How to create a hidden mobile app for employees only?

Question

Android

I'm still exploring how this is possible and whether it is possible.
I am familiar with mobile development in so far as.
But I will write the necessary application.
A tracker for drivers to send once a minute the geolocation in the background to a specific address.
Question: how to make it so that not everyone can download it and install it for themselves?
That is, a highly specialized application, but in order to put it on IOS and Android, you need to put it in the playmarket, and what about for general viewing? There are no other options?.

Answer 1

On iOS - TestFlight or b2b , on Android - Google Play Beta.

Answer 2

Well, in the case of android, this is not a problem at all, no one forbade apk files, or so .
For iOS, Apple has a $special offer to that effect.

Answer 3

About iOS: Look here if you speak English:
Private iOS app
I once used the Ad Hoc c over-the-air option (the file with the application was at the link).
By the way, study in more detail the possibility of background work of iOS applications.

Answer 4

I will answer on android.
There is experience in distributing the application without google play.
You can initially upload the apk to any file sharing service and distribute the download link. There are no problems.
But to update you will have to make your own mechanism. In principle, everything is also simple here. Upload your apk somewhere and download it in the application. Android allows you to immediately install it. Those. your application is being replaced. The main difficulties may arise with the correction of errors. Therefore, consider in advance how you will do this.