Discourse vs Flarum
A side-by-side comparison of two self-hosted social networks options — licensing, setup difficulty, resource needs, and what each one replaces.
Discourse
Modern open-source community discussion platform
VS
Flarum
Simple, fast, free forum software
| Feature | Discourse | Flarum |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 100 · Excellent | 91 · Excellent |
| Category | Social Networks | Social Networks |
| License | GPL-2.0 | MIT |
| Language | Ruby | PHP |
| Setup difficulty | Medium | Medium |
| Min. RAM | 2,048 MB | 512 MB |
| Deployment | docker, source | docker, bare-metal, source |
| GitHub stars | ★ 47,885 | ★ 6,750 |
| First released | 2013 | 2015 |
| Replaces | phpBB, Reddit | phpBB, vBulletin |
What are Discourse and Flarum?
Discourse
Discourse is a free, open-source platform for community discussion, forums, and mailing lists. It offers real-time updates, trust levels, and an extensive plugin ecosystem.
- Real-time forum updates
- Trust-level moderation
- Rich plugin ecosystem
- Email-in posting
Flarum
Flarum is a free, open-source forum software designed to be simple, fast, and elegant. It uses a single-page interface with an extension system for adding features.
- Single-page reactive UI
- Extension marketplace
- Mobile-friendly design
- Tag-based organization
Discourse vs Flarum: key differences
Discourse is written in Ruby, while Flarum is built with PHP. Licensing differs — GPL-2.0 for Discourse versus MIT for Flarum. Flarum is the lighter option, starting around 512 MB of RAM against 2,048 MB for Discourse. Discourse is the more established project (first released 2013), while Flarum arrived in 2015. Discourse has the considerably larger community, at 47,885 GitHub stars versus 6,750.
Why pick each one
Choose Discourse if…
- Polished modern UI
- Strong moderation tools
Watch out for
- Resource-hungry
- Opinionated Docker setup
Choose Flarum if…
- Fast and clean interface
- Easy to extend
Watch out for
- Smaller core feature set
- Relies on extensions for parity
Frequently asked questions
Is Discourse or Flarum better?
Neither is universally better. Discourse has the larger community; both share a medium setup difficulty, so the decision comes down to features and licensing.
Are Discourse and Flarum free and open-source?
Yes. Discourse is licensed under GPL-2.0 and Flarum under MIT. Both can be self-hosted at no software cost.
Can I run Discourse and Flarum with Docker?
Discourse: yes. Flarum: yes.
Which is lighter on resources, Discourse or Flarum?
Flarum has the smaller minimum footprint at 512 MB of RAM, compared to about 2,048 MB for Discourse. Real-world usage depends on library size, user count, and enabled features.