Blink (SIP client)

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Logo of Blink
Developer(s)AG Projects
Initial releaseDecember 1, 2009 (2009-12-01)
Stable release
Pro 4.5.1 (October 15, 2016; 4 years ago (2016-10-15)) [±][1]
 Blink for Windows 3.2.0 (February 27, 2019; 2 years ago (2019-02-27)) [±][2]
 Blink for Linux 3.2.2 (March 19, 2020; 16 months ago (2020-03-19)) [±][3]
Written inPython
Operating systemMac OS X, Microsoft Windows and Linux
Size30M Cocoa version
20M Qt version
Available inEnglish
LicenseBlink License (free software versions + Shareware versions)[4]

Blink is a Session Initiation Protocol (SIP) client distributed under the Blink license (GNU GPLv3 with an exception to permit the inclusion of commercial proprietary modules).[4][5]

The software is written in Python for macOS's Cocoa, with a later port to Qt for supporting Microsoft Windows and Linux.


Blink is based on the Session Initiation Protocol, and beyond voice over IP, its features also include video, instant messaging, file transfer and multi-party conferencing sessions based on MSRP protocol, remote desktop sharing using RFB protocol (VNC), and SIMPLE presence using XCAP protocol.

Privacy and Security[edit]

The Linux and Mac OS X version of Blink implement OTR protocol end-to-end encryption and peer verification for chat media.[6] All versions provide audio and video media encryption using ZRTP.


  1. ^ "ChangeLog for Blink Pro (MacOSX version)".
  2. ^ "ChangeLog for Blink for Windows)".
  3. ^ "ChangeLog for Blink (Linux)".
  4. ^ a b "Help for Blink Pro and Blink Lite for OSX".
  5. ^ "Download Blink". Blink Project's Website. Retrieved 22 June 2016.

External links[edit]