# Calibre vs cobalt

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

| | Calibre | cobalt |
|---|---|---|
| Score | 83/100 | 83/100 |
| Rank in category | #1 of 19 in Ebook Management | #1 of 45 in Download Management |
| GitHub stars | 26 270 | 45 591 ✓ |
| Stars, last 30 days | +271 | +1 807 ✓ |
| Stable releases, 12 months | 18 ✓ | 0 |
| Latest release | v9.17.0 · 23 Oct 2026 | — |
| Setup | Easy | Easy |
| Official Docker image | No | Yes ✓ |
| License | GPL-3.0 | AGPL-3.0 |
| Main language | Python | Svelte |

## Which one should you pick?

Calibre and cobalt score the same (83/100), so the choice comes down to the details below.

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

cobalt is growing faster right now (+1 807 stars in 30 days).

## Details

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

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