Slack AlternativesOnly Open Source apps categorised as Video Calling 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 iconSlack
  851
  • ...

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
  1. Element icon
     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
    Video calls for desktop and mobile

    License model

    • FreemiumOpen Source

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Self-Hosted
    • Matrix.org
    • Flathub
    • F-Droid
    • Cloudron

    Properties

    1.  Decentralized
    2.  Privacy focused

    Features

    1.  End-to-End Encryption
    2.  Federated
    3.  Team Collaboration
    4.  Encrypted Chat
    5.  Video Calling
    6.  Instant Messaging
    7.  Matrix Protocol
    8.  Voice Chat
    9.  Direct Messaging
    10.  Federation
    11.  Simple installation
    12.  Cross-Platform
    13.  Dark Mode
    14.  Custom widgets
    15.  VoiP Calls
    Element iconSlack Icon

    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 commentDec 5, 2021
    2
    Dserver Hosting

    this is a open source and free software that is very useful for me

    Positive commentDec 20, 2022
    1
    kaspian

    Encrypted, free, open-source, decentralized

    Positive commentSep 28, 2022
    0
    Show more comments
    3 of 12 comments
    Slack Icon
    Element icon
    • 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
  2. Rocket.Chat icon
     152 likes

    Rocket.Chat is a Web Chat Server, developed in JavaScript, using the Meteor fullstack framework.

    136 Rocket.Chat alternatives
    Rocket.Chat screenshot 1

    License model

    • FreemiumOpen Source

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • iPad
    • Self-Hosted
    • Cloudron

    Properties

    1.  Ad-free
    2.  Extensible by Plugins/Extensions

    Features

    1.  Omnichannel messaging
    2.  Channels
    3.  Self-Serve Capability
    4.  Telegram integration
    5.  Whatsapp integration
    6.  Bots
    7.  End-to-End Encryption
    8.  Screen Sharing
    9.  Integrated File Sharing
    10.  Video Conferencing
    11.  Chat Bot
    12.  Slack integration
    Rocket.Chat iconSlack Icon

    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 commentDec 26, 2016
    10
    Guest

    Rocket.Chat comes very close to slack regarding it's core features and handling.

    Positive commentJun 17, 2018
    7
    Guest

    open source, locally hosted so you own your data.

    Positive commentNov 29, 2018
    2
    Slack Icon
    Rocket.Chat icon
    • Almost everyone thinks Rocket.Chat is a great Slack alternative.

    • Rocket.Chat is Freemium and Open SourceSlack is Freemium and Proprietary
  3. Wire icon
     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
    Wire screenshot 1
    Wire screenshot 2
    +2
    Wire screenshot 3

    License model

    • Free PersonalOpen Source

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Self-Hosted
    • F-Droid
    • Software as a Service (SaaS)

    Properties

    1.  Security-focused
    2.  Privacy focused

    Features

    1.  End-to-End Encryption
    2.  Video Calling
    3.  Encrypted Chat
    4.  VoiP Calls
    5.  Encrypted calls
    6.  Screen Sharing
    7.  Multiple Account support
    8.  WebRTC
    9.  Secure File Sharing
    10.  Voice Chat
    11.  Voice messages
    Wire iconSlack Icon

    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
  4. Threema icon
     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
    Threema screenshot 1
    Threema screenshot 2
    +5
    Threema screenshot 3

    License model

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Android Tablet
    • HUAWEI AppGallery
    • iPad

    Properties

    1.  Privacy focused
    2.  Ad-free
    3.  No Tracking

    Features

    1.  End-to-End Encryption
    2.  Encrypted Chat
    3.  Integrated File Sharing
    4.  Confirm messages
    5.  Image Sharing
    6.  Encrypted calls
    7.  Cloud Sync
    8.  Encrypted Backup
    9.  Dark Mode
    10.  Multiple Account support
    11.  Two-factor Authentication
    12.  Voting
    13.  Secure Chat
    14.  Multiple languages
    15.  Integrated App lock
    16.  Encrypted Email
    Threema iconSlack Icon

    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
  5. Element X icon
     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
    Element X screenshot 1
    Element X screenshot 2
    +1
    Element X screenshot 3

    License model

    • FreeOpen Source

    Platforms

    • Android
    • iPhone
    • Android Tablet
    • iPad

    Properties

    1.  Ad-free
    2.  Privacy focused
    3.  Decentralized
    4.  Lightweight
    5.  No Tracking

    Features

    1.  VoiP Calls
    2.  Matrix Protocol
    3.  End-to-End Encryption
    4.  Dark Mode
    5.  Voice Chat
    Element X iconSlack Icon

    Element X VS Slack

    Is Element X a good alternative to Slack?
     
  6. Nextcloud Talk icon
     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
    Nextcloud Talk screenshot 1

    License model

    • Free PersonalOpen Source

    Platforms

    • Online
    • Android
    • iPhone
    • iPad
    • Self-Hosted
    • Nextcloud

    Properties

    1.  Privacy focused
    2.  Ad-free
    3.  No registration required
    4.  No Tracking

    Features

    1.  Screen Sharing
    2.  End-to-End Encryption
    3.  Real time collaboration
    Nextcloud Talk iconSlack Icon

    Nextcloud Talk VS Slack

    Is Nextcloud Talk a good alternative to Slack?
     
  7. Mirotalk icon
     14 likes

    Powered by WebRTC, Real-time video call, chat room and screen sharing entirely browser based.

    55 Mirotalk alternatives
    Mirotalk screenshot 1

    License model

    • FreeOpen Source

    Platforms

    • Online
    • Self-Hosted

    Properties

    1.  Privacy focused
    2.  No Tracking
    3.  Ad-free
    4.  No registration required

    Features

    1.  Screen Sharing
    2.  Desktop Sharing
    3.  Dark Mode
    4.  End-to-End Encryption
    5.  Real time collaboration
    6.  VoiP Calls
    7.  Multiple Account support
    8.  Voice Chat
    Mirotalk iconSlack Icon

    Mirotalk VS Slack

    Is Mirotalk a good alternative to Slack?
     
7 of 13 Slack alternatives