For examples look at the search hits in https://archive.org/stream/1981-03-compute-magazine/Compute_....
I wouldn't call this an application, though.
"App" is completely wrong, as it was introduced by Apple for user-facing programs running on a mobile phone (if Android had been the OS popularizing this, Google would have picked the first three letters of its company name as the new name for these things, and every web site would have a banner "install our goo" :-))
We've been calling applications "apps" for going on thirty years at a minimum.
As others have pointed out, it was also used as the file extension for "application programs" on NeXTStep (.app). It continued to OS X which is where "App" came from for iOS applications. It has nothing to do with the name "Apple".
These were school or home computers.
Picture under RISC OS 3: https://en.wikipedia.org/wiki/History_of_RISC_OS