Overview

What is Psi?

Psi is the premiere Instant Messaging application designed for Microsoft Windows, Apple Mac OS X and GNU/Linux.

In depth

A closer look at Psi

Built upon an open protocol named Jabber, Psi is a fast and lightweight messaging client that utilises the best in open source technologies. Psi contains all the features necessary to chat, with no bloated extras that slow your computer down.

PSI 1.4

There have been many instant messaging applications recently with this application being one such example.

psi is a free im application for windows and mac that lets you talk with your messenger contacts in a way that's simple and quick. It does not consume a lot of resources and has a design that's both simple and stylish.

it's based on jabber, which means you can talk with any contact who has an account with this open protocol, like gmail users, for example. Other contacts from networks like windows live thanks to its transfer support can also be added. The psi application is a great application that you're sure to enjoy trying.

Verdict

Should you download Psi?

Psi runs on Windows 9X/ME/2K/XP/2003 and is available under the Freeware license — the installer is 2.93 MB. We’ve catalogued it under Faxing and Communication.

Verified clean. Every Psi build on SoftLookup is scanned for viruses, spyware, adware, trojans and backdoors. We re-test on every update.

Psi specifications

Category: Faxing and Communication
Publisher: Psi Programmers
Last updated: Nov 20, 2025
License: Freeware
Operating system: Windows 9X/ME/2K/XP/2003
File size: 2.93 MB
Price: Free
Page views: 468

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Psi0.9.0

What is Psi?

A closer look at Psi

PSI 1.4

Should you download Psi?

Psi specifications

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