Triggering scripts remotely

Device, Routerboard 2011UiAS-2HnD

I have some scripts that I would like to be able to be triggered remotely, from within my local network.

I’m surprised that option to create buttons on the Mikrotik App doesn’t already exist.
Is there anyway by going to a web address, or some other meccanism that would work on Windows as well as Android?

Without having to buy an external App.

You can use a scheduled script that uses /tools fetch to get some information. If the information on the web page changes, do some other in the script.

See Return value to a variable here:
https://wiki.mikrotik.com/wiki/Manual:Tools/Fetch#Return_value_to_a_variable