Alternatives to Slack for all platforms with any license

Discord

All-in-one voice, video and text chat for gamers that’s free, secure, and works on both your desktop and phone.
- Good app for your personal use. Wouldn't recommend for an Enterprise setting which is what Slack is more geared towards. TheBeast • Jan 2017 • 10 agrees and 1 disagrees
- Great app that even supports video meetings Guest • Apr 2016 • 7 agrees and 2 disagrees
- Better voice quality, easier to setup and use mrlegendanny • Jan 2018 • 4 agrees and 1 disagrees
- It's basically Slack with voice support Guest • Feb 2016
- It's cheap and very well implemented. Audio features are perfect. It's not enterprise, obviously, but it IS definitely a reference to follow. rdlu • Jul 2018
- slack is bassicly discord, & discord has GAMING OPTIONS un like slack Guest • Jul 2018 • 0 agrees and 1 disagrees
- Slack is a project productivity and communication enhancement tool with integrating with other collaborative tools like GitHub, document editors, storage, etc. Discord is for recreational chatting. thompsonmj • Aug 2018 • 0 agrees and 1 disagrees
- Discord is pure chat for gamers Guest • Feb 2016 • 0 agrees and 1 disagrees
- Discord is more gamer oriented than business oriented. alexandrezanni • Jan 2018 • 3 agrees and 4 disagrees
Freemium $ $ $ Mac Windows Linux Web Android ... iPhone Chrome OS BSD iPad FreeBSD
Voice Call Share your screen Ad-free Chat Bot ... Text chat Video calling Group chat Push to talk Custom roles Encrypted chat Group Voice Chat Low Latency Multi Channel Public groups chat Reactions Voice channels Camera capturing Channel manager Community based Custom Smileys Dedicated Server Hosting Development API Direct Messaging Electron based Free voice/text servers Gaming-focused Group Messaging In-app server browser In-Game Overlay Integrated Chat Integrated File Sharing Interface Overlay Low bandwidth usage Low memory usage Night mode/Dark Theme Permission system Persistent Chat Photo Sharing Positional audio Responsive design Share your screen Single Sign-On Team Collaboration Webcam overlays Youtube Gaming Integration Add a feature

579 Like
Riot.im

Riot (formerly Vector) is an opensource interoperable app running on Web, iOS and Android. It is built around chat rooms, both public and private and provides messaging...
- decentralised, federated, end-to-end encrypted communication. User6044478 • Oct 2017 • 5 agrees and 0 disagrees
- It's built atop Matrix, which provides distributed, federated instant messaging, voice and video calling with the ability to bridge into other networks (IRC, etc.) lampholder • Jul 2017 • 3 agrees and 0 disagrees
- Free and opensource with better performance and features for team communication. Guest • Aug 2017 • 3 agrees and 1 disagrees
- 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! brinerustle • Mar 2018 • 1 agrees and 0 disagrees
- Federated, free standard and free software Guest • Feb 2018
Free Open Source Mac Windows Linux Web Android ... iPhone Android Tablet iPad Self-Hosted Chrome Safari F-Droid Firefox
Apps with End-to-End Encryption Decentralized Voice Call Group chat ... Matrix.org protocol Video calling Community based Custom widgets DRM Free Encrypted chat GitHub integration Group collaboration Integrated File Sharing MarkDown support File Sending Server Moderation Server side history Slack integration Team Collaboration Video calling Add a feature

212 Like
Mattermost

Mattermost is an open source, self-hosted Slack alternative. As an alternative to proprietary SaaS messaging, Mattermost brings...
- 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 • 3 agrees and 1 disagrees
- It is very much a Slack clone with added features + it's open source! Guest • May 2017 • 2 agrees and 2 disagrees
- it is similar in features, and has some more, for example XMPP compatibility (-> many more client choice) and ability to self host it! Guest • Jul 2018
- Same functionality. Same interface. At the same time, there are much fewer restrictions. IN my experience, the free version is great enough for a team of 100 people shelehovchanin • 15 days ago
- 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 • May 2017 • 0 agrees and 1 disagrees
- Mattermost is quite versatile and has been used within several of my past employers. Guest • May 2018 • 0 agrees and 1 disagrees
Freemium $ $ $ Open Source Mac Windows Linux Android iPhone ... Android Tablet iPad Self-Hosted JavaScript Go (Programming Language) Cloudron
Team Collaboration Group chat Data API Integrated File Sharing ... MarkDown support On-premises software Plugin API File Sending Slack integration Supports XMPP Add a feature

152 Like
Hangouts

Hangouts is a messaging app that lets you send and receive messages, photos and more, and even start free video and voice calls – one to one or with a group! ...
- Hangouts doesn't support file uploads other than images Guest • Jul 2018 • 2 agrees and 0 disagrees
- Hangouts is more peer-to-peer communication and it's an instant messenger. Slack is a team based and collaboration oriented platform with different features. Hangouts is not something like Slack. Guest • Jan 2019 • 1 agrees and 0 disagrees
- Google Hangout is the best communication tool because of its quality Vijayprakash • Jul 2018 • 0 agrees and 3 disagrees
Free Windows Web Android iPhone Chrome OS ... Android Tablet iPad Chrome Android Wear
Video calling Gmail integration Group chat Multi Device Support ... Share your screen Share your screen Supports archiving conversations Voice Call Voice messages WebRTC Add a feature

