PunBB vs SMF
A side-by-side comparison of two self-hosted forums & community options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | PunBB | SMF |
|---|---|---|
| Deploy effort | Read-the-docs project | Under-an-hour setup |
| Health score | 8 · At risk | 78 · Good |
| Category | Forums & Community | Forums & Community |
| License | GPL-2.0 | BSD-3-Clause |
| Language | PHP | PHP |
| Setup difficulty | Easy | Easy |
| Min. RAM | 128 MB | 256 MB |
| Deployment | bare-metal, source | docker, bare-metal, source |
| GitHub stars | ★ 199 | ★ 749 |
| First released | 2003 | 2004 |
| Replaces | phpBB | vBulletin, phpBB |
What are PunBB and SMF?
PunBB
PunBB is a lightweight PHP discussion board that emphasizes speed and simplicity over an extensive feature set. It produces standards-compliant, fast-loading pages.
- Minimal and fast
- Standards-compliant output
- Low resource usage
- Simple administration
SMF
SMF, or Simple Machines Forum, is a free, professional-grade forum package that lets you run an online community. It is known for stability, a strong permission system, and broad customization.
- Granular permission system
- Mods and themes support
- Strong moderation features
- Multilingual support
PunBB vs SMF: key differences
Both projects are written in PHP. Licensing differs — GPL-2.0 for PunBB versus BSD-3-Clause for SMF. PunBB is the lighter option, starting around 128 MB of RAM against 256 MB for SMF. SMF has the considerably larger community, at 749 GitHub stars versus 199. SMF lists first-class Docker deployment; PunBB does not.
Why pick each one
Choose PunBB if…
- Released under the GPL-2.0 license
- Easy to set up — beginner-friendly
- Written in PHP
- Tiny footprint — runs in 128 MB RAM
Watch out for
- Very basic feature set
- Limited active development
Choose SMF if…
- Reliable and well established
- No licensing fees
Watch out for
- Dated default appearance
- Slower modern development
Frequently asked questions
Is PunBB or SMF better?
Neither is universally better. SMF has the larger community; both share a easy setup difficulty, so the decision comes down to features and licensing.
Are PunBB and SMF free and open-source?
Yes. PunBB is licensed under GPL-2.0 and SMF under BSD-3-Clause. Both can be self-hosted at no software cost.
Can I run PunBB and SMF with Docker?
PunBB: check the project docs for container support. SMF: yes.
Which is lighter on resources, PunBB or SMF?
PunBB has the smaller minimum footprint at 128 MB of RAM, compared to about 256 MB for SMF. Real-world usage depends on library size, user count, and enabled features.