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Discover LudwigThe phrase "killer application" is correct and can be used in written English.
It is used to refer to any software or program that has become especially popular or successful. For example, "The video game Fortnite has become a killer application and is now played by millions of people."
Dictionary
killer application
noun
A technological product that is so good, or so innovatory, that it is irresistible to potential customers; especially a software product that persuades people to buy the hardware needed to use it
Exact(60)
It's the killer application.
One has just created the ultimate killer application.
The killer application was the world-beating opportunity.
"The industry is desperately searching for a killer application".
The next "killer application" could be just around the corner.
The pressure-sensitive screen is interesting on paper, but in practice has no killer application.
A killer application is one that makes the adoption of a technology a no-brainer.
"What is the killer application for VR? Again, it's too early to say.
"Now that would be the killer application," replies Just's colleague, computer scientist Tom Mitchell.
Internet access is the killer application for phones, just as it was for the computer.
4. Modern science: According to Ferguson, modern medicine was the west's "most remarkable killer application".
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com