18 ms·

Here it is in a book from 1995: http://books.google.com/books?id=JSnOPYKwwtQC&lpg=PA350&dq=killer%20app&pg=PA284#v=onepage&q=killer%20app&f=false http://books.g

• _delirium 15y ago
  Google Books also has a lot of uses in the early 1990s of the phrases "Windows apps", "Mac apps", "DOS apps", and "Unix apps". They appear to be used in a way that's pretty similar to how the terms "iPhone apps" or "Android apps" are used today.