Alternatives to Slack for all platforms with any license



Web / Online

Show 30 less popular platforms
  • Skype icon


    Skype (/'ska?p/) is an instant messaging app that provides online text message and video chat services.

    Freemium Mac Windows Linux Web Android ... iPhone Blackberry Chrome OS Windows RT Android Tablet BSD Windows Phone iPad Apple Watch Android Wear

    • Can't handle same functionality. Do not integrate with other services Guest • Jan 2017 Disagree   Agree
    • No teams. Everybody has to add everybody. No search functionality. No nothing. Guest • Dec 2016 Disagree   Agree
    • Not "out of the box" secure / encrypted. Used it for 8 years and I decided to "grow up' into secure communication apps. To many wont send a letter thru the postal service without an envelope but throw a tantrum if anyone suggests to them use "secure / end to end encryption." Skype is one that bulks at any real security and acts like "deer in the headlights at anything...above 256 Bits or otherwise. Guest • Mar 2017 Disagree   Agree
    • Great video chat options and solid chat client for teams, we use it. OlaOct 2016 Disagree   Agree
  • Mattermost icon


    Mattermost is an open source, self-hosted Slack -alternative As an alternative to proprietary SaaS messaging, Mattermost brings...

    Open Source Mac Windows Linux Android iPhone ... Android Tablet iPad Self-Hosted JavaScript Go (Programming Language) Cloudron

    • Its the same but you keep your server where you want so no one is playing with your data, and you can have an unlimited history depending on what you need for free so really way better ! Guest • May 2017 Disagree   Agree
    • It is very much a Slack clone with added features + is open source! Guest • 10 days ago Disagree   Agree
    • 1. Open source 2. Most of the same functionality 3. Secure and private server possibilities (the data is, therefore, yours until the end of time). 4. Extra features when it comes to customization, a big difference actually. Only negative is that Slack look a lot better design wise, so you can't customize it optimally. Guest • 4 days ago Disagree   Agree
  • Rocket.Chat icon


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

    Open Source Mac Windows Linux Android iPhone ... Self-Hosted Cloudron

    • 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. JohnFastmanDec 2016 Disagree   Agree
  • HipChat icon


    HipChat is an instant messaging service designed for companies and teams. It has persistent chat rooms, one-to-one chat, searchable chat history, file sharing via drag...

    Freemium Mac Windows Linux Web Android ... iPhone Android Tablet iPad Self-Hosted Apple Watch

  • icon

    Matrix is an open standard for decentralized persistent communication over IP. It can be used for decentralised group chat, WebRTC signaling, IoT-data transfer, ...

    Open Source Mac Windows Linux Web Android ... iPhone Android Tablet iPad Self-Hosted WebRTC Python JavaScript Go (Programming Language) Java Perl

  • Glip icon


    Glip is instant messaging for teams and businesses to communicate and get work done at the same time. In Glip you work where your conversations are, so you always know...

    Freemium Mac Windows Web Android iPhone ... Android Tablet iPad

    • Has practically all of slack's features, plus tasks, calendar, etc. And the free account does not limit number of users or storage. Guest • Jun 2016 Disagree   Agree
  • Let's Chat icon

    Let's Chat

    Self-hosted chat for small teams. Features and Stuff BYOS (bring your own server) Persistent messages Multiple rooms New message alerts /...

    Open Source Self-Hosted Cloudron

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  • Google Groups icon

    Google Groups

    Google Groups is all about helping users connect with people, access information, and communicate effectively over email and on the web. Now theres a new version on the...

    Free Web

    No features added Add a feature

Slack Comments


Positive Comment by blejd
about Slack Nov 2016

The web and mobile apps are really good and focused, but desktop apps are huge memory hogs (~900MB for just 2 open teams).


Gridle: Achieve Kick-Ass Productivity

Comment by yashparallel
about Slack and Asana, Glip Nov 2016

You may also want to check out Gridle ( for all your team communication needs. It claims to bring together all forms of communication possible on internet today in one cloud based simple and beautiful environment. Takes care of your tasks, files, chats and video calls along with projects, teams and stuff!


#Slack or Telegram

Positive Comment by georgecoem
about Slack Jul 2016

I'm so accustomed to this tool but recently experienced minor issue. Had anyone have this problem with Slack when you connect to another network and Slack asks you to reboot? I've never experieced such thing with Telegram.


Messanger 4+ 1 Helpful

Positive Comment by dementor_88
about Slack Apr 2016

Easy to use. It does not distract from work.