Open Source Self-Hosted Slack Alternatives

Slack is not available as a self-hosted solution but there are plenty of alternatives for power users and business that want to host a solution on-premise. The best open source Self-Hosted alternative is Mattermost. If that doesn't suit you, our users have ranked more than 100 alternatives to Slack and many of them are open source and available as a self-hosted solution so hopefully you can find a suitable replacement. Other interesting open source Self-Hosted alternatives to Slack are Element, Zulip, Rocket.Chat and Matrix.org.

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Slack alternatives are mainly Group Chat Apps but may also be Instant Messengers or Encrypted Chat Apps. Other popular filters includes Self-Hosted + Open Source. Filter by these or use the filter bar below if you want a narrower list of alternatives or looking for a specific functionality of Slack.

Slack

851

Group Chat App
Freemium • Proprietary

Slack is a unified communication platform built with an optimized workflow to keep modern teams focused and productive. A familiar chat interface facilitates discussions while advanced features are easily exposed based on...

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Slack alternatives page was last updated Apr 18, 2023

dirc
Dirc is a peer-to-peer web application which uses WebRTC to set up connections between chat participants without requiring a back-end server. The static files can be self-hosted. Other features:
41 dirc alternatives
License model
- Free • Open Source
Application types
- Group Chat App
- Team Collaboration Tool
Platforms
- Mac
- Windows
- Linux
- Online
- Android
- iPhone
- Chrome OS
- Self-Hosted
dirc Features
No registration required
IRC
Show all NaN dirc features ▾
dirc VS Slack
Is dirc a good alternative to Slack?

Hack Chat
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 ...
42 Hack Chat alternatives
License model
- Free • Open Source
Platforms
- Online
- Android
- Self-Hosted
Hack Chat Features
Distraction-free
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Hack Chat VS Slack
Is Hack Chat a good alternative to Slack?

Databag
A tiny self-hosted federated messenger for the decentralized web.
8 Databag alternatives
License model
- Free • Open Source
Application types
- Instant Messenger
- Group Chat App
Platforms
- Android
- iPhone
- Android Tablet
- iPad
- Self-Hosted
- F-Droid
Databag Features
1. Lightweight
2. End-to-End Encryption
3. Privacy focused
4. Ad-free
5. Decentralized
6. No Tracking
7. AES-256 Encryption
8. VoiP Calls
9. Federated
Show all NaN Databag features ▾
Databag VS Slack
Is Databag a good alternative to Slack?

ZeroChat
An IRC-like internet chatroom hosted on ZeroNet, a distributed network. 0rc is a fully distributed website, and messages are shared through peers using the ZeroNet stack. In addition, making a new chatroom website is a ...
90 ZeroChat alternatives
License model
- Free • Open Source
Platforms
- Mac
- Windows
- Linux
- Online
- Self-Hosted
- Python
- JavaScript
- ZeroNet
ZeroChat Features
Decentralized
Distributed
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Discontinued
Last update on github made over 5 years (March 13, 2016).
ZeroChat VS Slack
Is ZeroChat a good alternative to Slack?

Total.js Messenger
Total.js Messenger is a small alternative to Slack built on Node.js and total.js .
22 Total.js Messenger alternatives
License model
- Freemium • Open Source
Application types
- Team Collaboration Tool
- Instant Messenger
Platforms
- Self-Hosted
- Node.JS
Total.js Messenger VS Slack
Is Total.js Messenger a good alternative to Slack?

PrivMX Fusion
PrivMX 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 ...
104 PrivMX Fusion alternatives
License model
- Freemium • Open Source
Application types
- Group Chat App
- Team Collaboration Tool
Platforms
- Mac
- Windows
- Linux
- Self-Hosted
- Software as a Service (SaaS)
+9
Top PrivMX Fusion Features
1. No Tracking
2. End-to-End Encryption
3. Kanban Board
4. AES-256 Encryption
5. VoiP Calls
6. Decentralized
7. Block Trackers
8. Two-factor Authentication
9. Team work
10. Task Scheduling
11. Task Tracking
12. Share screenshots
Show all NaN PrivMX Fusion features ▾
PrivMX Fusion VS Slack
Is PrivMX Fusion a good alternative to Slack?

Fugu Simple Work Chat
Simple yet powerful open source slack alternative chat platform for teams and organizational communication. Keep your conversations in your control, free from data mining and ads. Safe from prying eyes and secured with ...
97 Fugu Simple Work Chat alternatives
License model
- Free • Open Source
Application types
- Group Chat App
- Team Collaboration Tool
Platforms
- Online
- Android
- iPhone
- Android Tablet
- iPad
- Self-Hosted
Fugu Simple Work Chat Features
1. Privacy focused
2. Secure Chat
3. Attendance management
4. Omnichannel messaging
5. Microsoft Teams Integration
6. Team Messaging
Show all NaN Fugu Simple Work Chat features ▾
Fugu Simple Work Chat VS Slack
Is this a good alternative to Slack?