How do I login to the Billy app? Steph P 29 July 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've forgotten my password Related articles How is Billy setup in my home? How should I place my sensors if I have pets? Can I buy more sensors? I've forgotten my password Where can I download the Billy app?