K-9 Mail vs Spike
| K-9 Mail | Spike | |
|---|---|---|
| Free plan | No | Yes |
| Free trial | No | No |
| Paid from | — | $4/mo |
| Open source | No | No |
| Platforms | Android | Android, iOS, macOS, Web, Windows |
| Free plan | Yes | Yes |
| App coverage | mobile | all |
| Unified inbox | Yes | Yes |
| Offline access | Yes | — |
| Scheduled sending | No | Yes |
| Calendar tools | No | Yes |
| Paid from | — | $4/user/mo |
| Account limit | — | 3 accounts |
Both are listed in Best Email Clients. On Inferse, Spike scores higher on our published basis.