# altcha vs Unison

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

| | altcha | Unison |
|---|---|---|
| Score | 63/100 | 65/100 ✓ |
| Rank in category | #2 of 4 in Anti-Spam | #2 of 15 in File Sync |
| GitHub stars | 2 859 | 5 560 ✓ |
| Stars, last 30 days | +83 ✓ | +66 |
| Stable releases, 12 months | 18 ✓ | 2 |
| Latest release | v3.5.0 · 22 Oct 2026 ✓ | v2.54.0 · 1 May 2026 |
| Setup | Moderate | Moderate ✓ |
| Official Docker image | No | No |
| License | MIT | GPL-3.0 |
| Main language | Typescript | OCaml |

## Which one should you pick?

Unison scores 65/100 against 63/100 for altcha, so it is the safer default.

altcha ships more often: 18 stable releases in the past year, against 2 for Unison.

## Details

- [altcha](https://selfhost.directory/project/altcha) (markdown: https://selfhost.directory/project/altcha.md)
- [Unison](https://selfhost.directory/project/unison) (markdown: https://selfhost.directory/project/unison.md)

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Source: https://selfhost.directory/compare/altcha-vs-unison