So this is a weird request, but if you can, would there be any way to get this as a website.

I would love to practice in front of my TV, which is pretty easy once I plug my laptop into my television. It's doable on Android, but it's not really an ideal use case

Technically the framework I'm using (flutter) is cross platform so I guess it could be possible but I'm affraid a few of the libs I use such as the ones for the audio are not and either way it would still need some adaptation to work well.

Not entirely impossible that I do it in the future but clearly not at the top of my list for the moment sorry!

Ya Flutter !

Are the accounts cross platform. Can I buy it on Android and use it on iOS

You definitely can yes :)

I'm using RevenueCat for purchases and it also handles all the cross platform stuff

Hence why it could also technically work on the web with the same credentials but as I said, that's a story for another day...