Backdrop CMS vs Kirby
A side-by-side comparison of two self-hosted content management systems options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | Backdrop CMS | Kirby |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 83 · Excellent | 84 · Excellent |
| Category | Content Management Systems | Content Management Systems |
| License | GPL-2.0 | Proprietary |
| Language | PHP | PHP |
| Setup difficulty | Medium | Medium |
| Min. RAM | 512 MB | 256 MB |
| Deployment | docker, bare-metal, source | docker, bare-metal, source |
| GitHub stars | ★ 1,046 | ★ 1,531 |
| First released | 2015 | 2012 |
| Replaces | WordPress, Drupal | WordPress, Squarespace |
What are Backdrop CMS and Kirby?
Backdrop CMS
Backdrop CMS is an open-source content management system forked from Drupal 7, aimed at small to medium organizations. It keeps Drupal's power while focusing on lower cost and easier use.
- Drupal-derived power
- Configuration management
- Lower hosting requirements
- Layout system
Kirby
Kirby is a flexible file-based content management system that stores content in plain text files and gives developers full control over markup. It is popular for portfolios and custom-designed websites.
- File-based content storage
- Flexible panel for editors
- No database required
- Developer-friendly templating
Backdrop CMS vs Kirby: key differences
Both projects are written in PHP. Licensing differs — GPL-2.0 for Backdrop CMS versus Proprietary for Kirby. Kirby is the lighter option, starting around 256 MB of RAM against 512 MB for Backdrop CMS. Kirby is the more established project (first released 2012), while Backdrop CMS arrived in 2015.
Why pick each one
Choose Backdrop CMS if…
- Cheaper to run than Drupal
- Familiar to Drupal users
Watch out for
- Smaller community
- Fewer modules than Drupal
Choose Kirby if…
- Easy backups and version control
- Highly customizable
Watch out for
- Commercial license required for production
- Free only for personal use
Frequently asked questions
Is Backdrop CMS or Kirby better?
Neither is universally better. Kirby has the larger community; both share a medium setup difficulty, so the decision comes down to features and licensing.
Are Backdrop CMS and Kirby free and open-source?
Yes. Backdrop CMS is licensed under GPL-2.0 and Kirby under Proprietary. Both can be self-hosted at no software cost.
Can I run Backdrop CMS and Kirby with Docker?
Backdrop CMS: yes. Kirby: yes.
Which is lighter on resources, Backdrop CMS or Kirby?
Kirby has the smaller minimum footprint at 256 MB of RAM, compared to about 512 MB for Backdrop CMS. Real-world usage depends on library size, user count, and enabled features.