Exactly 100 Registrations in the last 28 days

When I checked my app dashboard today, I got very seeing that the number for registrations for the past 28 days has three digits for the first time!

There is no account obligation on page91, which means users are seeing the additional value in creating an account:

• you can only save your vocabulary with an account (which also makes sense... how else could I save your personal vocabulary?! :D)

Now, I also have to show them the additional value in taken the "pro" membership. Big challenge!