September 15, 2023 (1y ago)

Slack vs. Mattermost: Choosing the Right Communication Platform for Your Team

A head-to-head comparison of Slack and Mattermost, helping you decide which communication platform best fits your team's needs.

Martin Adams
Martin Adams
Strategy/Vision, OneTask
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Communication is the lifeblood of any team, and selecting the right platform is crucial for ensuring a smooth flow of information, collaboration, and productivity. Today we're looking at two major players: Slack and Mattermost. Both have their strengths and cater to different needs and preferences. Let's delve into the details and see which one might be an ideal fit for you and how it could potentially be integrated with OneTask.

User Interface and Experience

Slack is known for its clean, user-friendly interface. It's polished and intuitive, which means there's a low learning curve for new users. The ability to quickly search for messages, files, and integrate with countless other applications makes it a favorite for many teams.

On the other hand, Mattermost provides an interface that's remarkably similar to Slack, making it another good option for those looking for simplicity. It's an open-source platform, which means it can be tailored even further by those who have the coding chops to do so.

Customization and Control

Mattermost shines when it comes to customization and control. Being open-source, you can host it on your own servers and modify it to fit your exact requirements.

Slack's customization is mostly through its integrations and bots, allowing you to connect to a multitude of services. This is where it surpasses Mattermost; however, those integrations are dealt with on Slack's terms rather than your own.


Slack operates on a freemium model, with the free tier offering a limited message history and fewer integrations. Its paid plans provide broader access to message archives and additional features, but it can become pricey for larger teams.

Mattermost is free if self-hosted, but this means taking on the costs of your own infrastructure. For supported enterprise services, Mattermost also offers paid options, which can be cost-effective for large businesses, especially when considering the potential for self-managed scaling.


Security is increasingly vital for online communication tools. Slack has robust security measures in place, but because it's a cloud service, you're essentially entrusting your data to a third party.

Mattermost, being self-hostable, can offer greater security control. You manage your own data, which is a huge plus for many organizations, especially those with stringent compliance requirements.

Integration with OneTask

Integrating a communication platform with OneTask could streamline how you organize notifications and reminders within your team's communication channels. While Slack has extensive API support that could potentially allow seamless integration, Mattermost's open-source nature would enable a much deeper custom integration, employing OneTask to manage tasks and schedules directly within the platform based on conversations and project updates.


Both Slack and Mattermost offer valuable features, but your choice depends on your team's size, budget, need for customization, and security requirements. For teams looking for a hassle-free, richly integrated service with minimal setup, Slack is a fantastic option. If control and customization are at the top of your list and you have the resources to manage your infrastructure, Mattermost may be the platform for you. Furthermore, integrating these tools with a system like OneTask can elevate productivity and streamline task management within any team. Choose wisely, and happy collaborating!

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