Inbox Zero vs Spike
| Inbox Zero | Spike | |
|---|---|---|
| Free plan | No | Yes |
| Free trial | Yes | No |
| Paid from | $20/mo | $4/mo |
| Open source | No | No |
| Platforms | Android, api, extension, iOS, self-hosted, Web | Web, Windows, macOS, iOS, Android |
| Free plan | No | Yes |
| Inbox triage | Yes | — |
| AI reply drafting | Yes | — |
| Automatic sending | Yes | — |
| Thread summaries | Yes | — |
| Follow-up actions | Yes | — |
| Email platforms | gmail | — |
| Paid from | — | 4 /user/mo |
Both are listed in Best AI Email Assistants. On Inferse, Spike scores higher on our published basis.