Atheme IRC Services vs ircu2
A side-by-side comparison of two self-hosted chat & communication options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | Atheme IRC Services | ircu2 |
|---|---|---|
| Deploy effort | Read-the-docs project | Read-the-docs project |
| Health score | 59 · Fair | 51 · Fair |
| Category | Chat & Communication | Chat & Communication |
| License | ISC | GPL-2.0 |
| Language | C | C |
| Setup difficulty | Hard | Medium |
| Min. RAM | 64 MB | 64 MB |
| Deployment | bare-metal, source | bare-metal, source |
| GitHub stars | ★ 429 | ★ 64 |
| First released | 2005 | 1996 |
| Replaces | Slack | Discord, Slack |
What are Atheme IRC Services and ircu2?
Atheme IRC Services
Atheme is a set of IRC services designed for large and highly scalable IRC networks. It provides account registration, channel management, and a flexible modular architecture.
- Scales to large networks
- Modular service design
- Account and channel management
- Used by historic IRC networks
ircu2
ircu2 (ircd-undernet) is the IRC server daemon developed for and used by the Undernet IRC network. It can be self-hosted to run an IRC network and supports a feature-rich channel and server model.
- IRC server used by Undernet
- Feature-rich channel model
- Lightweight C daemon
Atheme IRC Services vs ircu2: key differences
Both projects are written in C. Licensing differs — ISC for Atheme IRC Services versus GPL-2.0 for ircu2. Ircu2 is the more established project (first released 1996), while Atheme IRC Services arrived in 2005. Atheme IRC Services has the considerably larger community, at 429 GitHub stars versus 64.
Why pick each one
Choose Atheme IRC Services if…
- Released under the ISC license
- Written in C
- Tiny footprint — runs in 64 MB RAM
Choose ircu2 if…
- Released under the GPL-2.0 license
- Written in C
- Tiny footprint — runs in 64 MB RAM
Frequently asked questions
Is Atheme IRC Services or ircu2 better?
Neither is universally better. Atheme IRC Services has the larger community, while ircu2 is simpler to set up (medium difficulty). Choose based on the comparison table above and your own setup.
Are Atheme IRC Services and ircu2 free and open-source?
Yes. Atheme IRC Services is licensed under ISC and ircu2 under GPL-2.0. Both can be self-hosted at no software cost.
Can I run Atheme IRC Services and ircu2 with Docker?
Atheme IRC Services: check the project docs for container support. ircu2: check the project docs for container support.