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

GitHub Copilot
Tabnine
Cursor
ChatGPT
Safurai
MarsX
TabbyML
Free AI-powered code completion for *everyone*, *everywhere*

Which is more popular?
Based on our record, Mattermost should be more popular than Codeium. It has been mentioned 75 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | mattermost.com | codeium.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
Codeium is particularly recommended for software developers, coding enthusiasts, and teams looking to boost productivity and reduce the time spent on coding and debugging. It is suitable for beginners who need guidance, as well as experienced developers looking for efficiency enhancements.
Walkthroughs and reviews on video.
Mattermost - An Open Source, Self Hosted, Slack Chat Alternative
More videos
Codeium: Free Copilot Alternative
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Mattermost and Codeium. 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.
Codeium (Windsurf) is a fast, privacy-focused AI coding assistant that supports autocomplete, refactoring, and in-editor chat across multiple programming languages. Often, it’s used by full-stack developers who need...
Yes, some free alternatives to GitHub Copilot like Codeium offer features that can be suitable for enterprise use. However, for advanced needs, you might consider paid options like TabNine Enterprise or DeepCode (Snyk...
Another notable feature of Codeium is context pinning. It allows developers to pin any scope of code, such as a repository, a file, or a function, so Codeium takes the code in that section more seriously when...
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 / 5 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 / 6 months ago
Codeium provides free AI code completion and chat for individual developers. It integrates with VS Code, JetBrains, Vim, Emacs, and a growing list of other editors. The completions are competitive with Copilot in quality for most... - Source: dev.to / 5 months ago
Visit the official website at https://codeium.com Download the extension for your preferred code editor. Follow installation instructions to enable AI completions. Begin coding with AI-assisted suggestions immediately. - Source: dev.to / over 1 year ago
Codeium: Supports multiple editors and privacy-conscious teams. - Source: dev.to / over 1 year ago
When comparing Mattermost and Codeium, you can also consider the following products.


Your AI pair programmer. With GitHub Copilot, get suggestions for whole lines or entire functions right inside your editor.
Compare GitHub Copilot to Mattermost or Codeium:

Rocket.Chat is a Web Chat Server, developed in JavaScript, using the Meteor fullstack framework.
Compare Rocket.Chat to Mattermost or Codeium:

TabNine is the all-language autocompleter. We use deep learning to help you write code faster.
Compare Tabnine to Mattermost or Codeium:

Step up your game with a modern voice & text chat app. Crystal clear voice, multiple server and channel support, mobile apps, and more.
Compare Discord to Mattermost or Codeium:

The AI-first Code Editor. Build software faster in an editor designed for pair-programming with AI.
Compare Cursor to Mattermost or Codeium: