# Calibre Web vs Semaphore UI

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

| | Calibre Web | Semaphore UI |
|---|---|---|
| Score | 78/100 ✓ | 73/100 |
| Rank in category | #1 of 7 in E-book Management | #12 of 166 in Developer Tools |
| GitHub stars | 18 488 ✓ | 14 337 |
| Stars, last 30 days | +248 ✓ | +149 |
| Stable releases, 12 months | 2 | 20 ✓ |
| Latest release | 0.6.27 · 8 Aug 2026 | v2.18.31 · 7 Oct 2026 ✓ |
| Setup | Easy | Easy |
| Official Docker image | No | Yes ✓ |
| License | GPL-3.0 | MIT |
| Main language | Fluent | Go |

## Which one should you pick?

Calibre Web scores 78/100 against 73/100 for Semaphore UI, so it is the safer default.

Semaphore UI ships more often: 20 stable releases in the past year, against 2 for Calibre Web.

## Details

- [Calibre Web](https://selfhost.directory/project/calibre-web) (markdown: https://selfhost.directory/project/calibre-web.md)
- [Semaphore UI](https://selfhost.directory/project/semaphore-ui) (markdown: https://selfhost.directory/project/semaphore-ui.md)

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