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21tunnel

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21tunnel is an open-source tunneling service built for AI coding agents. It gives assistants like Claude Code, Cursor, and Devin scoped, short-lived credentials to open secure public URLs to localhost, with one-click cascade revoke — instead of handing the agent a full-access API token. It also works as a complete ngrok alternative: HTTP, TCP, SSH and gRPC tunnels from a single Rust binary, sticky subdomains, custom domains on the free tier, edge auth via Google sign-in, a live request inspector, and teams with RBAC and audit logs. The full stack self-hosts under MIT and Apache-2.0.

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