Not affiliated in any way with Actual Budget, but I can’t recommend it enough. It’s the FOSS version of YNAB pretty much so if you’re a fan of envelope budgeting it’s a great tool. I’d even say it has quite a few other strengths compared to YNAB (free bank syncing in the EU with more banks supported for example), and you can always be sure that your financial data stays within your reach.
It varies by bank but for all mine you have to use the username and password unfortunately. My understanding is that it’s just how the underlying bank APIs work in general, because that’s what I have to do when I link accounts for my banks elsewhere too, not just in SimpleFIN. I don’t think they actually store your credentials though, I think it proxies it to the bank login and then caches a token. You can probably ask their support about the details if you’re concerned, they have been pretty responsive to me and willing to answer technical questions.
It does support investment accounts, I have my retirement and investment accounts in there. It supports just about every account I have, actually, credit cards included which is super handy. I think it’s all read-only access through, so you can only use it to import data not make new transactions.
That’s alright. Even read-only access is useful. I could write a script that pulls my current investments, prompts for the amount I’ll be investing in total, and prints out the buys (eg “buy 10 x VOO, 5 x VXF, 20 x VXUS”) that’ll keep the account balanced based on some percentages.
Not sure if it tracks like your actual portfolio breakdown, it might have access to that info but for Actual Budget it just shows the balance on the account.