I'm actually using it on my Android phone, can I still use it without any purchase? Thanks guys
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Yes, you can.
At the same time, it is a good idea to have more than one device to store your 1Password data.
@reksahr: Indeed, the Pro features in 1Password for Android are available as an in-app purchase, but please be sure to backup your data if you're not using a 1Password.com membership, which includes automatic offsite backup and item history. Better safe than sorry!