Discuz! X 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 | Discuz! X | SMF |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 0 · At risk | 78 · Good |
| Category | Forums & Community | Forums & Community |
| License | GPL-3.0 | BSD-3-Clause |
| Language | PHP | PHP |
| Setup difficulty | Medium | Easy |
| Min. RAM | 512 MB | 256 MB |
| Deployment | docker, bare-metal, source | docker, bare-metal, source |
| GitHub stars | ★ 25 | ★ 749 |
| First released | 2010 | 2004 |
| Replaces | phpBB, vBulletin | vBulletin, phpBB |
What are Discuz! X and SMF?
Discuz! X
Discuz! X is a popular forum and community management system, especially prevalent in Chinese-speaking communities. It offers forums, portals, groups, and a plugin ecosystem.
- Forums, portal and groups
- Large plugin and template market
- Strong moderation tooling
- Mobile and app support
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
Discuz! X vs SMF: key differences
Both projects are written in PHP. Licensing differs — GPL-3.0 for Discuz! X versus BSD-3-Clause for SMF. SMF is the lighter option, starting around 256 MB of RAM against 512 MB for Discuz! X. SMF is the more established project (first released 2004), while Discuz! X arrived in 2010. SMF has the considerably larger community, at 749 GitHub stars versus 25.
Why pick each one
Choose Discuz! X if…
- Released under the GPL-3.0 license
- First-class Docker support for quick deployment
- Written in PHP
- Lightweight — runs in 512 MB RAM
Watch out for
- Documentation mostly in Chinese
- Dated codebase
Choose SMF if…
- Reliable and well established
- No licensing fees
Watch out for
- Dated default appearance
- Slower modern development
Frequently asked questions
Is Discuz! X or SMF better?
SMF is the stronger all-round pick: it has both the larger community and the simpler easy setup. Consider Discuz! X if its specific feature set fits your needs better.
Are Discuz! X and SMF free and open-source?
Yes. Discuz! X is licensed under GPL-3.0 and SMF under BSD-3-Clause. Both can be self-hosted at no software cost.
Can I run Discuz! X and SMF with Docker?
Discuz! X: yes. SMF: yes.
Which is lighter on resources, Discuz! X or SMF?
SMF has the smaller minimum footprint at 256 MB of RAM, compared to about 512 MB for Discuz! X. Real-world usage depends on library size, user count, and enabled features.