975 Like
Zulip

Zulip is a group chat app. Its most distinctive characteristic is that messages are threaded by topic, helping you have long-running, organized conversations....
- It's open source, and has really good threaded conversations. aviendha1591 • Nov 2017 • 5 agrees and 0 disagrees
- Three reasons: 1. Open source. 2. Stream 3. Topics abijith • Dec 2017 • 5 agrees and 0 disagrees
- Zulip offers a great unbeatable chatting experience. It shines in many places where Slack tends to slack. Sethu • Dec 2017 • 5 agrees and 0 disagrees
- Good community with great support. gamefreakerxD • Dec 2017
- Open-source, streams, topics, quick responses from devs hrishikeshpatil • Jan 2018
- Great community Easy Access Many organization sirepherox • Jan 2018
- It is open source and has a lot of topics. Guest • Jan 2018
- Zulip is very user friendly and is also open source! linacodes • Jan 2018
- It's open source and you can self host. It has great threading to group conversations so things are easier to find and more organized . Guest • Jul 2018
- One can easily switch in between conversation between different threads! Extremely helpful for any organisation. shantnukumar • Aug 2018
- Open Source without limitations when on premises. Much better information categorisation with Streams & Topics. Vibrant community. superbiche • Dec 2018
- Zulip is open source and the methods of communications used is vastly different. It is specially useful in professional environments where different teams might want to participate in different conversations at the same time. Zulip solves this problem by including topics, where in each channel/stream, multiple topics can exist at once, at the same time. Guest • Mar 2019
Free Open Source Mac Windows Linux Web Android ... iPhone Android Tablet BSD Self-Hosted
Threaded Conversations Group collaboration Chat Bot Community based ... GitHub integration Group chat Integrated File Sharing Live topics MarkDown support Team Collaboration Add a feature

136 Like
Wire

Wire is a secure and private messenger for phones, tablets and desktop. Crystal clear voice and video calls, private group chats, file sharing, audio and video messages...

Free Personal $ $ $ Open Source Mac Windows Linux Web Android ... iPhone Android Tablet iPad
Apps with End-to-End Encryption Encrypted chat Security focused Encrypted calls ... Group chat Video calling Voice Call Anonymity Integrated File Sharing Open Source apps Photo Sharing Privacy focused Privacy Protected Share your screen Secure File Sharing Video calling WebRTC Add a feature

200 Like
Matrix.org

Matrix is an open standard for decentralized persistent communication over IP. It can be used for decentralised group chat, WebRTC signaling, IoT-data transfer, ...
- Capable of everything Slack can do, but can be self-hosted - keeping a team's data in-house. nrg200 • Jul 2017
- It can be easily bridged to many other chat systems, including Slack, which makes transitioning *much* easier. It's also open source and decentralized (self-hostable + communication with other servers). Guest • Jul 2017
- Open source, fecentralized, federation, chat-voice-video function. User6044478 • Oct 2017
- Respects your Freedom. Increasingly popular Guest • Nov 2017
- Free open source instant messaging service with federation. Guest • Aug 2017 • 0 agrees and 1 disagrees
Free Open Source Mac Windows Linux Web Android ... iPhone Android Tablet iPad Self-Hosted WebRTC Python JavaScript Go (Programming Language) Java Perl
Apps with End-to-End Encryption Decentralized Chat Bot Distributed ... Encrypted chat GNU/linux-libre Group chat Real time collaboration Server side history Team Collaboration Voice Call WebRTC Add a feature

112 Like
Rocket.Chat

Rocket.Chat is a Web Chat Server, developed in JavaScript, using the Meteor fullstack framework.
- 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. JohnFastman • Dec 2016 • 3 agrees and 1 disagrees
- Rocket.Chat comes very close to slack regarding it's core features and handling. Guest • Jun 2018 • 1 agrees and 0 disagrees
- open source, locally hosted so you own your data. Guest • Nov 2018 • 0 agrees and 1 disagrees
Free Open Source Mac Windows Linux Android iPhone ... Self-Hosted Cloudron
Group chat Ad-free Chat Bot Extensible by Plugins/Extensions ... Integrated File Sharing Location Mapping Share your screen Self-Serve Capability Slack integration Voice messages Add a feature

83 Like
Jitsi

Jitsi (previously SIP Communicator) is an audio/video and chat communicator with full end-to-end encryption that supports protocols such as SIP, XMPP/Jabber, ICQ/AIM...

