# openGym vs Semaphore UI

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

| | openGym | Semaphore UI |
|---|---|---|
| Score | 81/100 ✓ | 73/100 |
| Rank in category | #1 of 11 in Fitness Tracker | #12 of 166 in Developer Tools |
| GitHub stars | 17 064 ✓ | 14 336 |
| Stars, last 30 days | +2 895 ✓ | +148 |
| Stable releases, 12 months | 12 | 20 ✓ |
| Latest release | v1.4.3 · 26 Oct 2026 ✓ | v2.18.31 · 7 Oct 2026 |
| Setup | Easy | Easy |
| Official Docker image | Yes | Yes |
| License | AGPL-3.0 | MIT |
| Main language | JavaScript | Go |

## Which one should you pick?

openGym scores 81/100 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 12 for openGym.

openGym is growing faster right now (+2 895 stars in 30 days).

## Details

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