Best self-hosted Slack alternatives for small teams
How to choose between Mattermost, Rocket.Chat, Zulip and Dock when you want chat on your own server.
Start with what you need
Small teams usually want one of three things from a self-hosted chat tool: keep data on their own server, stop paying per seat, or replace several tools at once. The right pick depends on which of the three matters most.
This guide compares four options at the category level. Features and licences change, so confirm details on each project's own site before you commit.
The options at a glance
| Tool | Best for | Watch out for |
|---|---|---|
| Mattermost | Chat-first teams that want a familiar Slack-like feel and many integrations | Some features sit in paid editions |
| Rocket.Chat | Teams that need many channels such as web chat and messaging apps | More to operate and tune |
| Zulip | Teams with long, topic-based discussions | Topic threading is a different habit from channels |
| Dock | Small teams that want chat, meetings, docs, tasks and AI agents in one app | Younger product and a smaller integration list |
What to weigh
Upkeep
Every self-hosted tool needs updates, HTTPS and backups. One process and one database file is easier than a stack of services.
What else you replace
If you also pay for meetings, docs and tasks, a bundle can remove more than the chat bill.
Integrations
Hosted tools have the biggest marketplaces. List the three integrations you cannot live without and check each option.
Where Dock fits
Dock is aimed at teams of up to a few dozen people. It has channels and DMs with threads and search, video meetings in the same app, real-time docs, tables, calendar, tasks and a drive. An MCP server lets AI agents such as Claude Code read and post in your channels, and there is a Lark history import.
It runs as one Node process with one SQLite file, so backups and moves are copying a file, and there is no per-seat licence. See Dock vs Mattermost, Dock vs Rocket.Chat and Dock vs Zulip.
A low-risk way to choose
Shortlist two
Pick the two that match your top need from the table above.
Run both for a week
Use a real project, not a demo channel. Include a meeting and a doc.
Count the upkeep
Ask who will update the server, and how long a restore from backup takes.
Questions
What is the easiest self-hosted Slack alternative to run?
It depends on your skills. Fewer moving parts is easier: Dock runs as one process with one database file; others use several services.
Which one has the most integrations?
Mattermost and Rocket.Chat have larger integration lists than newer tools. Check that your must-haves are covered.
Can I try without moving everyone?
Yes. Run it beside your current tool for one team or project first.
Is self-hosting worth it for a small team?
Often, once you pass a handful of seats and if someone is comfortable running a small server. If nobody is, stay hosted.