{"id":40580,"date":"2025-10-12T16:23:32","date_gmt":"2025-10-12T13:23:32","guid":{"rendered":"https:\/\/trueconf.com/blog\/?p=40580"},"modified":"2026-01-15T13:35:48","modified_gmt":"2026-01-15T10:35:48","slug":"mattermost-vs-slack-vs-trueconf","status":"publish","type":"post","link":"https:\/\/trueconf.com/blog\/reviews-comparisons\/mattermost-vs-slack-vs-trueconf","title":{"rendered":"Mattermost vs. Slack vs. TrueConf: Which Communication App is Best in 2026?"},"content":{"rendered":"

\"Mattermost<\/p>\n

Team communication ecosystems have gradually become the structural backbone of contemporary workplaces in 2026. With remote and hybrid work environments becoming widespread, organizations depend on resilient apps to keep entire teams consistently connected. Slack is widely regarded as the long-standing standard-bearer of office chat \u2013 a cloud-based platform recognized for its channels, integrations, and continual activity stream. Mattermost, by contrast, attracts users seeking stronger control: it\u2019s an open-source chat framework that teams can host internally for enhanced privacy and deeper customization. TrueConf introduces a distinct angle, merging secure team messaging with advanced video conferencing inside a unified package. In this article, the comparison will cover Mattermost, Slack, and TrueConf across features, user experience, integrations, security, and pricing. The objective is to guide readers in determining which communication app provides the ideal match for their team\u2019s requirements in 2026.<\/p>\n

<\/p>\n

Mattermost vs. Slack vs. TrueConf: Key Features <\/h2>\n

\"Mattermost<\/a><\/p>\n

Both Slack, Mattermost, and TrueConf cover the basics of workplace chat \u2013 private and group messaging, file sharing, and search \u2013 but they each have unique strengths:<\/p>\n

Slack<\/b><\/p>\n

Slack pioneered the channel-based communication framework and polished its overall design to excellence. It delivers threaded exchanges, powerful retrieval, and a sleek, intuitive layout that keeps teams involved. Slack\u2019s biggest advantage is its broad ecosystem: it connects with hundreds of third-party apps and platforms out of the box, effectively allowing you to bring your project coordination, calendar, and other utilities into the chat. <\/p>\n

Slack also enables audio\/video calls (now through huddles) for rapid conversations. However, these integrated calls are intended for smaller groups \u2013 on paid plans, Slack huddles include up to 50 participants with video. <\/p>\n

Slack is a cloud service only, so your team connects through Slack\u2019s servers (there is no self-hosted alternative). This cloud-only approach means configuration is minimal, but you depend on Slack\u2019s infrastructure for all data retention and oversight.<\/p>\n

Mattermost<\/b><\/p>\n

Mattermost was fundamentally created as a secure, self-hosted counterpart to Slack. It\u2019s an open-source system that organizations can deploy on their own servers or in a private cloud, granting full control of data and customization. Mattermost\u2019s feature lineup is comparable to Slack\u2019s \u2013 channel-based chats, file sharing, searchable message archives, and even integrations \u2013 but it emphasizes control over flair. Out of the box, Mattermost provides valuable additions for technical teams, such as in-line code snippet sharing and workflow automation through integrations with CI\/CD tools. It supports plugins and custom bots, and you can theme or modify it to suit your needs. <\/p>\n

Mattermost has unveiled calling capabilities as well. For example, it offers 1-on-1 voice calls with screen sharing<\/a> on its professional plan, and through integrations or add-ons it can support group video calls (often by leveraging Jitsi or similar). By default, Mattermost\u2019s own Calls feature supports smaller group calls (roughly up to 15 participants in a Mattermost meeting) as a built-in limit. <\/p>\n

Like Slack, Mattermost is cross-platform (web, desktop, mobile apps) and lets you organize conversations in channels. Unlike Slack, you can choose to run Mattermost completely offline in your private network \u2013 a major advantage for organizations with strict data policies.<\/p>\n

TrueConf<\/b><\/p>\n

TrueConf\u2019s key defining feature is its heavy emphasis on video conferencing alongside team chat<\/a>. It\u2019s essentially a unified communications system<\/a>: you get persistent team messaging (private chats, group chats, channels) together with high-quality video meetings, all in one. <\/p>\n

TrueConf is typically deployed as an on-premises server inside your organization\u2019s network (though a cloud option exists). This means companies can keep all data internal \u2013 every message, call, and file remains on servers you control. Out of the box, TrueConf merges instant messaging with HD video calls<\/a>, screen sharing, file transfer, and even webinars. It supports video conferences up to 1,500 participants with up to 49 videos on screen, far surpassing the built-in capacities of Slack or Mattermost. TrueConf also includes features like interactive webinars, polling, and a whiteboard for collaboration. On the chat side, it has essentials like message search, editing, threading, and even read receipts (so you can see who has viewed a message in a group chat) \u2013 a feature Slack and Mattermost notably lack. <\/p>\n

In short, TrueConf\u2019s feature suite is geared toward organizations that need a secure all-in-one solution for both daily messaging and large-scale video meetings.<\/p>\n