Math Ladder AI runs in any current browser on a laptop, tablet or phone. There is nothing to install.
On a tablet or phone you can add it to the home screen and it opens full-screen like an app, keeping you signed in.
A larger screen genuinely helps for timed mock exams, where figures and answer choices are laid out the way the real test lays them out.
Did this answer it? If not, the Help button in the bottom-right corner of any page reaches a person, signed in or not.