CalibrevsSemaphore UI
Two self-hosted projects, compared on the numbers selfhost.directory tracks live: score, popularity, release cadence and setup effort.
| Calibre | Semaphore UI | |
|---|---|---|
| Score | 83/100 | 73/100 |
| Rank in category | #1 of 19 in Ebook Management | #12 of 166 in Developer Tools |
| GitHub stars | 26 270 | 14 334 |
| Stars, last 30 days | +271 | +151 |
| Stable releases, 12 months | 18 | 20 |
| Latest release | v9.17.0 · 23 Oct 2026 | v2.18.31 · 7 Oct 2026 |
| Setup | Easy | Easy |
| Official Docker image | No | Yes |
| License | GPL-3.0 | MIT |
| Main language | Python | Go |
Which one should you pick?
Calibre scores 83/100 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 18 for Calibre.
Calibre details →Semaphore UI details →
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