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Kosmos Chat is a service for chat rooms and instant messaging. The service is separate from the chat apps you can use with your account. With a Kosmos Chat account, in the form of, you can chat with people on thousands of different servers.


The service is based on XMPP[1][2] (also called Jabber when used for chat), meaning that most chat/messaging apps which support XMPP/Jabber will work with your account. Here are a few apps that we can recommend:


Conversations is a fantastic app, and currently the gold standard for XMPP chat on smartphones. It is easy to use, and supports modern end-to-end encryption between all your devices via OMEMO[3].

📦 Buy it on Google Play (supports development of this open-source app), or 📦 install it from F-Droid and consider a donation instead.

Play link for Conversations.png


Monal is a chat app for iOS, iPadOS, and macOS.

📦 Install it from the App Store

App Store link for Monal.png

Siskin IM is another option for iOS. It is made by the same people as Beagle IM, so if you use Beagle on a Mac, this option may work better for you.

📦 Install it from the App Store

App Store link for Siskin.png

Linux / BSD

Dino is a modern and simple chat app for Linux. Full support for OMEMO encryption, and easy to use.

📦 Get a package for your distribution


Beagle IM is a promising new chat app for macOS users. It's still a bit rough around the edges, but supports a lot of modern XMPP features.

📦 Install it from the App Store


Gajim is a full-featured chat app for Windows (also available on Linux and macOS). It has support for most modern XMPP features, including OMEMO encryption via an official plugin.

📦 Download it from the official website

How to connect

Usually, you only need your user address and password to configure your chat application.

Your user address is


For advanced users and/or troubleshooting:

C2S port
5222 (StartTLS), 5223 (TLS)
S2S port
Bosh URL
In-band Registration

Multi-user Chat (MUC)

The server is host to a variety of chat rooms. The server's MUC domain is Thus, room addresses look like Only local users (with a address) are currently allowed to create chat rooms on

Come talk to us in!

Tor hidden service

You can connect to the XMPP service directly from the Tor network. The configuration is the same as for clearnet, except for the server to connect to: