help/saving-and-sharing/saving-plans-with-email

In the iOS and Android apps the calculator starts without an account, and your plans stay on your device. Choose Save, then create a free account with your email and a password, or sign in if you already have one, and your plans are backed up online. On the web you create the free account first. You can also export a JSON file if you just want a copy on your computer.

After you save

The same email and password open your plans on another device. Sharing is only available once you have an account. If you sign in to an existing account, plans from that device are added to it.