Slack AlternativesOnly Open Source apps categorised as Video Calling & Group Chat Apps

If that doesn't work for you, our users have ranked more than 100 alternatives to Slack, but unfortunately only zero of them are open source Video Calling Apps. If you can't find an alternative you can try to remove all filters.

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Slack alternatives are mainly Instant Messengers but may also be Group Chat Apps or Video Calling 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

Facilitates teams' real-time collaboration with versatile chat interface and advanced search in configurable channels across multiple platforms.

More about Slack

Slack alternatives page was last updated Sep 18, 2024

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Element
691 likes
Element is a secure collaboration and messaging app based on the Matrix protocol. It’s decentralised to deliver digital sovereignty, and based on an open standard for easy connections and interoperability. It is end-to-end encrypted by default.
293 Element alternatives
License model
Freemium • Open Source
Application types
Instant Messenger
Video Calling App
Platforms
Mac
Windows
Linux
Online
Android
iPhone
Android Tablet
iPad
Self-Hosted
Matrix.org
Flathub
F-Droid
Cloudron
+1
Properties
Decentralized
Privacy focused
Features
End-to-End Encryption
Federated
Team Collaboration
Encrypted Chat
Video Calling
Instant Messaging
Matrix Protocol
Voice Chat
Direct Messaging
Federation
Simple installation
Cross-Platform
Dark Mode
Custom widgets
VoiP Calls
Element VS Slack
Is Element a good alternative to Slack?
Comments about Element as an Alternative to Slack

Comment summary: Element is praised for being free, open-source, and decentralized, with strong privacy due to its encryption and adherence to the Matrix protocol. It offers federated communication, interoperability, and allows end-to-end encrypted messaging, enhancing user security and flexibility. Users appreciate its ability to bridge into other networks and its performance in team communication.
Tommi
It is decentralized and it works with an open standard
Top positive comment •Dec 5, 2021
2
Dserver Hosting
this is a open source and free software that is very useful for me
Positive comment •Dec 20, 2022
1
kaspian
Encrypted, free, open-source, decentralized
Positive comment •Sep 28, 2022
0
Show more comments
3 of 12 comments
- Almost everyone thinks Element is a great Slack alternative.
- Element is the most popular Web-based, Windows, Android & Mac alternative to Slack.
- Element is the most popular Open Source & free alternative to Slack.
- Element is Freemium and Open SourceSlack is Freemium and Proprietary
- Element is Decentralized and Privacy focusedSlack is not according to our users

Rocket.Chat
152 likes
Rocket.Chat is a Web Chat Server, developed in JavaScript, using the Meteor fullstack framework.
136 Rocket.Chat alternatives
License model
Freemium • Open Source
Application types
Group Chat App
Instant Messenger
Platforms
Mac
Windows
Linux
Android
iPhone
iPad
Self-Hosted
Cloudron
+5
Properties
Ad-free
Extensible by Plugins/Extensions
Features
Omnichannel messaging
Channels
Self-Serve Capability
Telegram integration
Whatsapp integration
Bots
End-to-End Encryption
Screen Sharing
Integrated File Sharing
Video Conferencing
Chat Bot
Slack integration
Rocket.Chat VS Slack
Is Rocket.Chat a good alternative to Slack?
Comments about Rocket.Chat as an Alternative to Slack

John Fastman
Does everything Slack does AND it's open source. However, it's also self-hosted. This means you have to put in the effort to set it up, but you control your own data, which is a huge advantage to your privacy - your chats and files don't sit on someone else's servers, ready for them or hackers to look at.
Positive comment •Dec 26, 2016
10
Guest
Rocket.Chat comes very close to slack regarding it's core features and handling.
Positive comment •Jun 17, 2018
7
Guest
open source, locally hosted so you own your data.
Positive comment •Nov 29, 2018
2
- Almost everyone thinks Rocket.Chat is a great Slack alternative.
- Rocket.Chat is Freemium and Open SourceSlack is Freemium and Proprietary

