# Kill Bill vs Stalwart Mail Server

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

| | Kill Bill | Stalwart Mail Server |
|---|---|---|
| Score | 68/100 | 79/100 ✓ |
| Rank in category | #3 of 13 in Billing | #2 of 16 in Mail Server |
| GitHub stars | 5 827 | 15 489 ✓ |
| Stars, last 30 days | +66 | +686 ✓ |
| Stable releases, 12 months | 7 | 31 ✓ |
| Latest release | killbill-0.24.22 · 28 Sept 2026 | v1.0.1 · 28 Oct 2026 ✓ |
| Setup | Moderate | Moderate |
| Official Docker image | Yes | Yes |
| License | Apache-2.0 | AGPL-3.0-only AND LicenseRef-SEL |
| Main language | Java | Rust |

## Which one should you pick?

Stalwart Mail Server scores 79/100 against 68/100 for Kill Bill, so it is the safer default.

Stalwart Mail Server ships more often: 31 stable releases in the past year, against 7 for Kill Bill.

Stalwart Mail Server is growing faster right now (+686 stars in 30 days).

## Details

- [Kill Bill](https://selfhost.directory/project/kill-bill) (markdown: https://selfhost.directory/project/kill-bill.md)
- [Stalwart Mail Server](https://selfhost.directory/project/stalwart-mail-server) (markdown: https://selfhost.directory/project/stalwart-mail-server.md)

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Source: https://selfhost.directory/compare/kill-bill-vs-stalwart-mail-server