DC Metro and Bus is a free public transit app developed by Aidan Smeaton for Android devices. It provides real-time and schedule information for Metro rail, WMATA/Metro bus, Arlington Transit (ART), and DC Circulator. The app covers the Washington Metropolitan region, including DC, Northern Virginia, and Maryland.

One of the app's primary features is real-time rail predictions for all DC Metro stations. It also provides real-time and schedule information for all bus stops in the region. The comprehensive trip planner helps users plan their journey with ease. The location-based station and stop finder allows users to find the nearest station or stop. The interactive custom system map for Metro enables users to navigate the transit system efficiently. Additionally, users can save frequently used stops and stations for quick access.

DC Metro and Bus is always free, but users must have network access to use the app's resources. Overall, it is an excellent app for anyone who wants to navigate the Washington Metropolitan region's public transit system with ease.