The 2 best Slack alternatives
Slack dominates business communication, but its per-user pricing can skyrocket for large teams. Additionally, constant notifications and limited message retention on the free plan are frequent complaints. Here are real alternatives for teams of any size.
Quick comparison
Detailed analysis of each alternative
M
Mattermost
Open SourceOpen source Slack alternative. Self-hosted, private and customizable.
Free ⭐⭐⭐⭐ 4.3
Frequently Asked Questions
What is the best free alternative to Slack?+
Discord is the most complete free alternative, with unlimited voice, text and video channels. For professional teams, Mattermost and Rocket.Chat have free self-hosted versions.
Is there an open source alternative to Slack?+
Yes. Mattermost, Rocket.Chat and Zulip are open source and can be installed on your own server. Mattermost is closest to Slack in user experience.