One of the first recognized examples of a killer application is generally agreed to be the VisiCalc spreadsheet for the Apple II series. Because it was not available on other computers for 12 months, people spent $100 for the software first, then $2,000 to $10,000 on the Apple computer they needed to run it. "BYTE" wrote in 1980, "VisiCalc is the first program available on a microcomputer that has been responsible for sales of entire systems", while "Creative Computing"s VisiCalc review was subtitled "reason enough for owning a computer". Others also chose to develop software, such as EasyWriter, for the Apple II first because of its increasing sales.