Slack AlternativesOnly Open Source apps categorised as Video Calling Apps

The best open source Video Calling 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 many of them are open source Video Calling Apps so hopefully you can find a suitable replacement. Other interesting open source Video Calling App alternatives to Slack are Threema, Element X, Mirotalk and Nextcloud Talk.

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Alternatives list

  1. Element icon

    Element

     766 likes
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    Provides secure collaboration with end-to-end encryption, supporting chat, voice, and video calls. Available on all major platforms, it enables digital sovereignty with a decentralized design and interoperability through bridges to systems like Slack and Teams. Includes enterprise-grade SaaS.

    301 Element alternatives

    Cost / License

    • Free Personal
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Self-Hosted
    • Matrix.org
    • Flathub
    • F-Droid
    • Cloudron
    • Snapcraft
    Video calls for desktop and mobile
     
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    13
    102
    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.
    Top Positive Comment
    brinerustle
    6

    because its open source, decentralised, and end-to-end secure. Plus the folks at matrix.org are working to get us out of our communication silos by creating standards for communication interoperability!

    Top Negative Comment
    davaga6837
    1

    Element is way too buggy and slow. It's actually totally free unlike the description which says it's not free. But, free isn't enough when the software is just buggy and slow.

    Dserver Hosting
    Positive
    1

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

    Review by a new / low-activity user.
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    3 of 13 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 Free Personal and Open SourceSlack is Freemium and Proprietary
    • Element is Privacy focused and LightweightSlack is not according to our users
  2. Zulip icon

    Zulip

     263 likes
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    Zulip is the only modern team chat app that is designed for both live and asynchronous conversations. Zulip topics create a separate space for each discussion, so different conversations will never get in each other's way.

    221 Zulip alternatives

    Cost / License

    • Free Personal
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Android Tablet
    • BSD
    • iPad
    • Self-Hosted
    • F-Droid
    Zulip screenshot 1
     
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    75
    213
    Comments about Zulip as an Alternative to Slack
    Comment summary: Zulip is praised for its open-source nature and unique threading model, which many users find superior to Slack's, especially for organizing and categorizing conversations through Streams and Topics. It's particularly beneficial in professional settings with diverse team discussions. Users appreciate its vibrant community and flexibility, offering both self-hosted options and better value plans compared to Slack. Despite not being fully open-source, Zulip provides a robust alternative.
    Top Positive Comment
    Paulo Coghi
    10

    More than feature parity with Slack, it's better because of Streams and Topics. It offer the same free tier with 10.000 max messages and better paid plans to the hosted version, and also provide the open source self-hosted option to install it on your own server and also remove the max messages limits. 5 stars

    Jump5231
    Positive
    0

    Excellent organization of topics and sub topics, great phone and desktop app, and web interface, new features and incredible support

    bast
    Positive
    0

    Zulip found the right balance to facilitate asynchronous communication and collaboration. It allows me to participate in several conversation topics without getting overwhelmed and without missing relevant messages. It allows more control over the data and it gives users more control to find their preferred communication and notification setup. It allows me to be away from the chat for 1-2 weeks and still catch up on all relevant discussion threads.

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    3 of 75 comments
    Slack Icon
    Zulip icon

    • Almost everyone thinks Zulip is a great Slack alternative.

    • Zulip is Free Personal and Open SourceSlack is Freemium and Proprietary
    • Zulip is Privacy focusedSlack is not according to our users
  4. Wire icon

    Wire

     311 likes
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    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

    Cost / License

    • Free Personal
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Self-Hosted
    • F-Droid
    • Software as a Service (SaaS)
    • Flathub
    • Snapcraft
    Wire screenshot 1
    Wire screenshot 2
    Wire screenshot 3
     
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    26
  5. Threema icon

    Threema

     135 likes
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    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.

    121 Threema alternatives

    Cost / License

    • Pay once
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Android Tablet
    • HUAWEI AppGallery
    • iPad
    • F-Droid
    • Flathub
    Threema screenshot 1
    Threema screenshot 2
    Threema screenshot 3
     
  6. Element X icon

    Element X

     39 likes
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    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.

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Android
    • iPhone
    • Android Tablet
    • iPad
    Element X screenshot 1
    Element X screenshot 2
    Element X screenshot 3
     
  9. Nextcloud Talk icon

    Nextcloud Talk

     33 likes
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    Self-hosted communication platform with secure audio, video, chat, web conferencing, screensharing, advanced encryption, and metadata privacy, running on user-controlled servers, supporting web and mobile apps, and eliminating third-party data exposure.

    109 Nextcloud Talk alternatives

    Cost / License

    • Free Personal
    • Open Source

    Application types

    Platforms

    • Online
    • Android
    • iPhone
    • iPad
    • Self-Hosted
    • Nextcloud
    • F-Droid
    • Flatpak
    • Chocolatey
    Nextcloud Talk screenshot 1
     
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    1
    Comments about Nextcloud Talk as an Alternative to Slack
    Guest
    Negative
    0

    Nextcloud Talk, like most of Nextcloud, is very heavyweight. So if you don't have a very good server, it's going to be very slow (for me it was around 10 seconds to send a single message)

    Review by a new / low-activity user.
    Slack Icon
    Nextcloud Talk icon
    • Nextcloud Talk is Free Personal and Open SourceSlack is Freemium and Proprietary
    • Nextcloud Talk is Privacy focusedSlack is not according to our users
  10. Tracim icon

    Tracim

     16 likes
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    All you need in a team collaboration tool dedicated to small efficient teams. Chat, notes, drive, online collaborative edition, calendars, news, spaces, notifications...

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Self-Hosted
     
  11. Strafe Chat icon

    Strafe Chat

     6 likes
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    StrafeChat is a web application focused on no censorship. We believe that people with any belief, opinion, or view should be able to communicate with each other freely.

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Online
    • Self-Hosted
    A channel in strafe chat
     
  12. Nerimity icon

    Nerimity

     11 likes
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    Nerimity is an open-source, community-first chat platform built to deliver an elegant, powerful, and feature-rich experience.

    27 Nerimity alternatives

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • Android Tablet
    • Self-Hosted
    Profile Interface [PC - 2025]
     
  13. Prav icon

    Prav

     4 likes
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    A user-friendly messenger for everyone with a focus on privacy and freedom.

    Cost / License

    • Free
    • Open Source

    Application types

    Platforms

    • Android
    • F-Droid
    Prav screenshot 1
    Prav screenshot 2
    Prav screenshot 3
     
  14. Modular.im icon

    Modular.im

     Like
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    Awesome hosting for Matrix chat and integrations - built on the Matrix open ecosystem for secure, decentralised communication, by the creators of Matrix.

    Cost / License

    • Subscription
    • Open Source

    Application type

    Platforms

    • Online
    • Self-Hosted
     
12 of 22 Slack alternatives