note 13]	Yes	Yes	Yes	No[68]
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 14]	Yes[Note 15]	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 16]	Hash Web seeding	HTTP Web seeding	Broad-catching (RSS)	Prioritization	Selective downloads	Sequential downloading	SOCKS	Tracker exchange [69]	Remote control via web	Search engine	Auto updates	Reviews and Comments	Notes
BitComet	Yes	No	Yes[70]	Beta	Yes	Yes	Yes[Note 17]	Yes	No	Yes	Built-in Web browser	Yes	No	Portable version available
BitLord	Yes	No	Partial [Note 18][Note 19]	Yes	Yes	Yes	No	Yes	No	No	Built-in Web browser	Yes	No
BitTorrent 5, Mainline	No	Yes	Partial [Note 19]	No	Yes	Yes	No	No	No	No	Yes	Yes	No
BitTorrent 6	Yes	Yes		Yes	Yes	Yes	Yes[Note 20]	Yes	No	Yes	Yes	Yes	Yes
Deluge	Yes	Yes	Partial [Note 18]	Plugin	Yes	Yes	Yes	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	No	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	No	Yes	Yes	No	Yes	No	No	No	Yes	No
MLDonkey	Yes	No		3rd party bash script	Yes	No	No	No[71]	No	Yes	Built-in Web browser	via PMS	No
μTorrent	Yes	Yes[72]	Partial [Note 19]	Yes[73]	Yes[74]	Yes	Yes[Note 21]	Yes	No	Yes	Yes	Yes	Yes
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	Partial [Note 18]	Yes	Yes	Yes	Yes	Yes	hard-coded as disabled in newer versions	Yes	Yes	via PMS	No
rTorrent	Partial	No	No	3rd party utility [75]	Yes	Yes	No	No	No	Yes	No	via PMS	No	No built-in disk cache but a delayed sync
Shareaza	Yes	Yes	No	No	Yes	Yes[Note 23]	in mod client	No	Yes [Note 24][76][Note 25]	Yes	Yes	Yes	No	[Note 26]
Tixati	Yes	Yes	Partial [Note 18][Note 27][Note 19]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	No	lightweight client, Portable version available, option to keep all peers unchoked available Integral encrypted chatrooms that allow streaming audio and video, link sharing and searching
Tonido	No	No		No	Yes	Yes	No	No	No	Yes	No	Yes	No
Transmission	Yes	No	Partial [Note 19][Note 28]	No	Yes	Yes	No	No	No	Yes	No	Yes	No
Tribler	Yes	No	No	Yes	Yes	Yes	No	No	No	Partial	Yes (DHT)[77]	Yes	No	Fully distributed keyword search; integrated anti-spam measures[78]
Vuze (formerly Azureus)	Yes		Yes[79]	Yes	Yes	Yes	in paid version [80]	Yes	No	Plugin[Note 29]	Yes	Yes	Yes[81]	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 x86-64 builds available
2. Qdbus interface
3. For a torrent added from a Magnet link, obtain the list of files (and other metadata) before prompting the user for a download location.
4. Automatically configure port forwarding (requires Router with UPnP support)
5. 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.
6. 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.
7. Tracker included with Linux binaries and with source, but not with Windows binary.
8. Exchanging with BT 6 and μTorrent clients (and now MooPolice).
9. This is done manually. Right click an item and select "Force Re-Check". This will trigger preload. Note, if deluge is restarted before preload finishes, it will continue downloading torrent content.
10. μTorrent's DHT implementation Archived 18 March 2009 at the Wayback Machine is the same as Mainline and BitComet's, but unfortunately this is incompatible with Azureus's implementation.
11. 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.
12. Since Shareaza v2.5.5.1 r9064.
13. Exchanges with μTorrent and Azureus peers.
14. Since version 2.5.0.2. It's UDP based, an experimental feature and only supported by other Azureus clients.
15. Has its own DHT, a mainline-DHT compatible implementation is available as plugin.
16. 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.
17. Called "preview mode"
18. Does not support HTTP redirection (status codes: 301, 302, 303, 307).
19. Does not support HTTPS.
20. Only available in Pro and web version
21. Only available in Pro and web version.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.
27. Support only base path ("url-list" path) redirection (message: "HTTP redirect does not match file path").
28. Adds HTTP referer header in request on HTTP redirection (useful behavior).
29. Provides a Java-based and a simple HTML/JS based WebUI.

