Eventster is a free app that launched in June for iPhone and iPad, and an Android version is under development. Eventster populates the app with more than 600,000 listings from Zvents, but individuals can also list their events for free. Users can give a "thumbs up" or "thumbs down" vote to each listing, which moves those events to the top of the directory. Co-founder Luke Stangel said that, in the future, the system will analyze those votes along with an individual's iTunes library and Facebook "likes" to create personalized event recommendations. Users can filter events by keyword, location, date, and category; view them in a list or on a map; and save events directly to their calendar.