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Resilio Sync

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Resilio Sync
Original author(s)Konstantin Lissounov
Developer(s)Resilio, Inc.
Stable release[1] / 28 March 2022; 2 years ago (2022-03-28)
Operating systemWindows NT, macOS, Linux, FreeBSD, Android, iOS, Windows Phone, Fire OS
Available in13 languages
List of languages
English, German, French, Spanish, Italian, Japanese, Korean, Portuguese, Brazilian Portuguese, Russian, Chinese, Turkish, Dutch, Indonesian
TypeFile Synchronization

Resilio Sync (formerly BitTorrent Sync) by Resilio, Inc. is a proprietary peer-to-peer file synchronization tool available for Windows, Mac, Linux, Android, iOS, Windows Phone, Amazon Kindle Fire and BSD. It can sync files between devices on a local network, or between remote devices over the Internet via a modified version of the BitTorrent protocol.

Although not touted by the developers as an intended direct replacement nor competitor to cloud-based file synchronization services, it has attained much of its publicity in this potential role.[2]


On 24 January 2013, BitTorrent, Inc. announced a call for pre-alpha testers to help test a new "distributed syncing product to help manage personal files between multiple computers".[3]

Several private pre-alpha builds of "SyncApp" were subsequently made available to a limited group of alpha testers between January 2013 and April 2013. In mid-April 2013, the name "SyncApp" was dropped in favor of "BitTorrent Sync".[citation needed]

On 23 April 2013, the previously private "alpha" was opened up to general users.[2][4][5]

As of 6 May 2013, more than a petabyte of anonymous data had been synced between users, with over 70 terabytes synced daily.[6]

As of 16 July 2013, more than eight petabytes of data had been synced using the software.[7]

On 17 July 2013, BitTorrent Sync migrated from "alpha" to "beta", released an Android app, and introduced versioning.[8]

On 27 August 2013, BitTorrent Sync for iOS was announced.[9]

On 5 November 2013, BitTorrent announced the release of BitTorrent Sync Beta API and version 1.2 of the client, along with the milestone, having over 1 million monthly active users synced over 30 petabytes of data to date.[10]

As of 26 August 2014, there have been more than 10 million user installs and more than 80 petabytes of data synced between users.[11]

On 3 March 2015, the product finally exited beta as a commercial product, with the inclusion of a paid Pro version.[12]

On 9 September 2015, with the release of Sync 2.2, in the free version, the 10 folder limit that had been introduced in 2.0 was removed.[13]

On 21 January 2016, the release of Sync 2.3 introduced the Encrypted Folder,[14] as well as the ability to run as a Windows Service, to use SD cards on Android and, for paid users, Selective Sync support in Linux.[15]

On 1 June 2016, product and team were spun out of BitTorrent Inc. as an independent company, Resilio Inc. which will continue development of the product under the name Resilio Sync.[16][17] Former Bittorrent CEO Eric Klinker became the head of the new company.[18][19]


Resilio Sync synchronizes files using BitTorrent.[20] The user's data is stored on the user's local device instead of in a "cloud", therefore requiring at least two user devices, or "nodes," to be online to synchronize files between them. Resilio Sync encrypts data with an Advanced Encryption Standard AES-128 key in counter mode which may either be randomly generated or set by the user. This key is derived from a "secret" which can be shared to other users to share data. Data is sent between devices directly unless the target device is unreachable (e.g. behind a firewall), in which case the data will first be relayed via an intermediary node. Many devices can be connected simultaneously and files shared between them in a mesh networking topology.

There is no limit on the amount of data that can be synced, other than the available free space on each device.[21]


Current builds of Resilio Sync are available for the following operating systems:

See also[edit]


  1. ^ "Resilio Sync change log". Retrieved 13 March 2024.
  2. ^ a b "BitTorrent Sync challenges cloud-based file management". BBC News. 24 April 2013. Retrieved 24 April 2013.
  3. ^ "Test BitTorrent Sync Pre-Alpha". Archived from the original on 27 January 2013. Retrieved 1 January 2013.
  4. ^ "BitTorrent Sync Alpha Now Open To All". Archived from the original on 7 August 2014. Retrieved 23 April 2013.
  5. ^ "Forget online drives, sync directly with BitTorrent Sync". CNET. Retrieved 7 June 2021.
  6. ^ "BitTorrent Sync Crosses One Petabyte Milestone". Archived from the original on 8 July 2013. Retrieved 6 May 2013.
  7. ^ "Behind the Scenes: The Making of BitTorrent Sync". Archived from the original on 19 July 2013. Retrieved 17 July 2013.
  8. ^ "Now in Beta: BitTorrent Sync". Archived from the original on 19 July 2013. Retrieved 17 July 2013.
  9. ^ "BitTorrent Sync for iOS: Available Now". Archived from the original on 9 November 2013. Retrieved 28 August 2013.
  10. ^ Protalinski, Emil. 5 November 2013 TheNextWeb. "With over 1 million users and 30PB synced, BitTorrent speeds up Sync, adds iPad support, and debuts an API"
  11. ^ "Introducing BitTorrent Sync 1.4: An Easier Way to Share Large Files". 26 August 2014. Retrieved 7 June 2021.
  12. ^ "Sync 2.0: Skip The Cloud, Share Direct". Archived from the original on 15 March 2015. Retrieved 3 March 2015.
  13. ^ "Sync 2.2 Now Available". 9 September 2015.
  14. ^ "Understanding the Sync Encrypted Folder". 21 January 2016.
  15. ^ "Sync 2.3 Brings More Features For Power Users". Archived from the original on 9 March 2021.
  16. ^ "Important News about Sync".
  17. ^ Roettgers, Janko (2 June 2016). "BitTorrent Spins Off Sync App Into Separate Company to Focus on Media (EXCLUSIVE)". Variety. Retrieved 10 June 2016.
  18. ^ Mlot, Stephanie (20 June 2016). "BitTorrent Sync Now a Separate, Enterprise-Focused Biz". PCMag. Retrieved 7 June 2021.
  19. ^ "Remains of the Day: BitTorrent Sync Will Soon be Called Resilio Connect". 3 June 2016.
  20. ^ "BitTorrent Sync technology". Archived from the original on 30 August 2013. Retrieved 29 August 2013.
  21. ^ Sync BitTorrent, Inc. "BitTorrent Sync". bittorrent.com. Retrieved 9 May 2015.
  22. ^ "BitTorrent Sync Packages and GUI". Archived from the original on 2 May 2014. Retrieved 12 December 2013.
  23. ^ "Debian and Ubuntu Desktop GUI Packages for BitTorrent Sync". Archived from the original on 13 March 2014. Retrieved 13 March 2014.
  24. ^ "Debian and Ubuntu Server Packages for BitTorrent Sync". Archived from the original on 5 December 2013. Retrieved 12 December 2013.
  25. ^ "Supported Platforms".
  26. ^ "BitTorrent Sync: Android apps on Google Play".
  27. ^ "BitTorrent Sync: Appstore for Android". Amazon.
  28. ^ "BitTorrent Sync on the App Store on iTunes". iTunes.
  29. ^ "BitTorrent Sync 1.3 now supporting Windows Phone".
  30. ^ "BitTorrent Sync: Windows Phone Apps".

External links[edit]