Element

Element: Open Source Alternative to Slack and Rocket.Chat

Element is an open-source collaboration client built on Matrix, an open, decentralized communication protocol. Unlike Rocket.Chat, which runs as a single self-hosted server, Matrix federates across many independent servers, so users on different homeservers can message each other — closer to how email works than to a single-vendor platform. Element is AGPL-3.0 licensed.

Core features

• End-to-end encryption by default — messages, voice, and video calls are encrypted between participants, not just in transit to a server.
• Federation — organizations can run their own homeserver and still communicate with users on other Matrix homeservers, rather than being locked into one vendor's network.
• Spaces — a way to group related rooms together, similar to how servers group channels in Discord-style tools.
• Cross-client interoperability — because Matrix is a protocol, Element interoperates with other Matrix clients, including Cinny.
• Bridges — Matrix bridges can connect rooms to other networks (e.g. Slack, IRC), useful for gradual migration.

Element vs Rocket.Chat

	Element	Rocket.Chat
License	AGPL-3.0	MIT
Architecture	Federated (Matrix protocol)	Single self-hosted server
Encryption	End-to-end by default	Optional E2E
Interoperability	Any Matrix client/server	Rocket.Chat ecosystem
Price	Free app; Element Server Suite Pro for managed enterprise deployments (sales-quoted)	Free community edition; paid enterprise tiers

Use cases

• Organizations needing data sovereignty — run your own homeserver and keep full control of where messages live.
• Cross-organization collaboration — federation lets separate companies or agencies talk to each other without either side joining the other's platform.
• Security-conscious teams that want encryption on by default rather than as an opt-in setting.

Limitations

• Self-hosting means operating a full Matrix homeserver (typically Synapse or Dendrite) in addition to the Element client — meaningfully heavier ops than a single self-contained app like Campfire or Rocket.Chat.
• Federation adds real architectural complexity: cross-server message delivery, key management, and moderation across servers you don't control are harder problems than a single-tenant chat app faces.
• Element's enterprise pricing (Element Server Suite Pro) isn't published — you need to contact sales for a quote.

Which one should you choose?

• Want default end-to-end encryption and the option to federate across organizations? Element is built for exactly this.
• Want a single self-hosted server without the operational overhead of running a homeserver? Rocket.Chat is simpler to stand up.
• Want a lighter, simpler Matrix client than Element? Cinny connects to the same homeservers with a leaner interface.

What Element Really Is (And Isn't)

Element is the Matrix protocol client—which means understanding it requires first understanding that you're not buying a chat app, you're buying access to an open, federated messaging standard. That's powerful for organizations committed to open infrastructure. It's also complex for everyone else.

Our Assessment: Element

Deployment tested

Aspect	Details
Method	Synapse (homeserver) + Element (client) via Docker
Time	≈2-3 hours total (Synapse setup is 80% of the work)
Required services	PostgreSQL, Coturn (TURN/STUN), reverse proxy, DNS
Difficulty	High — federation and homeserver concepts are foreign

What surprised us: The complexity isn't in Element itself—it's in running and tuning Synapse. TURN server configuration is a common showstopper. When Matrix calls fail, you're troubleshooting TURN, not Element. Documentation is split between Element pages and Synapse pages. Learning curve is steep.

OSSBase Reality Check

Element is the right choice if your organization is already betting on Matrix federation and open standards. But if you just want a Slack alternative, you're solving a much harder problem than necessary.

Compare your effort against:

• Slack: 10x easier to deploy, zero federation
• Rocket.Chat: Simpler setup, single-vendor
• Discord: Plug-and-play, closed-source

Hidden maintenance burden: Synapse tuning is ongoing. Database query performance degrades over time. You'll eventually need to optimize PostgreSQL, enable search indexing via Elasticsearch, or scale horizontally with a load balancer.

Sources

• Element Server Suite requirements
• Synapse installation guide
• TURN server setup
• Element pricing