KMail vs Opterius Mail
| KMail | Opterius Mail | |
|---|---|---|
| Free plan | No | Yes |
| Free trial | No | No |
| Paid from | — | Free |
| Open source | No | No |
| Platforms | Linux | Web |
| Free plan | Yes | Yes |
| App coverage | desktop | web |
| Unified inbox | Yes | — |
| Offline access | Yes | — |
| Scheduled sending | Yes | — |
| Calendar tools | Yes | — |
Both are listed in Best Email Clients. On Inferse, KMail scores higher on our published basis.