darkzwarmer vs Mailwarmup
| darkzwarmer | Mailwarmup | |
|---|---|---|
| Free plan | No | No |
| Free trial | No | Yes |
| Paid from | — | $19/mo |
| Open source | No | No |
| Platforms | Linux, macOS, self-hosted, Windows | Web |
| Warmup network | private | shared |
| Mailbox providers | smtp | — |
| Custom warmup schedule | Yes | Yes |
| Multiple mailboxes | Yes | Yes |
| Free plan | — | No |
| Daily email limit | — | 50 /day |
| Spam monitoring | — | Yes |
Both are listed in Best Email Warmup Software. On Freedom251, darkzwarmer scores higher on our published basis.