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Cobrain vs mailbox.bot

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

Cobrain compared with mailbox.bot
DetailCobrain logo Cobrainmailbox.bot logo mailbox.bot
What it doesShared memory for Claude, ChatGPT and your AIs Physical mailing address and postal mail API for AI agents
StageStartup Not given
Founded2026 Not given
Based inIT US
Pricing modelNot given Freemium
PricingFree: $0, up to 1,000 notes. Pro: $9/month, unlimited notes and shares. Team: $7/seat per month (minimum 3 seats), company brain with multiple admins. Outbound mail: $0/month base, USPS First-Class Mail (1-page letter) $2.00, USPS Priority Mail flat-rate envelope $15.00, USPS Certified Mail $20.00, Certified with Electronic Return Receipt $24.00. Printing: B&W $0.40/page, Color $0.70/page. Mailing address for AI agent: $15/month, includes 30 stand
Key features
  • Shared memory across different AIs
  • Markdown notes in real folders
  • Share branches with collaborators
  • MCP connector for Claude, ChatGPT and compatible AIs
  • Search by meaning on Pro and Team plans
  • Attach PDFs and documents for AI to read
  • Version history with unlimited revisions on Pro
  • Permission-based access control
  • Send outbound mail via API, MCP, or dashboard
  • Certified mail with proof of delivery
  • Inbound mail scanning and OCR
  • REST API and MCP server integration
  • Webhook notifications with HMAC-SHA256 signing
  • Batch mail and postcards from templates
  • Human-in-the-loop approval gates for mail
  • Multi-channel notifications via email, SMS, Slack, Discord
  • Fulfillment photos and tracking for all mail
What makes it different
  • Free plan with no expiration for solo users
  • Receivers of shares never pay
  • Built by an agency using it daily with 648 notes
  • Real physical street address for autonomous agents to receive mail and packages
  • Seamless API integration with AI agent frameworks like OpenClaw, Hermes, LangChain
  • Inbound mail becomes structured agentic context via OCR and webhooks
  • Complete tracking from document submission through delivery confirmation
  • No credit card required to start using the service
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)5 no change since last check22 no change since last check
Trust Flow (Majestic)71
Citation Flow (Majestic)2726
Referring domains (Majestic)1576

5 details filled in for both companies.

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