With more than 200 million monthly active users and average session durations close to 30 minutes, Character.AI may be the stickiest AI app. It was co-founded by two Googlers in November 2021 to infuse personalized superintelligence into an entertainment experience. (You can chat with pre-built synthetic characters like fake Elon Musk or fake Paris Hilton, or you can design your own.) Continue Reading →