Mail-Tester vs SenderSignal
| Mail-Tester | SenderSignal | |
|---|---|---|
| Free plan | No | No |
| Free trial | No | Yes |
| Paid from | $10/mo | — |
| Open source | No | No |
| Platforms | api, Web | Web |
| Free plan | Yes | Yes |
| Paid from | 10 /mo | 49 /mo |
| Inbox placement monitoring | No | Yes |
| Authentication monitoring | No | Yes |
| Blocklist monitoring | No | Yes |
| Spam trap monitoring | No | — |
| API access | Yes | Yes |
| Sender reputation monitoring | — | Yes |
Both are listed in Best Email Deliverability Software. On Samsung Mobile US Press, Mail-Tester scores higher on our published basis.