A viral app called Neon, which offers to record your phone calls and pay you for the audio so it can sell that data to AI companies, has rapidly risen to the ranks of the top-five free iPhone apps since its launch last week.

The app already has thousands of users and was downloaded 75,000 times yesterday alone, according to app intelligence provider Appfigures. Neon pitches itself as a way for users to make by providing call recordings that help train, improve, and test AI models.

But now Neon has gone offline, at least for now, after a security flaw allowed anyone to access the phone numbers, call recordings, and transcripts of any other user, TechCrunch can now report.

TechCrunch discovered the security flaw during a short test of the app on Thursday. We alerted the app’s founder, A

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