The "Insights" section of the app is not available until the user goes through his third session. In the end, this section turns out to be premium-only but users are not aware. Even if it makes sens that you cannot access insights with only one session, it is still a good idea to block this section instead of showing a blank page. Users may be willing to know what is behind, which obviously drive first days retention.

In the first hours spent on Duolingo, 2 of the 5 items of the tap bar are locked. This has two goals. First, this is a way to appeal users' curiosity. They will be willing to keep using the app to see what is behind. Also, Duolingo ensures that users do not feel lost in the complexity of the app.

In Hinge, you can't use certain features unless you complete your profile. By doing so, Hinge fosters its users to give information for a win-win deal: the user has access to more features, Hinge has a more valuable user (more information about him, so more likely to meet other users' criteria)

A win-win deal between Hily and its users: you will have access to additional content within the app (e.g. all pics on a profile) if you accept to add more photos on your profile.