An interesting blog post describing how to run basic Hartree-Fock Quantum Chemistry code on an iPhone.

They used a python version of mobihf, there are a number of Python interpreters for iOS but they had success with pythoni and they note:

This is surprisingly well written app with custom keyboard shortcuts and well made editor for editing Python scripts. It is worth buying the pro features in this app if you do a lot of Python programming on the move.

They also used Sketch Python and found that it gave improved performance.

The work was undertaken on the A7 processor of iPhone 5s, and it would be interesting to see the performance on one of the latest iOS devices.

But I can say that these mobile processors have reached the performance levels of the most desktop processors for all practical purposes.