Harbor vs Singularity Registry Server
| Harbor | Singularity Registry Server | |
|---|---|---|
| Free plan | No | Yes |
| Free trial | No | No |
| Paid from | — | Free |
| Open source | No | No |
| Platforms | Web, Linux | api, Linux, self-hosted, Web |
| Image scanning | Yes | — |
| OCI artifacts | Yes | — |
| Immutable tags | Yes | Yes |
| Retention policies | Yes | — |
Both are listed in Best Container Registries. On Freedom251, Singularity Registry Server scores higher on our published basis.