Does actual support tracking assets in different currencies and split transactions? I'm hacking together a tool for myself that fits my needs, but I'd really be in the market for something that could replace gnucash or beancount for me

I am also hacking my own tool together for exactly this reason - multi-currency is one of those things that is absolutely essential if you need it, but is often ignored by a lot of these solutions.

Check out this amazing article that helped me: https://www.mathstat.dal.ca/~selinger/accounting/tutorial.ht...

Last I checked it didn't even have a notion of currency, let alone multiple currencies.

Yep. The Transaction type has just an amount field: https://github.com/actualbudget/actual/blob/master/packages%...

I've been using this as a replacement for YNAB and I don't miss anything. After evaluating Firefly for six months, I would say its setup isn't easy.

How easy is it to move data from YNAB to this? i.e. transactions, categories and accounts?

It seems straightforward: https://actualbudget.com/docs/overview/migrating-from-other-...

I just start fresh from start.