irssi vs Mattermost
A side-by-side comparison of two self-hosted apps from related categories — licensing, setup difficulty, resource needs, and what each one replaces.
Not the right match-up?
irssi
Modular terminal IRC client with scripting
VS
Mattermost
Secure collaboration for developer teams
| Feature | irssi | Mattermost |
|---|---|---|
| Category | Chat & Communication | Team Chat |
| License | GPL-2.0 | AGPL-3.0 |
| Language | C | TypeScript |
| Setup difficulty | Medium | Medium |
| Min. RAM | 32 MB | 2,048 MB |
| Deployment | bare-metal, binary, source | docker, bare-metal, kubernetes |
| GitHub stars | ★ 3,129 | ★ 38,708 |
| First released | 1999 | 2016 |
| Replaces | Slack | Slack, Microsoft Teams |
Why pick each one
Choose irssi if…
- Released under the GPL-2.0 license
- Active community (3.1k GitHub stars)
- Written in C
- Tiny footprint — runs in 32 MB RAM
Choose Mattermost if…
- Great for technical teams
- Strong security posture
- Good integrations
Frequently asked questions
Is irssi or Mattermost better?
Neither is universally better. Mattermost has the larger community; both share a medium setup difficulty, so the decision comes down to features and licensing.
Are irssi and Mattermost free and open-source?
Yes. irssi is licensed under GPL-2.0 and Mattermost under AGPL-3.0. Both can be self-hosted at no software cost.
Can I run irssi and Mattermost with Docker?
irssi: check the project docs for container support. Mattermost: yes.