A new phone or computer
How to take your Kata data to a new iPhone, Android phone or browser.
On the old device, tap Back up now, then Export my data, and keep the file somewhere you control.
Restore the new iPhone from your iCloud backup, or move directly from the old one. Kata comes with its data. Sign in with the same account.
Set up from your Google backup, install Kata and sign in. Or use Restore with a recovery key. See Backups on Android and the web.
Between Android and a browser, use Restore with a recovery key and enter the key from the other device. From an iPhone, Export my data there and Import the file in the browser.
Export my data on one, move the file across, and Import it on the other.
Your plan belongs to your account, so it is there wherever you sign in.