AIUI that is wrong in USA and UK (don't know about other countries). At least if using the "non-commercial" definition used in IP law.
For example, you create an advert for free for an event that charges money, that's commercial. You give stuff away that impacts someone else's ability to sell, that's commercial. You do a free event, charge for snacks, it's a commercial event.
Use an app privately the results of which you use to benefit your employer, that's a commercial use.
It's pretty hard to answer the general question for "an app" rather than a specific app and associated action.
