Killer application
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Killer application

A killer application (often shortened to killer app) is any software that is so necessary or desirable that it proves the core value of some larger technology, such as its host computer hardware, software platform, or operating system. Consumers would buy the host platform just to access that application, possibly substantially increasing sales of its host platform.

One mark of a good computer is the appearance of a piece of software specifically written for that machine that does something that, for a while at least, can only be done on that machine.

— Steven Levy, 1985

The earliest recorded use of the term "killer app" in print is in the May 24, 1988 issue of PC Week: "Everybody has only one killer application. The secretary has a word processor. The manager has a spreadsheet."

The definition of "killer app" came up during the deposition of Bill Gates in the United States v. Microsoft Corp. antitrust case. He had written an email in which he described Internet Explorer as a killer app. In the questioning, he said that the term meant "a popular application," and did not connote an application that would fuel sales of a larger product or one that would supplant its competition, as the Microsoft Computer Dictionary defined it.

Introducing the iPhone in 2007, Steve Jobs said that "the killer app is making calls". Reviewing the iPhone's first decade, David Pierce for Wired wrote that although Jobs prioritized a good experience making calls in the phone's development, other features of the phone soon became more important, such as its data connectivity and the later ability to install third-party software.

The World Wide Web (through the web browsers Mosaic and Netscape Navigator) is the killer app that popularized the Internet, as is the music sharing program Napster.

Although the term was coined in the late 1980s one of the first retroactively recognized examples of a killer application is the VisiCalc spreadsheet, released in 1979 for the Apple II. Because it was not released for other computers for 12 months, people spent US$100 (equivalent to $400 in 2024) for the software first, then $2,000 to $10,000 (equivalent to $9,000 to $43,000) on the requisite Apple II. BYTE wrote in 1980, "VisiCalc is the first program available on a microcomputer that has been responsible for sales of entire systems", and Creative Computing's VisiCalc review is subtitled "reason enough for owning a computer". Others also chose to develop software, such as EasyWriter, for the Apple II first because of its higher sales, helping Apple defeat rivals Commodore International and Tandy Corporation.

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