Psi is an Open-source Free Messenger over XMPP Network

Psi is an Open-source Free Messenger over XMPP Network

Psi is a free instant messaging application designed for the XMPP network. Fast and lightweight, Psi is fully open-source and compatible with Windows, Linux, and macOS.

Psi's unrivaled Unicode support and localizations, seamless file transfers, customizable iconsets, and a myriad of other exceptional features will swiftly demonstrate why users globally are transitioning to free, open instant messaging.


  • Connects to the free, open XMPP network
  • Compatible with Windows, Linux, and macOS
  • Takes advantage of each operating system's unique features for a first-class IM experience
  • Fast and lightweight design
  • Localized versions available in almost twenty different languages
  • Built-in support for the Unicode international text standard
  • Highly customizable appearance
  • Option to customize toolbars, keyboard shortcuts, and other features
  • Automatically encrypts communication with compatible IM servers using SSL technology
  • Can encrypt messages end-to-end with OpenPGP, OMEMO, OTR for advanced security needs
  • Active involvement of developers in the XMPP community ensures full support for features like avatars, multi-user chats, remote client control, and more
  • Dozens of plugins and add ones


  • Windows
  • macOS
  • Linux


GNU General Public License version 2.0 (GPLv2)

Resources & Downloads

Download Psi+ for free. Psi+ Project — development branch of Psi XMPP client. Psi is a cross-platform powerful XMPP client designed for experienced users. Psi+ is a development branch of Psi XMPP client.