Calibre vs COPS
A side-by-side comparison of two self-hosted e-books & media library options — licensing, setup difficulty, resource needs, and what each one replaces.
Calibre
Powerful ebook library manager with a built-in server
VS
COPS
Calibre OPDS and HTML PHP server
| Feature | Calibre | COPS |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 97 · Excellent | 73 · Good |
| Category | E-books & Media Library | E-books & Media Library |
| License | GPL-3.0 | GPL-2.0 |
| Language | Python | PHP |
| Setup difficulty | Easy | Easy |
| Min. RAM | 512 MB | 128 MB |
| Deployment | docker, bare-metal, binary | docker, bare-metal |
| GitHub stars | ★ 25,999 | ★ 134 |
| First released | 2006 | 2013 |
| Replaces | Kindle, Apple Books | Kindle |
What are Calibre and COPS?
Calibre
Calibre is a comprehensive ebook management application for organizing, converting, and reading digital books. Its built-in content server lets you browse and download your library from any device over the network.
- Ebook library management
- Format conversion
- Built-in content server
- Extensive plugin ecosystem
COPS
COPS is a lightweight Calibre OPDS and HTML PHP server that exposes a Calibre library without needing Calibre running. It targets users wanting a minimal way to share their library. It is deployed via Docker or a PHP stack.
- OPDS and HTML catalog
- Reads Calibre metadata database
- Very lightweight
- No Calibre process needed
Calibre vs COPS: key differences
Calibre is written in Python, while COPS is built with PHP. Licensing differs — GPL-3.0 for Calibre versus GPL-2.0 for COPS. COPS is the lighter option, starting around 128 MB of RAM against 512 MB for Calibre. Calibre is the more established project (first released 2006), while COPS arrived in 2013. Calibre has the considerably larger community, at 25,999 GitHub stars versus 134.
Why pick each one
Choose Calibre if…
- Industry-standard ebook tool
- Huge feature set
Watch out for
- Desktop UI feels dated
- Server is basic without add-ons
Choose COPS if…
- Extremely lightweight
- Easy to host
- Good OPDS support
Watch out for
- Read-only catalog
- Basic interface
Frequently asked questions
Is Calibre or COPS better?
Neither is universally better. Calibre has the larger community; both share a easy setup difficulty, so the decision comes down to features and licensing.
Are Calibre and COPS free and open-source?
Yes. Calibre is licensed under GPL-3.0 and COPS under GPL-2.0. Both can be self-hosted at no software cost.
Can I run Calibre and COPS with Docker?
Calibre: yes. COPS: yes.
Which is lighter on resources, Calibre or COPS?
COPS has the smaller minimum footprint at 128 MB of RAM, compared to about 512 MB for Calibre. Real-world usage depends on library size, user count, and enabled features.