Atheme IRC Services vs UnrealIRCd
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 | UnrealIRCd |
|---|---|---|
| Deploy effort | Read-the-docs project | Read-the-docs project |
| Health score | 59 · Fair | 75 · Good |
| Category | Chat & Communication | Chat & Communication |
| License | ISC | GPL-2.0 |
| Language | C | C |
| Setup difficulty | Hard | Medium |
| Min. RAM | 64 MB | 128 MB |
| Deployment | bare-metal, source | bare-metal, source |
| GitHub stars | ★ 429 | ★ 521 |
| First released | 2005 | 1999 |
| Replaces | Slack | Slack, Discord |
What are Atheme IRC Services and UnrealIRCd?
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
UnrealIRCd
UnrealIRCd is a long-established IRC server daemon known for its rich feature set, advanced security controls, and module system. It is one of the most widely deployed IRCd implementations.
- Extensive module system
- Advanced anti-abuse features
- TLS and IRCv3 support
- Highly configurable
Atheme IRC Services vs UnrealIRCd: key differences
Both projects are written in C. Licensing differs — ISC for Atheme IRC Services versus GPL-2.0 for UnrealIRCd. Atheme IRC Services is the lighter option, starting around 64 MB of RAM against 128 MB for UnrealIRCd. UnrealIRCd is the more established project (first released 1999), while Atheme IRC Services arrived in 2005.
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 UnrealIRCd if…
- Released under the GPL-2.0 license
- Written in C
- Tiny footprint — runs in 128 MB RAM
Frequently asked questions
Is Atheme IRC Services or UnrealIRCd better?
UnrealIRCd is the stronger all-round pick: it has both the larger community and the simpler medium setup. Consider Atheme IRC Services if its specific feature set fits your needs better.
Are Atheme IRC Services and UnrealIRCd free and open-source?
Yes. Atheme IRC Services is licensed under ISC and UnrealIRCd under GPL-2.0. Both can be self-hosted at no software cost.
Can I run Atheme IRC Services and UnrealIRCd with Docker?
Atheme IRC Services: check the project docs for container support. UnrealIRCd: check the project docs for container support.
Which is lighter on resources, Atheme IRC Services or UnrealIRCd?
Atheme IRC Services has the smaller minimum footprint at 64 MB of RAM, compared to about 128 MB for UnrealIRCd. Real-world usage depends on library size, user count, and enabled features.