How do I login to the Billy app? Steph P July 29, 2019 05:35 Updated You must be invited to join someone's Billy account. Once you are, you’ll be asked to set up an account and download the app. Where can I download the Billy app? I can't login to my Billy Account Related articles Where can I download the Billy app? How is Billy setup in my home? How should I place my sensors if I have pets? Is Billy easy to install? Is there any delivery or shipping fees?