# Calibre vs Zero-K

> Two self-hosted projects, compared on the numbers selfhost.directory tracks live: score, popularity, release cadence and setup effort.

| | Calibre | Zero-K |
|---|---|---|
| Score | 83/100 ✓ | 62/100 |
| Rank in category | #1 of 19 in Ebook Management | #2 of 23 in Gaming |
| GitHub stars | 26 267 ✓ | 877 |
| Stars, last 30 days | +268 ✓ | +28 |
| Stable releases, 12 months | 18 ✓ | 0 |
| Latest release | v9.17.0 · 23 Oct 2026 | — |
| Setup | Easy | Easy |
| Official Docker image | No | No |
| License | GPL-3.0 | GPL-2.0 |
| Main language | Python | Lua |

## Which one should you pick?

Calibre scores 83/100 against 62/100 for Zero-K, so it is the safer default.

Calibre ships more often: 18 stable releases in the past year, against 0 for Zero-K.

Calibre is growing faster right now (+268 stars in 30 days).

## Details

- [Calibre](https://selfhost.directory/project/calibre) (markdown: https://selfhost.directory/project/calibre.md)
- [Zero-K](https://selfhost.directory/project/zero-k) (markdown: https://selfhost.directory/project/zero-k.md)

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Source: https://selfhost.directory/compare/calibre-vs-zero-k