Red dot next to app title?

If to believe to other answers here, there might be several reasons for this red dot.

In my case, the reason appears in TestFlight's docs:

How will I know which apps on my device are beta apps?
Beta apps will be indicated with an orange dot next to the app name on your device.

Got a lead for finding this thanks to Ashish's comment to one of the answers here.

I got the Actual Solution for this problem it is due to provisioning Profile. if you are using live app provisioning profile in your app Build setting , change it and after that you will never see that orange circle.