Slack AlternativesOnly apps categorised as Instant Messengers - Page 8

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 6, 2025
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  1. ONCE Campfire icon

    ONCE Campfire

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    Campfire is an installable, self-hosted group chat system. Easily invite people. Make rooms. @mentions, DMs, and mobile support. The basics done right. And since you get the code and host it yourself, you can customize it however you’d like for your own use.

    License model

    Application types

    Country of Origin

    • US flagUnited States

    Platforms

    • Self-Hosted
    • Docker
    • Amazon Web Services
    • DigitalOcean
    ONCE Campfire screenshot 1

    Top ONCE Campfire Features

    1.  No Tracking
    2.  Support for @mentions
    3.  Full-Text Search
    4.  Dark Mode
    5.  Ad-free
    6.  No Subscription
    7.  Channels
    8.  Reactions
    9.  Progressive Web App
    10.  Emoji reactions
    11.  Direct Messaging

    ONCE Campfire VS Slack

     
  2. Engage Spaces icon

    Engage Spaces

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    A Custom CRM for Nonprofits with a Full Suite of Apps. We solve the biggest problems nonprofits face in a modern and user-friendly CRM.

    License model

    Application types

    Country of Origin

    • US flagUnited States

    Platforms

    • Online
    • Android
    • iPhone
    • iPad
    Engage Spaces provides each team leader with their own team administration functions. Allow each team leader to manage their teams': roles, permissions, private notes, roster sizes, attendance, registration opportunities and more.

    Properties

    1.  Lightweight

    Features

    1.  Real time collaboration
    2.  Reminders
    3.  Ad-free
    4.  Two-factor Authentication
    5.  Encrypted Backup
    6.  Visual Pinboard
    7.  Dark Mode
    8.  Works Offline
    9.  Import CSV Data
    10.  FIDO U2F (2FA) support
    11.  AES-256 Encryption
    12.  Calendar View

    Engage Spaces VS Slack

     
  4. Fuse Chat icon

    Fuse Chat

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    Fuse Chat is a Video Chat script userfriendly php socket.io script With is fully responsive design whatever if you are using a mobile a computer or even a tablet will always fit your screen and give you the best chat experience possible.

    License model

    Application types

    Platforms

    • Online
    • Self-Hosted

    Fuse Chat Features

    1.  Text chat

    Fuse Chat 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. RelayBeam icon

    RelayBeam

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    RelayBeam is a messaging platform with an innovative multi-port feature for enhanced communication.

    License model

    • Free • Proprietary

    Application types

    Platforms

    • Online
    • Software as a Service (SaaS)
    RelayBeam screenshot 1

    RelayBeam Features

    1.  Real time collaboration
    2.  Ad-free
    3.  Team Messaging
    4.  Text messaging
    5.  Multi Channel

    RelayBeam VS Slack

     
  7. Diode Drive icon

    Diode Drive

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    Diode Drive offering a secure alternative to Slack, Google Drive, and various messaging apps (Signal, Telegram, etc.) for those looking to regain ownership of their personal or work related data/information.

    License model

    • Freemium • Proprietary

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Raspberry Pi
    Diode Drive screenshot 1

    Properties

    1.  Privacy focused

    Features

    1.  Real time collaboration
    2.  No Tracking
    3.  Shared Folders
    4.  Encrypted Backup
    5.  Support for MarkDown
    6.  Ad-free
    7.  No Coding Required
    8.  End-to-End Encryption
    9.  Decentralized
    10.  Full-Text Search
    11.  File Storage
    12.  Team Messaging

    Diode Drive VS Slack

     
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