"VisiCalc"@en . . . . . . . . . . . . . . . "VisiCalc Advanced Version" . "VisiCalc (for \"visible calculator\") was the first spreadsheet computer program for personal computers, originally released for the Apple II. It is often considered the application that turned the microcomputer from a hobby for computer enthusiasts into a serious business tool, and is considered the Apple II's killer app."@en .