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The phrase "a killer app" is correct and usable in written English.
It is typically used to refer to a software application that is so useful or innovative that it drives sales of the technology it runs on.
Example: "The new photo editing software is a killer app that has attracted many users to the platform."
Alternatives: "game-changing application" or "must-have software".
Exact(60)
A killer app.
Glass lacks a killer app.
How's that for a killer app?
This is not a killer app".
But now we need a killer app".
"A PC veiled behind a killer app: video games".
What virtual reality needs, experts say, is a killer app.
Third, there is not yet a "killer app" that proves their usefulness in people's daily lives.
VR is still emerging technology, and searching for a "killer app".
Each service is looking for its version of a killer app.
If that's not a killer app, I haven't seen one recently.
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