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

GitHub
DEV.to
Stack Exchange
Reddit
Quora
Question2Answer
LeetCode
Community-based Q&A part of the Stack Exchange platform.

Which is more popular?
Based on our record, Stack Overflow seems to be a lot more popular than Mattermost. While we know about 895 links to Stack Overflow, we've tracked only 75 mentions of Mattermost.
Website, pricing, platforms and company facts side by side.
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|---|---|---|
| Website | mattermost.com | stackoverflow.com |
| Pricing | — | |
| Company | 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
Episode 002 - Stack Overflow Developer Survey 2019 Review
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Mattermost and Stack Overflow. 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.
Simply put, Stack Overflow and the other forums in this suite are the best ways to reach out to fellow coders for help. They are powerful resources for any new or old coder to learn more about coding and connect with...
A notable mention within the StackExchange network, Stack Overflow specifically targets programming and development professionals. It’s widely regarded as the go-to resource for coding and software-related queries....
The gamified reputation system on Stack Overflow encourages users to provide high-quality answers, making it a reliable source for troubleshooting and learning. Beyond asking and answering questions, developers can...
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 / about 1 month 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
So, I reviewed the questions list again but this time, since the time I did view it about 9 hours ago [1]. 10 were negative scored, 5 positive scored, 15 0 scored, 4 has received answers. This is better than normal for those ~30. Usually... - Source: Hacker News / 9 months ago
It's surely both. Look at the newest questions: https://stackoverflow.com/questions?tab=Newest Most questions have negative karma. Even if somehow that is "deserved", that's not a healthy ecosystem. All that is left of SI are clueless... - Source: Hacker News / 9 months ago
A wide community: Beginners benefit most when answers are easily accessible. A language with strong Stack Overflow activity, official docs, and tutorials will keep you moving. - Source: dev.to / 11 months ago
When comparing Mattermost and Stack Overflow, you can also consider the following products.

A messaging app for teams who see through the Earth!
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Originally founded as a project to simplify sharing code, GitHub has grown into an application used by over a million people to store over two million code repositories, making GitHub the largest code host in the world.
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Rocket.Chat is a Web Chat Server, developed in JavaScript, using the Meteor fullstack framework.
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Where software engineers connect, build their resumes, and grow.
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Step up your game with a modern voice & text chat app. Crystal clear voice, multiple server and channel support, mobile apps, and more.
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Stack Exchange is a fast-growing network of 84 [and counting] question and answer sites on diverse...
Compare Stack Exchange to Mattermost or Stack Overflow: