Sharefox allows you to securely exchange sensitive information without anyone eavesdropping. Sharefox is a service for sending and receiving sensitive information. Think of sharing usernames, passwords, secret links, or API keys. You only want the desired recipient to read this kind of information. By using Sharefox, you can make sure the info can't be accessed by others.

How do we know they use phoenix:

The developers confirmed this.

Extra Sites:

https://sharefox.eu/ Both the public website as the application itself uses Phoenix LiveView.