Best Mattermost Alternatives in 2026

1. Slack

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Slack is a messaging app classified under Project Management for teams who see through the Earth! It facilitates quick decision-making and immediate problem solving through features like Real-Time Communication and Channel Organization. Users can also utilize Integration Capabilities with tools like Google Drive, Trello, and GitHub, powerful Search Functionality, Custom Notifications, and Cross-Platform Availability on desktop, web, and mobile.

2. Discord

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Discord is a communication tool built for online communities and users looking for a free-to-use option. It features high-quality voice and video chat, customizable servers with channels, roles, and permissions, and rich media integration for images, videos, and links. Users can also utilize bots and integrations to automate tasks, provide information, and entertain members through a user-friendly interface.

3. Zulip

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Zulip is designed for distributed teams seeking a communication platform that combines real-time chat with an email threading model. It stands out in the Communication category by allowing users to conduct separate threaded conversations within the same channel, supported by powerful search capabilities across channels and threads. Organizations benefit from its open-source nature, scalability for large numbers of users, and robust security features like end-to-end encryption and two-factor authentication.

4. Flock

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Flock is a Project Management tool built for teams seeking comprehensive communication and productivity features on the Web. It stands out with built-in productivity tools like shared to-dos, reminders, and polls, alongside team collaboration features such as group chat, video conferencing, and file sharing. Users can also integrate third-party applications like Google Drive, Trello, and GitHub to manage multiple tasks from a single platform, supported by an intuitive user interface and a robust search feature for finding messages, files, and links.

5. Element.io

Element.io is well-suited for users in the Communication category who prioritize privacy, security, and open-source transparency. Built on the Matrix open network, it provides end-to-end encryption for messaging, advanced group chat privacy settings, and secure video calls for teams. Key features include cross-platform accessibility across web, desktop (Windows, macOS, Linux), and mobile (iOS, Android), along with the ability to set up your own server for full data control.

6. Telegram

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Telegram is a Communication app built for users who need a free, ad-free messaging platform with a focus on speed and security. It stands out through features like end-to-end encryption for Secret Chats using the MTProto protocol, cloud storage for messages and files, and large group chats supporting up to 200,000 members. Users also get access to file sharing up to 2GB, custom bots for automation, multi-platform support across iOS, Android, Windows, macOS, and Linux, and extensive appearance customization.

7. Wire

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Wire is a private and secure messenger tailored for teams and individuals in the Communication category who prioritize strong data protection. It stands out with end-to-end encryption for all messages, calls, and files, alongside open-source code that allows anyone to audit the system for security vulnerabilities. Users also benefit from full compliance with European GDPR data protection laws.

8. Matrix.org

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Matrix.org is an open-source platform built on a decentralized architecture, making it a strong choice for users seeking resilience, scalability, and the prevention of single points of failure. Its core feature set includes end-to-end encryption for privacy, rich communication options spanning text, voice, video, and file sharing, and interoperability that bridges with networks like Slack and IRC. Because it operates on the Web platform, anyone can inspect, modify, and contribute to the code base.

9. Rocket.Chat

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Rocket.Chat is a JavaScript-based web chat server built on the Meteor fullstack framework, categorized under Communication. It is well-suited for organizations seeking an open source platform with self-hosted data privacy that complies with data protection regulations. Key capabilities include cross-platform support across web browsers, iOS, Android, and desktop applications, plus integrations with tools like GitHub, Jira, and Google Drive.

10. Microsoft Teams

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Microsoft Teams is suited for organizations needing Project Management tools with enterprise-level security, compliance, and management features. It stands out with features like Integration with Microsoft 365, Collaboration Features, Video Conferencing, Security and Compliance, and Customizability.