| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| macOS | Yes | — |
| Linux | Yes | — |
| Self-hosted | Yes | Yes |
| Plans published | 2 | 1 |
| Spec score · DNS Server Software | 8.1 (#3) | 7.7 (#8) |
| Purpose | BIND 9 is DNS name server software used by enterprises and service providers as a platform for distributed computing systems. | djbdns is a collection of tools for DNS caching, serving, client lookups, and debugging. |
| Support | ISC offers paid support with service levels and private expert support, while community help is available through public user mailing lists. | The maker points users to the dns mailing list and says third-party commercial support is available. |