Free Open Source Mac Windows Linux Web Android ... iPhone BSD iPad
Apps with End-to-End Encryption Group chat iPhone/iPod sync Support for Multiple protocols ... Multiple Account support OTR Video calling WebRTC Add a feature

293 Like
Proficonf

Proficonf is a lightning fast and powerful video conferencing web app. That allows you to participate in one-click meetings with up to 250 participants, share your...
- It's a bit different, but Proficonf has much better video-chat and allows you to collaborate in real-time. I_never_give_up • 11 days ago • 3 agrees and 0 disagrees
Freemium $ $ $ Web
Video calling Supports HD Video Low bandwidth usage Team Collaboration ... HD-Rendering Web-Based Support for HD videos Integrated File Sharing Share your screen Record videos Audio Recording Call recording Consistent UI File-sync Real time collaboration Record HD screen Share content Share Videos Video collaboration Add a feature

36 Like
Conversations

Conversations is a privacy focused, open source XMPP Texting [Jabber] client for Android 4.0+ smart phones with wife-approved easy encryption [OTR, OMEMO, or GPG]. ...

Free Open Source Android Android Tablet
Decentralized Apps with End-to-End Encryption Encrypted chat Picture sharing ... Encrypted Connection Chat Bot Group chat Group Messaging Self destructing messages Gpg encryption OTR Public groups chat Add a feature

63 Like
Keybase

Keybase is a new and free security app for mobile phones and computers. For the geeks among us: it's open source and powered by public-key cryptography. Keybase...
- it's not suitable for chatting in a organization, with channels, file sharing etc Guest • Jul 2018 • 2 agrees and 0 disagrees
Free Open Source Mac Windows Linux Web Android ... iPhone Ruby JavaScript Go (Programming Language) Java
Ad-free Drive Encryption Encrypted chat Facebook integration ... GitHub integration PGP Encryption Private repositories Public key encryption Twitter integration Add a feature

46 Like
HipChat

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...
- Discontinued https://alternativeto.net/software/slack/ is acquiring Hipchat and https://alternativeto.net/software/stride-by-atlassian/ from Atlassian. the services will be discontinued after February 15th, 2019. https://www.atlassian.com/partnerships/slack
- Simple, very fast desktop client. Good web client. Guest • Feb 2018
Freemium Mac Windows Linux Web Android ... iPhone Android Tablet iPad Self-Hosted Apple Watch
Team Collaboration Integrated File Sharing Share your screen Add a feature

73 Like
Basecamp

Basecamp is a web-based project collaboration tool that allows groups of people to share files, meet deadlines, assign tasks, and centralize feedback.
- Slack is a communication/chat tool. Basecamp is project management. Guest • Aug 2017 • 6 agrees and 1 disagrees
- It is completely free for education users, and allows deeper integration with files and documents, allowing chat to be just that: chat. It also allows for several levels of organization and just about everything is customizable. Zeklandia • Apr 2018
Commercial $ $ $ Mac Windows Web Android iPhone ... iPad Software as a Service (SaaS)
Content Templates Gantt-charts Apps that Sync with Google Calendar iCal integration ... Support for @mentions Message board Outlook integration Real time collaboration Responsive design Social feed Task time tracking Team discussion To do lists Visual Organization Add a feature

196 Like
Glip

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...
- 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 • 2 agrees and 0 disagrees
Freemium Mac Windows Web Android iPhone ... Android Tablet iPad
Social feed Bitbucket Integration Box.com integration Built-in File Manager ... Calendar view CRM Dropbox integration GitHub integration Google Drive integration Group chat Group collaboration Integrated Chat Mailchimp integration Meeting notes Onedrive integration Real time collaboration Recurring tasks Share your screen Shared calendars Software as a Service Calendar Sync Team Collaboration Team work Trello integration Zapier integration Zendesk integration Add a feature

155 Like

Slack Comments

Comment by Adam11

about Slack · Jul 2018 · Helpful Not helpful 2 Helpful Report as spam

8$ per user monthly, its so expensive, I prefer to use Ziggs.io because its free and has much more features.

Comment by michaelcharvet

about Slack · Jun 2017 · Helpful Not helpful 1 Helpful Report as spam

Integrates with so many other useful apps and bots. It's a winner.

Comment by RemovedUser

about Slack · Jan 2018 · Helpful Not helpful Report as spam

Not available for Iran :(

Comment by JackieChang

about Slack · Jan 2018 · Helpful Not helpful -4 Helpful Report as spam

I tried Slack but it does not have enough tools for my day-to-day work. It was mostly used for chatting and it's really distracting. Our company wanted something more separated, like chat is chat and task is task.

Our company uses WorkDo . It has many tools such as tasks, events, leave, attendance and expenses that allows our company to be more focused on the tasks at hand.

[Edited by Danilo_Venom, February 05]

Slack

Slack is listed in

Apps for Slack

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Alternatives to Slack for all platforms with any license

Discord

Riot.im

Mattermost

Hangouts

Zulip

Wire

Matrix.org

Rocket.Chat

Jitsi

Proficonf

Conversations

Keybase

HipChat

Basecamp

Glip

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Desktop

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Slack Comments