ifiv you ge people information at the time that they need it, they can make an informed decision. >>began bootstrapping a business, transit screen. >> if i press this, will it give me a location? reporter: along the way the former u.s. president took notice at a startup incubator, and in 2015 transit screen went live, sharing information at first from san francisco andhe d.c. area. >> we're driving them customers and giving them a better experience.he in return, don't charge us and we don't charge them. >> reporter: now transit screen d digests more than 2,000 fees from 60 cities around the world 24 hours a day. how often are these trains coming? are there a lot of ubers and bike shares and scooters nearby in the proximity of the building? >> if it is coming in four minutes, maybe i walk straight there. if it is inger, maybel decide i want to stop and grab a coffee. >> reporter: who pays for their service? >> everybody seems to use them. >> reporter: real estate developers and leasinggents ke tristan fray. of course, because it is all about location, location, location. transit seen