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Mailbox MCP vs UnicornFork

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 UnicornFork
DetailMailbox MCP logo Mailbox MCPUnicornFork logo UnicornFork
What it doesConnect Claude, ChatGPT or any AI to your email mailbox AI chess coach backed by Stockfish
StageEstablished Not given
Founded2002 Not given
Based inGB DE
Pricing modelFreemium Freemium
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: no card needed. Plus: 14€/month or 139€/year (save 17%). Pro: 39€/month or 399€/year (save 15%).
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
  • Explain chess positions in plain language
  • Three coaching prompts: Coach, Trainer, and Beginner
  • Import games from lichess.org and chess.com
  • Create and share custom coaching prompts
  • Free AI models available
  • Paid AI models (DeepSeek, OpenAI gpt-6-luna)
  • Full Stockfish on server with paid plans
  • Visualize moves on interactive chess board
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
  • Explains why moves work, not just what to play
  • Answers appear on the board for visual learning
  • Personalized coaching prompts for different skill levels
  • Free tier includes Stockfish analysis
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 check1 −1 (down) since last check
Trust Flow (Majestic)3412
Citation Flow (Majestic)3221
Referring domains (Majestic)611

6 details filled in for both companies.

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