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Open Source Slack Alternatives
The best open source alternative to Slack is Element. It's not free, so if you're looking for a free alternative, you could try Element or Zulip. If that doesn't suit you, our users have ranked more than 100 alternatives to Slack and loads of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Slack are Matrix, Wire, Stoat Chat and Threema.
filter to find the best alternatives
Slack alternatives are mainly Group Chat Apps, but if you're looking for Instant Messengers or Video Calling Apps you can filter on that. Other popular filters include Open Source, Self-Hosted, Self-Hosted + Open Source and Free. You can also filter by region, for example EU-based alternatives if you prefer software developed in the European Union. These are just examples - use the filter bar below to find more specific alternatives to Slack.
Alternatives list
242 Conduit Chat Server alternativesConduit is a simple, fast and reliable chat server powered by Matrix. Conduit is an alternative to Synapse and tries to be lightweight and easy to install, but it is still in development.
Cost / License
- Free
- Open Source (Apache-2.0)
Application type
Platforms
- Online
- Self-Hosted
- Raspberry Pi
- Linux
- Debian
- Nix Package Manager
- Docker
- Docker Hub
Awesome hosting for Matrix chat and integrations - built on the Matrix open ecosystem for secure, decentralised communication, by the creators of Matrix.
Cost / License
- Free
- Open Source (GPL-3.0)
Application types
Platforms
- Mac
- Windows
- Linux
- Android
- KDE
- Matrix.org
- Flathub
+4
Cost / License
- Free
- Open Source
Application types
Platforms
- Android
- F-Droid
+5
monocles chat is a fork of blabber.im and Conversations with some changes, to improve usability.
+5
100 PrivMX Fusion alternativesPrivMX Fusion is safe and easy collaboration software for all kinds of teams, with virtual workspace protected by end-to-end encryption. Each team uses desktop/laptop client software and its own (zero-knowledge) PrivMX Team Server.
Cost / License
- Freemium
- Open Source
Application types
Alerts
- Discontinued
Platforms
- Mac
- Windows
- Linux
- Self-Hosted
- Software as a Service (SaaS)
+9
Kahla is a free and open-source, cross-platform business messaging tool that supports end-to-end encrypted message communication and automatic destruction of messages.
Cost / License
- Free
- Open Source
Application types
Platforms
- Mac
- Windows
- Linux
- Online
- Android
- Chrome OS
- Android Tablet
- Self-Hosted
hack.chat is a minimal, distraction-free chat application. Channels are created and joined by going to https://hack.chat/?your-channel. There are no channel lists, so a secret channel name can be used for private discussions.
Source code : https://github.com/hack-chat/main.
Cost / License
- Free
- Open Source
Platforms
- Online
- Android
- Self-Hosted
Pensil is a community building platform that brings together members, engaging discussion & live events for brands and creators.
Cost / License
- Freemium
- Open Source
Application types
Platforms
- Online
- Android
- iPhone
- Android Tablet
- iPad
- Self-Hosted
- Google Chrome
- Software as a Service (SaaS)
+2
Cost / License
- Free
- Open Source
Application type
Alerts
- Discontinued
Platforms
- Self-Hosted
Mostlymatter is a fork of Mattermost meant to remove the users and messages limits. Mattermost is an open source platform for secure collaboration across the entire software development lifecycle.
United Kingdom
Germany
EU
Poland
India
