The MTA has developed several official web and mobile apps for its subway and bus services, and also provides data to private app developers to create their own unofficial MTA apps. In 2012, the MTA officially released the Subway Time app, which uses subway countdown clock data to determine the next-train arrival times on seven services. Real-time station information for the "mainline" A Division (numbered routes), comprising all numbered services except the 7 train, was made available to third party developers via an API. This was achieved through both the Subway Time mobile app and as open data. In early 2014, data for the L train were also given to developers. When Bluetooth-enabled countdown clocks were installed in the B Division (lettered services) in 2016 and 2017, they were also configured to feed data to the Subway Time app as well as in an open-data format.