Kai vs Spark +AI
| Kai | Spark +AI | |
|---|---|---|
| Free plan | No | Yes |
| Free trial | Yes | Yes |
| Paid from | $20/mo | $10/mo |
| Open source | No | No |
| Platforms | Android, iOS, macOS, Web | Android, iOS, macOS, Windows |
| Free plan | No | Yes |
| Paid from | 50 /user/mo | 10 /user/mo |
| Inbox triage | Yes | Yes |
| AI reply drafting | Yes | Yes |
| Automatic sending | No | No |
| Follow-up actions | Yes | Yes |
| Email platforms | gmail | other |
| Thread summaries | — | Yes |
Both are listed in Best AI Email Assistants. On Inferse, Spark +AI scores higher on our published basis.