Flarum vs lemmyBB
A side-by-side comparison of two self-hosted social networks options — licensing, setup difficulty, resource needs, and what each one replaces.
Flarum
Simple, fast, free forum software
VS
lemmyBB
Archived
Forum-style web front-end for the Lemmy backend
| Feature | Flarum | lemmyBB |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 91 · Excellent | 6 · At risk |
| Status | Actively maintained | Archived |
| Category | Social Networks | Social Networks |
| License | MIT | AGPL-3.0 |
| Language | PHP | JavaScript |
| Setup difficulty | Medium | Medium |
| Min. RAM | 512 MB | 128 MB |
| Deployment | docker, bare-metal, source | docker, binary, source |
| GitHub stars | ★ 6,751 | ★ 200 |
| First released | 2015 | 2023 |
| Replaces | phpBB, vBulletin | Reddit, phpBB |
What are Flarum and lemmyBB?
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
lemmyBB
lemmyBB is an alternative front-end for Lemmy that presents the federated link aggregator with a traditional phpBB-style forum interface. It connects to any Lemmy instance through the public API.
- Classic forum-style Lemmy UI
- Works with any Lemmy instance
- Lightweight Rust front-end
- ActivityPub Threadiverse
Flarum vs lemmyBB: key differences
The biggest difference is maintenance: lemmyBB's repository is archived and no longer developed, while Flarum is actively maintained. Flarum is written in PHP, while lemmyBB is built with JavaScript. Licensing differs — MIT for Flarum versus AGPL-3.0 for lemmyBB. LemmyBB is the lighter option, starting around 128 MB of RAM against 512 MB for Flarum. Flarum is the more established project (first released 2015), while lemmyBB arrived in 2023. Flarum has the considerably larger community, at 6,751 GitHub stars versus 200.
Why pick each one
Choose Flarum if…
- Fast and clean interface
- Easy to extend
Watch out for
- Smaller core feature set
- Relies on extensions for parity
Choose lemmyBB if…
- Released under the AGPL-3.0 license
- First-class Docker support for quick deployment
- Written in JavaScript
- Tiny footprint — runs in 128 MB RAM
Frequently asked questions
Is Flarum or lemmyBB better?
Neither is universally better. Flarum has the larger community; both share a medium setup difficulty, so the decision comes down to features and licensing.
Are Flarum and lemmyBB free and open-source?
Yes. Flarum is licensed under MIT and lemmyBB under AGPL-3.0. Both can be self-hosted at no software cost.
Can I run Flarum and lemmyBB with Docker?
Flarum: yes. lemmyBB: yes.
Which is lighter on resources, Flarum or lemmyBB?
lemmyBB has the smaller minimum footprint at 128 MB of RAM, compared to about 512 MB for Flarum. Real-world usage depends on library size, user count, and enabled features.