Slack
8 alternatives — 1 easy, 5 medium, 2 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 | |
|---|---|---|---|---|---|---|
| Chatwoot Self-hosted customer support inbox, live chat, and helpdesk platform. | medium | 2GB | iOS & Android | Active | ||
| Element Decentralized encrypted messaging client built on the Matrix protocol. | hard | 2GB | iOS & Android | Active | ||
| Mattermost Secure Slack-style team messaging platform with open-core self-hosted editions. | medium | 2GB | iOS & Android | Active | ||
| Mumble Low-latency self-hosted voice chat server and client for gaming, teams, and communities. | easy | 0.25GB | — | iOS & Android | Active | |
| Nextcloud Talk Self-hosted chat, video calls, webinars, and collaboration inside Nextcloud. | medium | 2GB | iOS & Android | Active | ||
| Rocket.Chat Team communication platform with channels, direct messaging, video calls, and open-core self-managed editions. | medium | 2GB | iOS & Android | Active | ||
| Synapse Matrix homeserver for federated chat, rooms, bridges, and end-to-end encrypted messaging. | hard | 2GB | — | Active | ||
| Zulip Threaded team chat that combines real-time messaging with email-like topic threading. | medium | 2GB | iOS & Android | Active |
Detailed Look
Chatwoot Top Pick
Self-hosted customer support inbox, live chat, and helpdesk platform.
Pros
- + Strong self-hosted alternative for support chat and shared inboxes
- + Supports multiple customer communication channels
- + Good fit for small businesses replacing hosted helpdesks
Cons
- - Not a general team chat replacement
- - Some business features may be paid or hosted-first
- - Requires email/channel configuration to be useful
Element
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 Slack-style team messaging platform with open-core self-hosted editions.
Pros
- + Clean Slack-like interface
- + Good DevOps integrations
- + Strong security and compliance features
- + Excellent mobile apps
Cons
- - Free self-hosted edition has feature and history limits
- - Plugin ecosystem smaller than Slack
- - Can feel bloated for small teams
- - Frequent breaking changes in plugins
Mumble
Low-latency self-hosted voice chat server and client for gaming, teams, and communities.
Pros
- + Very low latency voice communication
- + Mature clients and server
- + Lightweight compared with full team chat platforms
Cons
- - Voice-focused, not a full Slack or Discord replacement
- - UI feels old-school
- - Mobile and web experience is less polished than modern chat apps
Nextcloud Talk
Self-hosted chat, video calls, webinars, and collaboration inside Nextcloud.
Pros
- + Natural fit for existing Nextcloud deployments
- + Combines chat, calls, screen sharing, and mobile apps
- + Keeps meeting metadata and files in your own stack
Cons
- - Best performance may require a TURN server and high-performance backend
- - Less polished for large meetings than dedicated SaaS tools
- - Mostly makes sense if you already run Nextcloud
Rocket.Chat
Team communication platform with channels, direct messaging, video calls, and open-core self-managed editions.
Pros
- + Rich feature set out of the box
- + Good mobile apps
- + Extensive integration options
- + Active community
Cons
- - Can be resource heavy
- - Self-managed free edition has product and licensing limits
- - MongoDB dependency
- - Some features moved to paid tiers
Synapse
Matrix homeserver for federated chat, rooms, bridges, and end-to-end encrypted messaging.
Pros
- + Mature Matrix homeserver with federation support
- + Works with Element and other Matrix clients
- + Strong option for open federated team/community chat
Cons
- - Federation, media, and retention can be operationally heavy
- - PostgreSQL and reverse proxy setup are strongly recommended
- - Abuse and moderation controls matter on public servers
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 Chatwoot, Element, Mattermost side by side →