Wire
303 likes
Wire is the most secure collaboration platform featuring messenger, voice, video, conference calls, file-sharing, and external collaboration –all protected by the most secure end-to-end-encryption.
282 Wire alternatives
+2
License model
Free Personal • Open Source
Application types
Video Calling App
Instant Messenger
Platforms
Mac
Windows
Linux
Online
Android
iPhone
Android Tablet
iPad
Self-Hosted
F-Droid
Software as a Service (SaaS)
Properties
Security-focused
Privacy focused
Features
End-to-End Encryption
Video Calling
Encrypted Chat
VoiP Calls
Encrypted calls
Screen Sharing
Multiple Account support
WebRTC
Secure File Sharing
Voice Chat
Voice messages
Wire VS Slack
Is Wire a good alternative to Slack?
- Most users think Wire is a great Slack alternative.
- Wire is the most popular SaaS alternative to Slack.
- Wire is Free Personal and Open SourceSlack is Freemium and Proprietary
- Wire is Security-focused and Privacy focusedSlack is not according to our users

Threema
112 likes
Threema is a new mobile messaging app that puts security first. With true end-to-end encryption, you can rest assured that only you and the intended recipient can read your messages.
118 Threema alternatives
+5
License model
Paid • Open Source
Application types
Instant Messenger
Video Calling App
Platforms
Mac
Windows
Linux
Online
Android
iPhone
Android Tablet
HUAWEI AppGallery
iPad
Properties
Privacy focused
Ad-free
No Tracking
Features
End-to-End Encryption
Encrypted Chat
Integrated File Sharing
Confirm messages
Image Sharing
Encrypted calls
Cloud Sync
Encrypted Backup
Dark Mode
Multiple Account support
Two-factor Authentication
Voting
Secure Chat
Multiple languages
Integrated App lock
Encrypted Email
Threema VS Slack
Is Threema a good alternative to Slack?
- Threema is the most popular commercial alternative to Slack.
- Threema is Paid and Open SourceSlack is Freemium and Proprietary
- Threema is Privacy focusedSlack is not according to our users

Element X
20 likes
It is the brand new, and fastest ever, Matrix client. It is for personal and community use, and will support enterprise functionality later this year.
82 Element X alternatives
+1
License model
Free • Open Source
Application types
Instant Messenger
Video Calling App
Platforms
Android
iPhone
Android Tablet
iPad
Properties
Ad-free
Privacy focused
Decentralized
Lightweight
No Tracking
Features
VoiP Calls
Matrix Protocol
End-to-End Encryption
Dark Mode
Voice Chat
Element X VS Slack
Is Element X a good alternative to Slack?

Nextcloud Talk
32 likes
Nextcloud Talk is a fully self-hosted audio/video and chat communication service. It features web and mobile apps and is designed to offer the highest degree of security while being easy to use.
100 Nextcloud Talk alternatives
License model
Free Personal • Open Source
Application types
Video Calling App
Instant Messenger
Platforms
Online
Android
iPhone
iPad
Self-Hosted
Nextcloud
+5
Properties
Privacy focused
Ad-free
No registration required
No Tracking
Features
Screen Sharing
End-to-End Encryption
Real time collaboration
Nextcloud Talk VS Slack
Is Nextcloud Talk a good alternative to Slack?

Mirotalk
14 likes
Powered by WebRTC, Real-time video call, chat room and screen sharing entirely browser based.
55 Mirotalk alternatives
License model
Free • Open Source
Application types
Video Calling App
Instant Messenger
Platforms
Online
Self-Hosted
Properties
Privacy focused
No Tracking
Ad-free
No registration required
Features
Screen Sharing
Desktop Sharing
Dark Mode
End-to-End Encryption
Real time collaboration
VoiP Calls
Multiple Account support
Voice Chat
Mirotalk VS Slack
Is Mirotalk a good alternative to Slack?