The same cards on every device
Without an account your cards live only on the phone where you saved them. With a free account you find them on your tablet, your computer and your next phone.
A free account is enough
You sign up with email and password. Sync is part of the free version.
The cards you already had
If you used Kardpal without an account, the cards on your phone are uploaded the first time you sign in. You don't have to add them again.
Offline too
You can edit cards without a connection. When you're back online, Kardpal sends your changes and fetches the ones made on your other devices. If the same card was changed in two places, the most recent change wins.
Worth it even with one phone
A browser can delete a site's data when storage runs low, and clearing the cache does the same. With an account your cards are also saved on the server and come back when you sign in.
Your data stays yours
In Settings you can download all your account data in a file or delete the account whenever you want.
Opens in your browser: no download, no sign-up. You can then add it to your Home screen.