K-9 Mail vs Mailspring
| K-9 Mail | Mailspring | |
|---|---|---|
| Free plan | No | Yes |
| Free trial | No | Yes |
| Paid from | — | — |
| Open source | No | No |
| Platforms | Android | Linux, macOS, Windows |
| Free plan | Yes | Yes |
| App coverage | mobile | desktop |
| Unified inbox | Yes | Yes |
| Offline access | Yes | Yes |
| Scheduled sending | No | Yes |
| Calendar tools | No | No |
Both are listed in Best Email Clients. On Inferse, Mailspring scores higher on our published basis.