Sidekick by OpenHand vs Mailbox MCP

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

Sidekick by OpenHand compared with Mailbox MCP
Detail	Sidekick by OpenHand	Mailbox MCP
What it does	An AI companion for your telehealth visit	Connect Claude, ChatGPT or any AI to your email mailbox
Stage	MVP	Established
Founded	Not given	2002
Based in	Not given	GB
Pricing model	Free	Freemium
Pricing	Early access is free during the limited early access program.	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.
Key features	Real-time conversation following during telehealth visits Medical term explanations Question suggestions during visits Visit recap and summary Desktop app for macOS and Windows	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
What makes it different	Explains medical terminology in real-time during conversations No AI model training on identifiable health data	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
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)	6 −11 (down) since last check	37 −1 (down) since last check
Trust Flow (Majestic)	18	34
Citation Flow (Majestic)	19	32
Referring domains (Majestic)	56	61

6 details filled in for both companies.

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