# Mail-in-a-Box vs Workout.cool

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

| | Mail-in-a-Box | Workout.cool |
|---|---|---|
| Score | 72/100 ✓ | 66/100 |
| Rank in category | #3 of 16 in Mail Server | #2 of 11 in Fitness Tracker |
| GitHub stars | 15 450 ✓ | 8 650 |
| Stars, last 30 days | +32 | +155 ✓ |
| Stable releases, 12 months | 4 ✓ | 1 |
| Latest release | v77 · 26 Sept 2026 ✓ | v1.3.2 · 7 Dec 2025 |
| Setup | Moderate | Easy ✓ |
| Official Docker image | No | No |
| License | CC0-1.0 | MIT |
| Main language | Python | Typescript |

## Which one should you pick?

Mail-in-a-Box scores 72/100 against 66/100 for Workout.cool, so it is the safer default.

Mail-in-a-Box ships more often: 4 stable releases in the past year, against 1 for Workout.cool.

If you want the quickest setup, Workout.cool is easier to run; Mail-in-a-Box needs more configuration.

Workout.cool is growing faster right now (+155 stars in 30 days).

## Details

- [Mail-in-a-Box](https://selfhost.directory/project/mail-in-a-box) (markdown: https://selfhost.directory/project/mail-in-a-box.md)
- [Workout.cool](https://selfhost.directory/project/workout-cool) (markdown: https://selfhost.directory/project/workout-cool.md)

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Source: https://selfhost.directory/compare/mail-in-a-box-vs-workout-cool