InboxSys vs Mail-Tester
| InboxSys | Mail-Tester | |
|---|---|---|
| Free plan | No | No |
| Free trial | No | No |
| Paid from | — | $10/mo |
| Open source | No | No |
| Platforms | Web | api, Web |
| Free plan | No | Yes |
| Inbox placement monitoring | Yes | No |
| Sender reputation monitoring | Yes | — |
| Authentication monitoring | Yes | No |
| Blocklist monitoring | Yes | No |
| API access | Yes | Yes |
| Paid from | — | 10 /mo |
| Spam trap monitoring | — | No |
Both are listed in Best Email Deliverability Software. On Freedom251, Mail-Tester scores higher on our published basis.