Inbox Zero is freemium — a usable free tier with paid plans above it. Zero is free, with no paid plan attached. Both are listed under Email, Scheduling & Tasks, so this is a like-for-like comparison. Neither is ranked above the other — Flocci carries no sponsored placement.
Inbox Zero is freemium — a usable free tier with paid plans above it and is listed for open-source codebase (9k GitHub stars), self-hostable for free. Zero is free, with no paid plan attached and is listed for fully open-source (MIT license), self-hostable AI email client. Both sit in Email, Scheduling & Tasks.
Zero is the cheaper starting point: it is free, with no paid plan attached, while Inbox Zero is freemium — a usable free tier with paid plans above it. Pricing tiers here come from the catalog, not from a promotional page.
Choose Inbox Zero if you need open-source codebase (9k GitHub stars), self-hostable for free; choose Zero if you need fully open-source (MIT license), self-hostable AI email client. Flocci AI Tools does not rank one above the other — it shows both feature sets side by side and lets the requirement decide.
| Inbox Zero | Zero | |
|---|---|---|
| Pricing tier | Free tier + paid plans | Free |
| Free to start | Yes | Yes |
| Category | Productivity & Workflow | Productivity & Workflow |
| Type | Email, Scheduling & Tasks | Email, Scheduling & Tasks |
| Listed capabilities |
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| Tags | inbox zero ai, open source email ai, ai email rules, cold email blocker, gmail ai assistant free | zero email, open source email ai, mail0, self hosted email client, ai inbox |
| Website | getinboxzero.com | 0.email |
| Full page | Inbox Zero details → | Zero details → |
| Alternatives | Inbox Zero alternatives → | Zero alternatives → |