# cobalt vs Semaphore UI

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

| | cobalt | Semaphore UI |
|---|---|---|
| Score | 83/100 ✓ | 73/100 |
| Rank in category | #1 of 45 in Download Management | #12 of 166 in Developer Tools |
| GitHub stars | 45 614 ✓ | 14 337 |
| Stars, last 30 days | +1 804 ✓ | +149 |
| Stable releases, 12 months | 0 | 20 ✓ |
| Latest release | — | v2.18.31 · 7 Oct 2026 |
| Setup | Easy ✓ | Easy |
| Official Docker image | Yes | Yes |
| License | AGPL-3.0 | MIT |
| Main language | Svelte | Go |

## Which one should you pick?

cobalt 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 0 for cobalt.

cobalt is growing faster right now (+1 804 stars in 30 days).

## Details

- [cobalt](https://selfhost.directory/project/cobalt) (markdown: https://selfhost.directory/project/cobalt.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/cobalt-vs-semaphore-ui