# Calibre vs NATS

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

| | Calibre | NATS |
|---|---|---|
| Score | 83/100 ✓ | 80/100 |
| Rank in category | #1 of 19 in Ebook Management | #2 of 12 in Message Broker |
| GitHub stars | 26 268 ✓ | 20 954 |
| Stars, last 30 days | +259 ✓ | +189 |
| Stable releases, 12 months | 18 | 18 |
| Latest release | v9.17.0 · 23 Oct 2026 | v2.14.9 · 26 Oct 2026 ✓ |
| Setup | Easy ✓ | Moderate |
| Official Docker image | No | Yes ✓ |
| License | GPL-3.0 | Apache-2.0 |
| Main language | Python | Go |

## Which one should you pick?

Calibre scores 83/100 against 80/100 for NATS, so it is the safer default.

If you want the quickest setup, Calibre is easier to run; NATS needs more configuration.

## Details

- [Calibre](https://selfhost.directory/project/calibre) (markdown: https://selfhost.directory/project/calibre.md)
- [NATS](https://selfhost.directory/project/nats) (markdown: https://selfhost.directory/project/nats.md)

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Source: https://selfhost.directory/compare/calibre-vs-nats