Curio goes against the traditional smooth onboarding trend and displays a paywall as the very first interaction with users. If you don't pay attention, you could think that there is no free version. However, you can select "Want a preview? Take a look" to access the free version and enjoy 10 stories for free. The psychological rationale behind is interesting: the user feels lucky to get into a premium product and are aware that there is no way to use Curio in freemium mode.