As a guest:
- Your progress, streak, and limits are stored only on that device.
- If you uninstall the app, clear its data, or switch phones, that progress is lost and can't be recovered.
- You don't need an email or password.
With an account:
- Your progress in the levels and the course is saved on our servers and linked to your account.
- You can switch phones or reinstall the app and sign in to continue where you left off.
- You can manage your profile from My account on this site.
Progress you made as a guest is not transferred automatically to a new account: it stays on the device where you made it.