Rocket.Chat vs Spark IM
A side-by-side comparison of two self-hosted team chat options — licensing, setup difficulty, resource needs, and what each one replaces.
Rocket.Chat
Open-source team chat and collaboration platform
VS
Spark IM
Cross-platform XMPP instant messaging client
| Feature | Rocket.Chat | Spark IM |
|---|---|---|
| Deploy effort | Under-an-hour setup | Read-the-docs project |
| Health score | 100 · Excellent | 61 · Good |
| Category | Team Chat | Team Chat |
| License | MIT | Apache-2.0 |
| Language | TypeScript | Java |
| Setup difficulty | Medium | Easy |
| Min. RAM | 2,048 MB | 256 MB |
| Deployment | docker, snap, kubernetes | binary, source |
| GitHub stars | ★ 46,160 | ★ 604 |
| First released | 2015 | 2004 |
| Replaces | Slack, Microsoft Teams | Slack, Skype |
What are Rocket.Chat and Spark IM?
Rocket.Chat
Rocket.Chat is an open-source team communication platform offering channels, direct messages, voice, video, and omnichannel support. It targets organizations wanting a self-hosted Slack alternative. It is deployed via Docker or Snap.
- Channels, DMs and threads
- Voice and video calls
- Omnichannel customer support
- Apps and integrations
Spark IM
Spark is a full-featured, cross-platform XMPP instant messaging client with group chat, file transfer, and strong support for the Openfire server. It is aimed at organizations running their own chat infrastructure.
- XMPP desktop client
- Group chat and file transfer
- Tight Openfire integration
- Cross-platform
Rocket.Chat vs Spark IM: key differences
Rocket.Chat is written in TypeScript, while Spark IM is built with Java. Licensing differs — MIT for Rocket.Chat versus Apache-2.0 for Spark IM. Spark IM is the lighter option, starting around 256 MB of RAM against 2,048 MB for Rocket.Chat. Spark IM is the more established project (first released 2004), while Rocket.Chat arrived in 2015. Rocket.Chat has the considerably larger community, at 46,160 GitHub stars versus 604. Rocket.Chat lists first-class Docker deployment; Spark IM does not.
Why pick each one
Choose Rocket.Chat if…
- Feature-rich Slack alternative
- Strong integrations
- Self-hostable
Watch out for
- Heavy resource use
- Some features gated to paid plans
Choose Spark IM if…
- Released under the Apache-2.0 license
- Easy to set up — beginner-friendly
- Written in Java
- Tiny footprint — runs in 256 MB RAM
Frequently asked questions
Is Rocket.Chat or Spark IM better?
Neither is universally better. Rocket.Chat has the larger community, while Spark IM is simpler to set up (easy difficulty). Choose based on the comparison table above and your own setup.
Are Rocket.Chat and Spark IM free and open-source?
Yes. Rocket.Chat is licensed under MIT and Spark IM under Apache-2.0. Both can be self-hosted at no software cost.
Can I run Rocket.Chat and Spark IM with Docker?
Rocket.Chat: yes. Spark IM: check the project docs for container support.
Which is lighter on resources, Rocket.Chat or Spark IM?
Spark IM has the smaller minimum footprint at 256 MB of RAM, compared to about 2,048 MB for Rocket.Chat. Real-world usage depends on library size, user count, and enabled features.