# An Inbox Zero alternative that goes past the reply

> Momo AI is an Inbox Zero alternative for Gmail: drafts in your voice, replies owed, meetings booked over email and a morning brief. You tap Send.

Source: https://askmomo.app/alternatives/inbox-zero · Updated 16 October 2026

Inbox Zero is an open-source AI email assistant for Gmail and Outlook, from $20 per month on annual billing, with Reply Zero tracking what you owe and a free email app. Momo AI covers the same reply tracking and drafting for Gmail, then adds scheduling over email, promises and a morning brief, with an approval card before every send. It is free during early access.

## Where Inbox Zero is the better pick

If you want to read the code or run it yourself, Inbox Zero is open source with a self-hosting CLI, and it supports Outlook as well as Gmail. Its cold-email blocker, bulk unsubscribe and email analytics are mature, and the email app itself is free to use. Momo AI is closed source, hosted only, and Gmail only.

## Where Momo AI is the better pick

Inbox Zero's Reply Zero tells you who you owe and who to nudge, with drafts waiting. Momo AI starts there and keeps going.

- Scheduling by email: 2 to 4 free slots from Google Calendar offered in your voice, the reply read and the pick booked with a Meet link. Inbox Zero's pricing page does not describe this.
- Promises tracker: what you said you would send and what others owe you, closed when delivered.
- Morning brief by email with drafts, meeting prep and inbox counts, plus a prep notification 15 minutes before each call.
- Approval card on every send and every cancellation, with recipients chosen by code and a 10-second undo. Inbox Zero's drafts wait for you too, but its page does not state a sending rule.
- Reads PDF, Excel, Word and PowerPoint attachments when you ask about them.
- Free with every feature during early access; Pro at ₹499 per month planned. Inbox Zero's AI plans start at $20 per month on annual billing after a 7-day trial.

## Using both

Inbox Zero's unsubscribe and cold-email tools work on the mailbox, not on Momo AI, so there is nothing to conflict. Momo AI's own [inbox triage](/inbox-triage) clears newsletters and cold pitches with a 7-day undo if you would rather have one tool. The [best AI email assistant for Gmail](/blog/best-ai-email-assistant-for-gmail) post puts both in a wider table.

## Momo AI vs Inbox Zero

| | Momo AI | Inbox Zero |
|---|---|---|
| Price | Free now; ₹499/mo planned | Starter $20, Plus $35, Professional $50 per mo on annual billing; email app free; 7-day trial on AI plans |
| Works inside existing Gmail | Yes | Yes |
| Outlook | No | Yes |
| Open source, self-host option | No | Yes |
| Drafts in your voice | Yes | Yes |
| Tracks threads waiting on a reply | Yes | Reply Zero |
| Books meetings by emailing free slots | Yes | Not stated |
| Promises tracker | Yes | No |
| Morning brief by email | Yes | Pre-meeting briefings and email digests listed |
| Cold-email blocker and bulk unsubscribe | Triage with 7-day undo | Yes |
| Human approval before every send | Always | Drafts wait for you; rule not stated |

Prices read on 16 October 2026 from getinboxzero.com/pricing and askmomo.app/pricing. They may change. Momo AI is free during early access; Pro at ₹499 per month is planned.

## Questions

### Is Inbox Zero free?

The Inbox Zero email app is free to use and the project is open source, so you can self-host. Its hosted AI plans start at $20 per month on annual billing with a 7-day trial. Momo AI is free with every feature during early access.

### Does Momo AI work with Outlook like Inbox Zero?

No. Momo AI is Gmail and Google Calendar only. Inbox Zero supports both Gmail and Outlook.

### Is Momo AI open source?

No. Momo AI is hosted only. If reading or self-hosting the code matters to you, Inbox Zero is the better fit.

### Does Momo AI send email without approval?

Never. Every email waits for your tap on a card showing recipients and text, with a 10-second undo.

## Related

- [Inbox Zero vs Fyxer: which should you pick?](https://askmomo.app/compare/inbox-zero-vs-fyxer)
- [A Fyxer alternative that does the follow-through too](https://askmomo.app/alternatives/fyxer)
- [Know who hasn't replied, before you forget you asked](https://askmomo.app/follow-up-tracking)
- [Momo AI next to the alternatives](https://askmomo.app/compare)
- [The best AI email assistant for Gmail in 2026, compared](https://askmomo.app/blog/best-ai-email-assistant-for-gmail)

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Momo AI (Ask Momo, askmomo.app) is a personal AI assistant and chief of staff for Gmail and Google Calendar, built in India. It triages your inbox, drafts replies in your voice to Gmail Drafts, tracks who hasn't replied and what you promised, schedules meetings over email, and sends a morning brief. Every email and cancellation waits for your approval.