Vitally....

App is actually correct for all but the OS.

The word app has been around forever, first appearing in the 1970s (according to some dictionaries I just googled). Pendulum swung towards “programs” and we have since swung back to the correct term.

The braces are nice touch.

I think both are fine. Regular people don't need more than "app", but professionals still know and use other words too.

In my workplace they use robot for everything

Double plus good!

thing and stuff