Slack AlternativesOnly apps categorised as Instant Messengers - Page 6

The best Instant Messenger alternative to Slack is Element, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Slack and loads of them are Instant Messengers so hopefully you can find a suitable replacement. Other interesting Instant Messenger alternatives to Slack are Zulip, Mattermost, Discord and Rocket.Chat.

filter to find the best alternatives

Slack alternatives are mainly Instant Messengers, but if you're looking for Group Chat Apps or Team Collaboration Tools you can filter on that. Other popular filters include Self-Hosted + Open Source. 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.
Slack iconSlack
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  • ...

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

More about Slack
More about Slack
Slack alternatives page was last updated Feb 16, 2025
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  1. Databag icon

    Databag

     3 likes
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    A tiny self-hosted federated messenger for the decentralized web.

    License model

    • Free • Open Source

    Application types

    Country of Origin

    • US flagUnited States

    Platforms

    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Self-Hosted
    • F-Droid
    Browser Screenshot

    Properties

    1.  Lightweight
    2.  Privacy focused

    Features

    1.  End-to-End Encryption
    2.  Ad-free
    3.  Decentralized
    4.  No Tracking
    5.  AES-256 Encryption
    6.  VoiP Calls
    7.  Federated

    Databag VS Slack

     
  2. i-net CoWork icon

    i-net CoWork

     7 likes
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    Text and video chat for your teams with unlimited users. Invite any customer to a conference. GDPR-compliant as self-hosted on your own server or in the cloud. Cross-platform support for Windows, Linux, macOS, and as a Docker container.

    4 i-net CoWork alternatives

    License model

    Application types

    Country of Origin

    • DE flagGermany
    • European Union flagEU

    Platforms

    • Mac
    • Windows
    • Linux
    • Self-Hosted
    Chatting in multiple channel. There, too, is an emoji and an optional GIF picker.

    Properties

    1.  Support for Themes
    2.  Lightweight
    3.  Privacy focused

    Features

    1.  Support for @mentions
    2.  Screen Sharing
    3.  Dark Mode
    4.  Desktop Sharing
    5.  Support for MarkDown
    6.  Two-factor Authentication
    7.  No Tracking
    8.  FIDO U2F (2FA) support
    9.  Ad-free
    10.  Reminders
    11.  Full-Text Search
    12.  Upload Screenshot

    i-net CoWork VS Slack

     
  4. Nerimity icon

    Nerimity

     5 likes
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    Nerimity is a modern and sleek chat app which includes features like free animated avatars & emojis, creating communities and posts, finding new communities to join, changing your username and tag for free and more!

    23 Nerimity alternatives

    License model

    • Free • Open Source

    Application types

    Country of Origin

    • International

    Platforms

    • Windows
    • Online
    • Android
    Profile Interface

    Properties

    1.  Privacy focused
    2.  Lightweight

    Features

    1.  Ad-free
    2.  Support for @mentions
    3.  VoiP Calls
    4.  No Tracking
    5.  Screen Sharing
    6.  Dark Mode
    7.  Cloud Sync

    Nerimity VS Slack

     
  5. Ad
    Screenshot
    Infomaniak kChat icon
    Infomaniak kChat

    kChat is a secure instant messaging for businesses, which makes it possible to discuss matters live and organise projects.

    https://www.infomaniak.com
    Learn More
  6. Jostle icon

    Jostle

     17 likes
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    At work, more than ever, we need a place to bring everyone together and help each person succeed. That’s Jostle. The employee success platform.

    License model

    Application types

    Platforms

    • Online
    • Android
    • iPhone

    Jostle Features

    1.  Real time collaboration
    2.  Employee Engagement
    3.  Social intranet
    4.  Cloud based

    Jostle VS Slack

     
  7. Prose Messaging icon

    Prose Messaging

     1 like
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    Prose is a distributed, open-source, and native platform for workplace communication.

    License model

    • Freemium • Open Source

    Application types

    Platforms

    • Mac
    • Online
    • Self-Hosted
    • YunoHost
    • Docker
    Prose Messaging screenshot 1

    Prose Messaging Features

    1.  End-to-End Encryption
    2.  Xmpp
    3.  Third party integrations
    4.  Integrated File Sharing
    5.  Integrated Search
    6.  Multi-Factor Authentication (MFA)
    7.  Chat history
    8.  Audio Calling

    Prose Messaging VS Slack

     
  8. Rivers IM icon

    Rivers IM

     2 likes
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    Rivers is a free communication and collaboration app that lets you have more organized and focused conversations. Whether you are a part of a company or friend group i.e. community, you will organize your conversations around topics. Create your cube.

    License model

    • Free • Proprietary

    Application types

    Country of Origin

    • IN flagIndia

    Platforms

    • Online
    • Android
    • iPhone
    Enjoy fast and reliable chat

    Rivers IM Features

    1.  Real time collaboration
    2.  Live topics
    3.  Community management

    Rivers IM VS Slack

     
  10. Keychat icon

    Keychat

     2 likes
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    • Senders send messages stamped with Bitcoin ecash to Nostr relays. The Nostr relays collect the Bitcoin ecash, then deliver messages to receivers.

    License model

    • Free • Open Source

    Application types

    Platforms

    • Android
    Keychat screenshot 1
    Keychat screenshot 2
    Keychat screenshot 3

    Properties

    1.  Lightweight
    2.  Privacy focused
    3.  Support for Themes

    Features

    1.  Dark Mode
    2.  VoiP Calls
    3.  Ad-free
    4.  Support for @mentions
    5.  Decentralized
    6.  No Tracking
    7.  No registration required
    8.  End-to-End Encryption

    Keychat VS Slack

     
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