TOPS Viewer provides IEX's aggregated best quoted bid and offer position in real-time for all securities on IEX's displayed limit order book.
Available for web.
With the official IEX app you can:
Available for iOS and Android.
Near-real-time traded volume on the markets.
The IEX API is a set of RESTful services designed for developers and engineers. It can be used to build high-quality apps and services.
View the API docs.