Thank you! Both Tinkerstellar and Juno embed a Python interpreter built for iOS from CPython, no WebAssembly.

As per what people use Juno for — great question! I think it's a combination of both, but leaning towards learning (hence I had an idea to launch Tinkerstellar). The hardware is somewhat limiting, but I think it's the iPadOS that is the primary limiting factor here. That said, according to feedback I hear Juno is still great for prototyping and drafting something quickly, not just for learning — and some people absolutely do use it for serious work.