Inbox Zero vs Kai
| Inbox Zero | Kai | |
|---|---|---|
| Free plan | No | No |
| Free trial | Yes | Yes |
| Paid from | $20/mo | $20/mo |
| Open source | No | No |
| Platforms | Android, api, extension, iOS, self-hosted, Web | Android, iOS, macOS, Web |
| Free plan | No | No |
| Inbox triage | Yes | Yes |
| AI reply drafting | Yes | Yes |
| Automatic sending | Yes | No |
| Thread summaries | Yes | — |
| Follow-up actions | Yes | Yes |
| Email platforms | gmail | gmail |
| Paid from | — | 50 /user/mo |
Both are listed in Best AI Email Assistants. On Samsung Mobile US Press, Inbox Zero scores higher on our published basis.