I saw an article about this and downloaded the Perplexity app but I was unable to figure out if this was true? Do I need a paid tier? I just quickly worked thro

I saw an article about this and downloaded the Perplexity app but I was unable to figure out if this was true? Do I need a paid tier? I just quickly worked through the free sign up and couldn't sort it out. The demo looked really slick. Is it worth pursuing?