If you have a partner, install the Between app so that you can have a special app with your partner.

This app is for you and your partner, and besides that, you can’t chat with anyone else. Now this app counts the number of days of your relationship. Register your girlfriend’s period day, and it will remind you before that. It tells you about birthdays or any important day. You send it photos, and at the end of every month it puts the photos together and creates an album for you. You can leave notes and letters for each other.