Mailbox MCP vs OsmO

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Mailbox MCP compared with OsmO
Detail	Mailbox MCP	OsmO
What it does	Connect Claude, ChatGPT or any AI to your email mailbox	AI phone assistant that answers unknown callers, screens spam, takes messages, and makes calls for you
Stage	Established	Not given
Founded	2002	Not given
Based in	GB	IN
Pricing model	Freemium	Free trial
Pricing	Free: 5 calls per mailbox per day, no card required. Pro: £34.99 per mailbox per year plus VAT (£2.92 monthly equivalent). Team Access: Team 3 at £119.99 per year plus VAT, Team 5 at £199.99 per year plus VAT, Team 10 at £399.99 per year plus VAT per account.	Free 7-day trial, then OsmO Pro on iPhone (US$9.99 or ₹299) or Basic (US$7.99 or ₹199) and Premium (US$9.99 or ₹299) on Android. Prices are localized by store; see Apple App Store or Google Play for current pricing.
Key features	Read email without marking as read Read attachments: PDFs, spreadsheets, photos Reply in thread with proper headers Send as any of your email aliases Email routines on a schedule Permission levels per connection Works with Gmail, Outlook and IMAP	AI call screening for unknown numbers Custom voice cloning Outbound calls and appointment booking Transcripts and summaries of all calls Custom call-handling instructions Knowledge base for answering caller questions Skip AI list for priority callers Dedicated assistant phone line Recurring weekly calls Works on existing phone number via call forwarding
What makes it different	Leaves mailbox completely untouched—no duplicate sent items, no marked-as-read flags, threading preserved Works with any MCP-compatible AI—not limited to Claude or ChatGPT Attachments never encoded—up to 20 MB, four ways to attach without passing through AI Email routines run automatically on schedule without manual prompts	Answers calls in your own cloned voice instead of a generic robot voice Makes outbound calls for you, not just screens incoming calls Screens calls in real-time based on caller intent, not just blocklists Supports multiple languages including Spanish and Hindi No new phone number or SIM swap required
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	26 +1 (up) since last check	17 −1 (down) since last check
Trust Flow (Majestic)	34	6
Citation Flow (Majestic)	32	26
Referring domains (Majestic)	61	50

6 details filled in for both companies.

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