Spark IM vs Zulip Terminal
A side-by-side comparison of two self-hosted team chat options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | Spark IM | Zulip Terminal |
|---|---|---|
| Deploy effort | Read-the-docs project | Read-the-docs project |
| Health score | 61 · Good | 62 · Good |
| Category | Team Chat | Team Chat |
| License | Apache-2.0 | Apache-2.0 |
| Language | Java | Python |
| Setup difficulty | Easy | Easy |
| Min. RAM | 256 MB | 128 MB |
| Deployment | binary, source | bare-metal, binary |
| GitHub stars | ★ 604 | ★ 865 |
| First released | 2004 | 2018 |
| Replaces | Slack, Skype | Slack |
What are Spark IM and Zulip Terminal?
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
Zulip Terminal
Zulip Terminal is an interactive terminal client for the Zulip team chat platform, offering threaded conversations and keyboard-driven navigation. It connects to any self-hosted Zulip server.
- Threaded conversations
- Keyboard navigation
- Connects to any Zulip server
- Low resource usage
Spark IM vs Zulip Terminal: key differences
Spark IM is written in Java, while Zulip Terminal is built with Python. Zulip Terminal is the lighter option, starting around 128 MB of RAM against 256 MB for Spark IM. Spark IM is the more established project (first released 2004), while Zulip Terminal arrived in 2018.
Why pick each one
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
Choose Zulip Terminal if…
- Great for terminal users
- Lightweight
Watch out for
- Requires a Zulip server
- No media-rich UI
Frequently asked questions
Is Spark IM or Zulip Terminal better?
Neither is universally better. Zulip Terminal has the larger community; both share a easy setup difficulty, so the decision comes down to features and licensing.
Are Spark IM and Zulip Terminal free and open-source?
Yes. Spark IM is licensed under Apache-2.0 and Zulip Terminal under Apache-2.0. Both can be self-hosted at no software cost.
Can I run Spark IM and Zulip Terminal with Docker?
Spark IM: check the project docs for container support. Zulip Terminal: check the project docs for container support.
Which is lighter on resources, Spark IM or Zulip Terminal?
Zulip Terminal has the smaller minimum footprint at 128 MB of RAM, compared to about 256 MB for Spark IM. Real-world usage depends on library size, user count, and enabled features.