Stable domains for local development ports, eliminating conflicts with free open-source tunnels and paid cloud options
Free MCP connector for Claude to access Spacemail email
Stage
Not given
Not given
Founded
Not given
Not given
Based in
Not given
GB
Pricing model
Freemium
Open source
Pricing
Free and Open Source: $0 (unlimited local tunnels, open source); Professional: $49/mo or $490/yr (unlimited cloud tunnels, visitor auth, feedback comments); Team: $149/mo or $1,490/yr (everything in Professional plus unlimited members, teams, shared subdomains, approvals, organization billing); Ente
Free
Key features
Stable local domains (*.portzero.local) for processes and containers
Cloud tunnels (*.tunnel.portzero.cloud) with HTTPS for LAN and internet access
Support for multiple programming languages
Git worktree support with per-branch URLs
AI agent integration with MCP server
Visitor authentication and access control
Feedback comments on live tunnels
Team access policies and approvals
Audit log (Enterprise plan)
Organization billing with no per-seat charges
Check new mail across all mailboxes with message previews
Search emails by sender, subject, words or date
Read full email messages with attachment names
Draft threaded replies and new emails saved to Drafts
Mark messages as read or unread and flag important ones
Archive, move or delete messages to Trash
Works with Claude Desktop, Claude Code, Cursor and Windsurf
Support for up to three mailboxes
Drafts saved for manual review before sending
Data stays on your computer, not collected by Norwich Website Design
What makes it different
Eliminates port conflicts by assigning stable virtual domains instead of port numbers
Free and open source for local use; no additional cost for cloud features on paid plans
Flat pricing with no meters, overages, or per-seat charges
Agent-ready with native MCP server integration for AI coding agents
Works across multiple OS and languages with zero port bookkeeping required
Free and open-source under MIT licence
Email content marked as untrusted to prevent phishing attacks
Deleted messages go to Trash, not permanently deleted
Independent project not affiliated with Spaceship or Spacemail
Port Zero
Spacemail for Claude