Ask HN: Recommended financial modeling tools for founders?

Hey there, this is such a common problem I have to assume there are some good "new school" startup style SaaS companies that are good at financial modeling and projection, for managerial accounting. I'm a startup founder and I want to model projected/actual P&L statement, statement of cashflows, and so on. I use Quickbooks Online, and I have a bookkeeper and accountant, but am wondering what other software type tools people are using these days to get more sophisticated understanding of their numbers.