The referral program allows you to earn Pro for free by referring people to Cardbox. You earn 1 month of Pro for every 3 users that mark you as their referrer, up to a total of 3 months.
Share your Personal Link with the person you want to refer, either by opening your card and tapping Share Card… in the top-right menu, or by opening the Add Contacts screen and tapping Share Personal Link…. They can use the link to download the app if they haven't yet.
Ask the person you want to refer to tap your Personal Link. This will open your card and show a special Referral Program dialog if the person:
Has installed the Cardbox app
Has finished creating their card
Has not marked another user as their referrer yet
Has tapped your Personal Link within 24 hours of registering their account
Ask the refer to tap the Yes, [Your Name] Referred Me! button in the Referral Program dialog.
If enabled, you will receive a push notification telling you that you have a new referral. If you have enough referrals to get a free month of Pro, it will automatically be activated.