Software · Internet & communication

Quassel Client

Quassel Client is a messaging program, available on Linux.

Completely free
Linux
Open source

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Geographic availability: No geographic restriction found in our sources; availability is not checked country by country.

Technical details

Pricing: Completely freeconfirmed by Flathub
License: GPL-2.0 / GPL-3.0 — Open source (copyleft)confirmed by Flathub
Open source: Yes
Commercial use: Yesconfirmed by Official plan pages (pricing, licence, terms), Flathub
Account required: not documented
Credit card required: Noconfirmed by Flathub
Watermark: Not applicable
Ads: not documented
Platforms: LinuxEstablished by Linux: Flathub
Publisher: The Quassel IRC Team
Latest version: 0.14.0 (1 January 2022)
Latest activity: 26 April 2026
Source code: github.com/quassel/quassel

At a glance

All of Quassel Client is free: no feature is locked behind a paid plan, and its code is open.

Its licence (GPL-2.0 / GPL-3.0) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

Open source code
Commercial use allowed

About

Quassel IRC is a modern, cross-platform, distributed IRC client based on the Qt framework. Distributed means that one (or multiple) client(s) can attach to and detach from a central core that stays permanently online -- much like the popular combination of screen and a text-based IRC client such as WeeChat, and similar to (but much more featureful than) so-called BNCs. Re-attaching your client will show your IRC session in the same state as you left it in (plus whatever happened while you were gone), and this even when you re-attach from a different location. In addition, Quassel IRC can be used like a traditional client, with providing both client and core functionality in one binary. This so-called "Monolithic Client" completely hides the distributed nature, so for a purely local installation, Quassel IRC can be setup very easily. Cross-platform means that Quassel IRC is developed for and tested on Linux®, Windows®, and MacOS X®. It should also run on any other platform that is supported by the Qt library. Third-party mobile clients for Android and iOS also exist. By modern we mean that Quassel IRC will have all the features you'd expect from an IRC client nowadays. It also innovates in many areas. For example, the GUI features a dockable nicklist and topic bar, or you can arrange your channel and query buffers in default or custom views, which are also dockable. This means that you can arrange your GUI as you please. The architecture allows for other innovations, such as on-demand creation of log files in custom formats from the backlog.

Description from Flathub — AppStream (Flathub)

Sources and checks

Facts collected from Official plan pages (pricing, licence, terms) (commercial use) — 10 November 2026
Facts collected from Flathub (credit card, source code, publisher, licence, free status, platforms, commercial use, version) — 10 November 2026
Last technical check: 8 November 2026
Description from Flathub — AppStream (Flathub)

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