Slack
4 alternatives — 3 medium, 1 hard
Slack's pricing adds up quickly for growing teams, and your message history disappears on the free plan. These self-hosted team chat alternatives give you unlimited messages, full data ownership, and no per-user fees.
Why people leave Slack
- Expensive per-user pricing for small and medium teams
- Message history limited on free plan
- Data stored on Slack servers with no self-hosting option
- Frequent UI changes and feature bloat
Comparison
| App | Difficulty | RAM | Docker | Mobile | Status | |
|---|---|---|---|---|---|---|
| Element Decentralized encrypted messaging client built on the Matrix protocol. | hard | 2GB | iOS & Android | Active | ||
| Mattermost Secure team messaging platform designed as a Slack alternative for organizations. | medium | 2GB | iOS & Android | Active | ||
| Rocket.Chat Team communication platform with channels, direct messaging, and video calls. | medium | 2GB | iOS & Android | Active | ||
| Zulip Threaded team chat that combines real-time messaging with email-like topic threading. | medium | 2GB | iOS & Android | Active |
Detailed Look
Element Top Pick
Decentralized encrypted messaging client built on the Matrix protocol.
Pros
- + End-to-end encryption by default
- + Federated - no single point of control
- + Bridges to other platforms like Slack and Discord
- + Active development by Element HQ
Cons
- - Complex server setup with Synapse
- - Federation can be slow
- - Resource hungry for small deployments
- - UI can feel cluttered
Mattermost
Secure team messaging platform designed as a Slack alternative for organizations.
Pros
- + Clean Slack-like interface
- + Good DevOps integrations
- + Strong security and compliance features
- + Excellent mobile apps
Cons
- - Many features require Enterprise license
- - Plugin ecosystem smaller than Slack
- - Can feel bloated for small teams
- - Frequent breaking changes in plugins
Rocket.Chat
Team communication platform with channels, direct messaging, and video calls.
Pros
- + Rich feature set out of the box
- + Good mobile apps
- + Extensive integration options
- + Active community
Cons
- - Can be resource heavy
- - Free tier limitations increasing
- - MongoDB dependency
- - Some features moved to paid tiers
Zulip
Threaded team chat that combines real-time messaging with email-like topic threading.
Pros
- + Unique topic-based threading model
- + Great for async communication
- + Fully open source with no paid tiers for self-hosted
- + Excellent search
Cons
- - Threading model has a learning curve
- - Fewer integrations than Slack
- - Smaller community
- - UI feels dated compared to alternatives
FAQ
What is the best self-hosted Slack alternative?
Mattermost is the closest to Slack in look and feel, with good DevOps integrations. Element (Matrix) is best for federated, encrypted communication. Zulip's topic-based threading is great for async teams. Rocket.Chat offers the most features out of the box.
Can I migrate from Slack to a self-hosted alternative?
Mattermost and Rocket.Chat both have Slack import tools that bring over messages, channels, and users. Element can bridge to Slack during a transition period so you don't have to switch everyone at once.
Do self-hosted chat apps support video calls?
Rocket.Chat has built-in video calls via Jitsi integration. Element supports video calls natively through Matrix. Mattermost integrates with Jitsi or Zoom. Zulip relies on external video call integrations.
Can't decide? Compare Element, Mattermost, Rocket.Chat side by side →