Mailbox MCP vs Calldone

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 Calldone
Detail	Mailbox MCP	Calldone
What it does	Connect Claude, ChatGPT or any AI to your email mailbox	AI voice agents that answer your business calls 24/7, handling inbound calls, booking appointments, answering questions, and qualifying leads.
Stage	Established	Not given
Founded	2002	Not given
Based in	GB	US
Pricing model	Freemium	Paid
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.	Solo $49/month (75 min), Professional $99/month (200 min), Launch $299/month (500 min), Growth $499/month (1,200 min), Enterprise custom. Extra minutes $0.59/min (Solo), $0.49/min (Professional), $0.45/min (Launch), $0.35/min (Growth).
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	24/7 call answering on first ring Appointment booking into calendar or CRM Call recording, transcription and summarization Automatic call escalation to live team members Outbound call campaigns Custom voice training Multi-language support Manual dialer for campaigns and reminders
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	Natural-sounding custom voices vs generic robotic alternatives Built-in integrations and tools without complex infrastructure
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	4 no change since last check
Trust Flow (Majestic)	34	1
Citation Flow (Majestic)	32	13
Referring domains (Majestic)	61	9

6 details filled in for both companies.

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