What is ngrok?

ngrok exposes local servers behind NATs and firewalls to the public internet over secure tunnels.

How it works

You download and run a program on your machine and provide it the port of a network service, usually a web server.

It connects to the ngrok cloud service which accepts traffic on a public address and relays that traffic through to the ngrok process running on your machine and then on to the local address you specified.

What it's good for

• Demoing web sites without deploying
• Building webhook consumers on your dev machine
• Testing mobile apps connected to your locally running backend
• Stable addresses for your connected devices that are deployed in the field
• Running personal cloud services from your home

Homebrew Cask extends Homebrew and brings its elegance, simplicity, and speed to OS X applications and large binaries alike.