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Slack vs Mattermost Comparison (2026)

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Compare similar apps

Microsoft Teams

4.5

Connecteam

4.6

Google Workspace

4.7

Good recommendations?

Slack

Mattermost

Overview

Slack is a single workspace that connects users with the people and tools they work with everyday, no matter where they are or what they do

Mattermost is an open source workplace messaging system for web, PCs & phones, that supports 1-1 & group messaging, file sharing, multiple languages, & more

Platforms supported

Web-based
iPhone app
Android app
Windows Phone app

Typical customers

Freelancers
Small businesses
Mid size businesses
Large enterprises

Customer support

Phone
Online
Knowledge base
Video tutorials

view more detailsview details

Platforms supported

Web-based
iPhone app
Android app
Windows Phone app

Typical customers

Freelancers
Small businesses
Mid size businesses
Large enterprises

Customer support

Phone
Online
Knowledge base
Video tutorials

view more detailsview details

Video & Screenshots

Pricing

Starting from

8.75

/user

Per month

Free trial available
Credit cardless trial
Free account
Subscription based

Starting from

/user

Per month

Free trial available
Credit cardless trial
Free account
Subscription based

User reviews

4.7

24.2K

17.4K

5.7K

912

127

Value for money

Ease of use

Features

Customer support

86%

would recommend this app

4.4

168

Value for money

Ease of use

Features

Customer support

79%

would recommend this app

Pros

“Channels help keep discussions organized by project or department, file sharing is seamless, notifications can be customized to reduce distractions, and the powerful search feature makes it easy to retrieve older conversations.”

Emilia W.

Network Support Coordinator

“The intuitive interface, reliable performance, and wide range of integrations have helped streamline our daily workflows and improve productivity. While there are occasional challenges with managing large volumes of messages and notifications, the benefits far outweigh these minor drawbacks.”

Andrea L.

Innovation Manager

“What I most like about Slack are the video call feature (Huddle) and screen-recording feature (which also allows you to record audio and camera with it).”

James W.

Salesforce Administrator

Pros

“Mattermost offers robust business instant messaging and live chat capabilities which allows us (teams) to seamlessly collaborate in real-time.”

Saad U.

Strategy Analyst

“I like that Mattermost has all the tools that allows us (teams) to coordinate on projects via creation of unlimited communication channels.”

Samuel M.

General Manager and Head of Operations

“Mattermost has a mobile application which I use on a daily basis to send files and collaborate vi a instant messaging.”

Ewa B.

Marketing Team Lead

Cons

“Notification management can also be challenging in active workspaces, leading to information overload if not carefully configured. While Slack offers powerful search capabilities, finding older conversations or specific files is not always as intuitive as it could be.”

Cristiano F.

Consultant

“The only time I get frustrated with it is when I need to invite partners (from external companies) into our workspace for targeted deal collaboration. When those folks come from organizations stuck with Teams, it's not easy to get them to adopt it for a limited time, even though it's easy enough to add them to the dedicated Slack workspace.”

Alicia R.

Director, Business Development

“Notifications can become overwhelming fast if you don't take time to configure them properly, and most people don't — which leads to either constant pinging or people muting everything and missing important messages.”

Enish S.

Business Administrator

Cons

“Unavailability of builtin video conferencing capability is the only flaw but I have integrated with external web conferencing applications.”

Saad U.

Strategy Analyst

“Mattermost lacks video conferencing feature unless it's been integrated with other external applications.”

Obhioze A.

Member

“One of the paid feature is unlimited search, and as a free user (10,000 line search limit, I think), it is often unclear whether you can't find what you're looking for because you hit the limit or because it's just not there.”