You can absolutely access your Calm account across multiple devices, as well as on our website.
Once you create a Calm account on one device, simply make sure you're logged in with the same email address on your additional device(s).
iPhone or Android App: To create a profile or sign in on the Calm app, tap the "More" button, and then tap "Profile". On the Profile page, tap "Sign up or Login."
Website: You can sign in to your account on our website, at calm.com/login.