# Calibre Web vs cobalt

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

| | Calibre Web | cobalt |
|---|---|---|
| Score | 78/100 | 83/100 ✓ |
| Rank in category | #1 of 7 in E-book Management | #1 of 45 in Download Management |
| GitHub stars | 18 487 | 45 600 ✓ |
| Stars, last 30 days | +247 | +1 790 ✓ |
| Stable releases, 12 months | 2 ✓ | 0 |
| Latest release | 0.6.27 · 8 Aug 2026 | — |
| Setup | Easy | Easy ✓ |
| Official Docker image | No | Yes ✓ |
| License | GPL-3.0 | AGPL-3.0 |
| Main language | Fluent | Svelte |

## Which one should you pick?

cobalt scores 83/100 against 78/100 for Calibre Web, so it is the safer default.

Calibre Web ships more often: 2 stable releases in the past year, against 0 for cobalt.

cobalt is growing faster right now (+1 790 stars in 30 days).

## Details

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

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