# Calibre vs Ultimate Certificate Manager

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

| | Calibre | Ultimate Certificate Manager |
|---|---|---|
| Score | 83/100 ✓ | 50/100 |
| Rank in category | #1 of 19 in Ebook Management | #4 of 8 in Certificate Management |
| GitHub stars | 26 268 ✓ | 170 |
| Stars, last 30 days | +259 ✓ | +0 |
| Stable releases, 12 months | 18 ✓ | 4 |
| Latest release | v9.17.0 · 23 Oct 2026 | v2.246 · 27 Oct 2026 ✓ |
| Setup | Easy ✓ | Moderate |
| Official Docker image | No | Yes ✓ |
| License | GPL-3.0 | AGPL-3.0 |
| Main language | Python | Python |

## Which one should you pick?

Calibre scores 83/100 against 50/100 for Ultimate Certificate Manager, so it is the safer default.

Calibre ships more often: 18 stable releases in the past year, against 4 for Ultimate Certificate Manager.

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

Calibre is growing faster right now (+259 stars in 30 days).

## Details

- [Calibre](https://selfhost.directory/project/calibre) (markdown: https://selfhost.directory/project/calibre.md)
- [Ultimate Certificate Manager](https://selfhost.directory/project/ultimate-ca-manager) (markdown: https://selfhost.directory/project/ultimate-ca-manager.md)

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Source: https://selfhost.directory/compare/calibre-vs-ultimate-ca-manager