Signing up is free! Many useful features are only available after you sign up, including:
Set http auth credentials to protect access to your tunnel and those you share it with.
ngrok http -auth "user:password" 80
Expose any networked service to the internet, even ones that don't use HTTP.
ngrok tcp 22
Run multiple tunnels simultaneously with a single ngrok client.
ngrok start demo-site ssh admin-ui