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Discover Ludwig"killer app" is a correct and usable part of a sentence in written English.
It is an informal term used to describe a software application that is so popular and successful that it causes a significant rise in sales of the product it is associated with. For example: "The new iPhone's killer app drove sales of the device through the roof."
Dictionary
killer app
noun
A killer application.
Exact(58)
Genetics + Nickelodeon = killer app.
A killer app.
Whither dentistry's killer app?
News is the killer app.
Glass lacks a killer app.
"Killer app?" You are clueless.
Surely this is the killer app.
Back then, hyperlinks were the killer app.
How's that for a killer app?
Death was early American photography's killer app.
Koch calls bicycles the island's "killer app".
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