A web app is an application program that is stored in a browser and delivered over the internet through browser interface. Cross platform apps are those apps that are compatible with different mobile OS.
The cross platform apps tests and validates simple concepts, needs a promotional application of limited lifespan, has a simple user interface, does not interact with any device hardware, and does not process complex data or work with audio and video. The primary target is one OS and you do not need a specific user interface.
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