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Simple repository to test BYOS alternatives to Slack.
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Slack Alternatives

So slack is costly, centralized and way too necessary for your organization. Maybe you want to move to an open source alternative or you want to make sure your super important info is not being read by 3rd parties. This repository contains some docker-compose files so you can try some of the open-source alternatives to Slack.


Some bullet-points about licenses/costs of each solution:

# Chat AD Integration Extensible Documentation Tech License Mobile Cost
1 Rocket.Chat Yes Good JS/Meteor MIT Free/BYOS
1 Mattermost AD/LDAP Good Golang-React MIT Free/BYOS
2 Zulip YES Ok Python Apache License 2.0 Free/BYOS
2 MS Teams YES Good N/A Commercial Depends
2 Gitter Not Clear with API Good N/A Commercial SaaS
2 Flowdock Not Clear Good N/A Commercial SaaS
4 Matrix No Not Clear Ok Node.js MIT No Free/BYOS
4 Wire No Not Clear Insufficient N/A GNU AFFERO SaaS/OS
5 Let's Chat YES X Minimum Node.js MIT No Free/BYOS

Testing Some Options:

To test yourself the options just call the command in the repository. docker-compose is required!

docker-compose -f rocketchat.yml up # Available at: localhost:3000
docker-compose -f mattermost.yml up # Available at: localhost:8065
docker-compose -f letschat.yml up   # Available at: localhost:8080

Options without demos:

  • zulip
  • matrix

Rocket Chat

SaaS and self-hosted chat service written in NodeJS. Plugins for Pidgin/Drupal available but also iOS/Android/Desktop.

Provides Webhook support, but also Hubot and other integrations like Google Calendar and Zapier.


Canonical, SteadyMD, Lisk, AEB (Brazilian Space Agency), Southeastern


SaaS with self-hosted "Team" option that is free. Is written in Golang, and works through a fremium model. AD integration is part of their "Enterprise" package at 39/user/year.

They have over 131 integrations including Hubot and Zapier.

Mobile(iOS & Android) Desktop (Linux, Windows, Mac) clients available

For administration, they support a CLI

There's an experimental feature for default channels a user should be added to:


Samsung, Virgin, DOD, Bristol-Myers Squibb, SAS, CERN


Python open source group chat application with real-time chat and threaded conversations. All installation is around Ubuntu.

It's extensible and provides over 90 native integrations Including IFTTT/Zapier/Hubot.

They have a Mobile App written in React-Native for both Android and iOS


Akamai, dr on demand, LevelUp, RecurseCenter, Panjiva, Layershift, SolanoLabs, Veelo

Microsoft Teams

Microsoft's solution for real-time collaboration including chat and video-conferencing.

Many apps are provided including Hubot and others

Clients for iOS/Android Desktop Windows and OSX provided.

Pricing oscillates between 8USD/month and 35usd/month. But there are other plans and it migth be already included with Office 365. Special prices for education orgs apply



Communication service focused on security. It's cost is as low as 4USD/USER/Month and although they have their Backend Open-Sourced there's no documentation on how to run it.

It provides Mobile apps for Android/iOS/Linux/Windows/Browser. The clients are also Open Source.

There are no extensions available.




Commercial Chat solution with clients for iOS, Linux, Mac, Windows.

It has a SaaS business model with the low price of 5usd/user. But also offers a free plan.

There are [some integrations available])(


Airbnb, AWS, Google, Microsoft, Mozilla Science Lab, Rails, Scala and more


Commercial communication solution from CA with clients for OSX, iOS, Android and Windows.

Provides integration with other third party apps.

The cost is as low as 3/USD/USER/Month



Let's Chat

NodeJS MIT licensed chat. Focused on small groups and with basic integrations for Hubot and authentications services like Kerberos, LDAP. The project is not actively developed nor maintained

There isn't a native application for iOS nor Android. Only browser support.




Matrix is a network for descentralized communication. It specifies a set of RESTful HTTP JSON APIs as an open standard and different clients support such specification. One of the clients is the Riot.IM messaging


Mozilla, Ericsson, Amdocs, Deutsche Telekom, Thales


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