Visicalc was available only on the Apple II for about the first year it existed. Businessmen would go into the fledgling new Personal Computer shops and say "Can you sell me a Visicalc."
That was actually the origin of Apple's initial success as a company: the exclusive marketing deal with Visicalc. Anything else about the 'origins of Apple' is a myth. They're really lucky they were able to get past that, because when Visicalc became available on the new IBM PC nobody wanted Apple hardware anymore.