The Best Open Source Slack AlternativesTop Group Chat Apps & Instant Messengers like Slack in 2023
Element is a secure collaboration and messaging app based on the Matrix protocol. It’s decentralised to deliver digital sovereignty, and based on an open standard for easy connections and interoperability. It is end-to-end encrypted by default.
- - Element is the most popular Web-based, Windows, Android & Mac alternative to Slack.
- - Element is the most popular Open Source & free alternative to Slack.
Comments about Element as a Alternative to Slack
It is decentralized and it works with an open standard2
Federated, decentralized, encrypted, open-source.5
this is a open source and free software that is very useful for me1
Encrypted, free, open-source, decentralized0
Privacy by design and based on matrix protocol!2
Mattermost is a secure, open source platform for communication, collaboration, and workflow orchestration across tools and teams.
Comments about Mattermost as a Alternative to Slack
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 people7
Allmost the same interface and features3
Same with more emphasis on privacy.0
Great interface, you control your data.0
It's faster for one thing. It's far superior in terms of data ownership, and it's extremely scalable.1
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.
Comments about Zulip as a Alternative to Slack
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 stars3
the threading model is the best i've used for keeping up with active communities, and the open-source community is excellent.2
It's a little different, for sure, but what it does, it does better than slack. Not a open source copy of slack like mattermost. If you want slack and nothing else, but in open source, stick to mattermost, if you want something that exceeds that, choose zulip.2
The concept of topics to each message is a super useful feature :)3
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.4
Comments about Rocket.Chat as a Alternative to Slack
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.10
open source, locally hosted so you own your data.2
Rocket.Chat comes very close to slack regarding it's core features and handling.7
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.
- - Wire is the most popular SaaS alternative to Slack.
Opinions about Wire as a Alternative to Slack
Matrix defines a set of open APIs for decentralised communication, suitable for securely publishing, persisting and subscribing to data over a global open federation of servers with no single point of control.
Comments about Matrix.org as a Alternative to Slack
Capable of everything Slack can do, but can be self-hosted - keeping a team's data in-house.1
Open source, fecentralized, federation, chat-voice-video function.1
Matrix is a protocol, not a client.18
Respects your Freedom. Increasingly popular2
Free open source instant messaging service with federation.0
Revolt is a brand new chat platform designed around you.