Multi-platform app search
It's crossed my mind before, but are there any websites (or apps even) that support search across all major platforms?
For example, I use a Nexus 5 and iPad Air and often prefer to buy an app that support both platforms. If I was looking for a brand new application for a certain function, it would be cool and convenient to be able to search one place and find all multi-platform applications. Knicket does allow you to search across all different markets, but you can only search one market at a time.
What I'm looking for is the ability to search for a certain app or type of app and select the OS/devices I want support for and for it to populate a list of only the apps that are on the platforms I selected.
Is there any such thing?