
Slack
Rocket.Chat
Discord
Element.io
Telegram
Zulip
Microsoft Teams
Mattermost is an open source alternative to Slack.

ExpressJS
StatCounter
Histats
AFSAnalytics
Firebase
Woopra
KISSmetrics
Realtime application framework (Node.JS server)

Which is more popular?
Based on our record, Socket.io should be more popular than Mattermost. It has been mentioned 741 times since March 2021.
Website, pricing, platforms and company facts side by side.
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|---|---|---|
| Website | mattermost.com | socket.io |
| Pricing | ||
| Company | Startup from the United States | Startup from the United States |
| Listed in |
What each product offers, as listed by its team.


Possible disadvantages
Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
Mattermost is recommended for organizations that prioritize data privacy and security, need extensive customization options, or are looking to integrate a collaboration tool into existing systems. It is also suitable for teams in regulated industries requiring on-premises solutions.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
Mattermost - An Open Source, Self Hosted, Slack Chat Alternative
More videos
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Mattermost and Socket.io. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


Mattermost is an open-source platform that enables safe collaboration in self-hosted chat programs featuring file sharing, search, and integrations; groups and businesses can use it as an internal chat.
Mattermost uses monolithic architecture, which is tightly coupled and complex to understand. It restricts the scalability of the collaboration tool, which is a limitation for growing businesses. In that case,...
Below is a curated list of the 12 best self-hosted messaging apps like MirrorFly, Mattermost, Zulio, Nextcloud, and Rocket.chat that offer unique collaboration features and lets you take full control of your data.
It is a web-socket composition that is accessed by different languages of programming. Socket.io in NodeJS allows creating web socket applications such as score tickers, chatbots, dashboard APIs, including others....
Socket.io is a Javascript framework used to construct real-time apps and facilitate two-way communication between the client-side and servers. It uses functional reactive programming. You can construct applications...
In Node.js, Socket.io allows building web socket apps such as dashboard APIs, score tickets, chatbots, and others. It has great benefits over the regular Node.JS web app frameworks.
Recommendations tracked on public social media and blogs since March 2021.


The amazing thing is that there is almost always an open-source alternative that is 10x better in many ways, in the case of slack https://mattermost.com/ I'm looking forward for AI to make it very easy to deploy your own tools and walk... - Source: Hacker News / 26 days ago
How does it compare to MatterMost [1]? [1] https://mattermost.com/. - Source: Hacker News / 4 months ago
Slack's value is real, especially for cross-company conversations with clients and vendors. But for internal communication in companies that care about data residency or audit requirements, Mattermost is a credible self-hosted... - Source: dev.to / 5 months ago
I built the backend with nestjs, prisma, postgresql, Webrtc for real time back and forth conv and [socket.io](http://socket.io) events in panel like code run etc…. claude-haiku-4-5 for conv and anthropic.claude-sonnet-4-6 for interview... - Source: Hacker News / 6 months ago
You can create 4 different variations of a Socket.IO server with minimal code changes. And trust me you do NOT want to use the default one. I will be comparing combinations of the runtime (Bun, Node) and the websocket server (ws,... - Source: dev.to / 8 months ago
One possible solution is to use websockets, which establish a persistent connection between the client and server. This will allow us to send data to the client when we want to, without waiting for the client’s next request. Websockets... - Source: dev.to / 8 months ago
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