It took a lot of work to build this app and the premium version allows me to keep improving it.

I do not like ads and their user tracking in apps, so I do not show ads in my app. As alternative power users need to pay a small amount to use the app with unlimited entries and all premium features. If you just want to keep track of a few names and birthdays you should be able to use the app completely free.

You can choose between a subscription (monthly or yearly) and a one time payment. The features you get are the same, it is just a difference in the payment method.