Welcome to the boards!!
AIMing BTC - I would think there would be too much volatility even for AIM. You would almost have to track BTC intraday; not something AIM was intending to do. It would be an interesting test experiment. Then, there would be the difficulty in actually buying and selling. The fees aren't cheap either. This would have to be taken into account as well. I would ask though, is your intent to treat BTC as a security or as currency(BTC pegged to USD)? For example, Would you AIM the Euro pegged to the GBP? Basically, it comes down to your risk tolerance.
There are several variations of spreadsheets developed and used by members of this board. Most here suggest using the spreadsheet to learn how AIM works.
There is a calculator pinned at the top of the boards which can help, but, no web app per se. You may find a program or two out there, just not web based as far as I know.
My thoughts are my own.
