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Mailbox MCP vs Unium™

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 Unium™
DetailMailbox MCP logo Mailbox MCPUnium™ logo Unium™
What it doesConnect Claude, ChatGPT or any AI to your email mailbox Shared AI chat for couples, friends and family
StageEstablished Not given
Founded2002 Not given
Based inGB GB
Pricing modelFreemium Free trial
PricingFree: 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 for 2 days (includes Balanced model, memory, voice notes and images, up to 5 people, no card needed). Together $10/month with balanced model, memory, voice notes, image generation, and extended model choice. Together Plus $20/month includes up to 2.2× the usage of Together. Household $40/month
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
  • Shared chats where multiple people can join the same conversation
  • Switch between AI models without losing context
  • Memory across chats
  • Voice notes and image generation
  • Private chats alongside shared ones
  • Web search integration
  • Add up to 10 people to one subscription
  • Available on iPhone, Android and web
  • Access to multiple AI models including GPT-6 and Claude Opus 5.5
  • No data training on user conversations
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
  • Multiple people in one chat instead of separate conversations
  • One subscription covers everyone on the account with no additional charges
  • Switch AI models without losing memory or context
  • AI facilitates discussion by asking both perspectives before suggesting compromises
  • Chats are shared by default but can be made private
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)26 +1 (up) since last check20 +3 (up) since last check
Trust Flow (Majestic)340
Citation Flow (Majestic)329
Referring domains (Majestic)612

6 details filled in for both companies.

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