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
BitTorrent	0	0	0	0	0	0
BitTorrent DNA	0	0	0	0	0	0
Deluge	0	0	0	0	0	0
FlashGet	0	0	0	0	0	1 13 August 2008 (2008-08-13)
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 (2008-02-26)
MLDonkey	0	0	0	0	1 5 November 2003 (2003-11-05)	1 23 February 2009 (2009-02-23)
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
Transmission	0	0	0	0	0	0
Vuze (formerly Azureus)	0	0	0	0	0	1 22 June 2006 (2006-06-22)
Xunlei	0	2 28 September 2007 (2007-09-28)	0	0	0	1 17 November 2007 (2007-11-17)
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 (2005-09-08)[82]	1.2.8[83] (August 4, 2020 (2020-08-04)) [±]	BSD licenses
MonoTorrent	September 2006 (2006-09)	1.0.23 (July 7, 2020 (2020-07-07)) [±]	MIT/X11
rTorrent (libTorrent Rakshasa)	15 July 2004 (2004-07-15)[84]	rTorrent 0.9.8 / libTorrent 0.13.8 (July 19, 2019 (2019-07-19)) [±][85]	GNU GPLv2
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[86]	Yes	Yes	Yes[87]
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]	WebTorrent	Broadcatching (RSS)	Prioritization	Selective downloads	SOCKS	Remote control via web	Engine	Notes
libtorrent (Rasterbar)	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	?
MonoTorrent	Yes	Yes	No	Yes	Yes	Yes	No	Yes	No
rTorrent (libTorrent Rakshasa)	Partial	No	No	No	Yes	Yes	No	Yes	No	No built-in cache-disk cache but a delayed sync
BitTorrent library	Cache	Web seeding	WebTorrent	Broadcatching (RSS)	Prioritization	Selective downloads	SOCKS	Remote control via web	Engine	Notes

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

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

References

1. "Glossary". BitTorrent User Manual. San Francisco: BitTorrent, Inc. Retrieved 2 July 2013.
2. Cohen, Bram (2 July 2001). "BitTorrent – a new P2P app". Decentralization · Implications of the end-to-end principle. Yahoo! Groups. Retrieved 2 July 2013.
3. Van Der Sar, Ernesto (14 October 2013). "Google-backed BitTorrent client spread malware to Windows PCs and Android devices". TorrentFreak. Retrieved 19 November 2013.
4. Gibbs, Samuel (15 October 2013). "Google-Backed File-Sharing Service Spreads Malware". The Guardian. Guardian News and Media. Retrieved 19 November 2013.
5. "BitComet Changelog". www.bitcomet.com. 4 November 2019. Retrieved 15 November 2019.
6. "Download BitTorrent: Windows". bittorrent.com. Retrieved 27 September 2017.
7. "Download BitTorrent: Mac". bittorrent.com. Retrieved 27 September 2017.
8. "BitTorrent®- Torrent Downloads - Apps on Google Play". Google Play.
9. "BitTorrent®- Torrent Downloads APKs - APKMirror". APKMirror. Illogical Robot LLC.
10. "FlashGet 3.7.0.1220 International, revised version released". FlashGet. 17 May 2013. Archived from the original on 11 May 2015.
11. "RSS feed for updates". 10 June 2020.
12. "KDE Ships KDE Applications and Platform 4.14.3". KDE. 11 November 2014. Retrieved 13 November 2015.
13. Štikonas, Andrius (6 June 2020). "KTorrent 5.2.0". kde-announce-apps (Mailing list). Retrieved 10 June 2020.
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