You shouldn't even need to run an "app".
A phone is no different from a laptop, except that it is smaller and the mouse/keyboard are part of the screen. On my phone, I should be able to:
* Open an IDE and write some code.
* Compile my code (depending on the language).
* Run my code.
The whole concept of "app stores" is absurd. In 10 years, will we be denied sudo rights on our laptops? Will we need to pay a 30% cut to Apple for every program that we install, plus $99/yr if we want the privilege of building code for our own device?