Not the same, but actual budget (https://actualbudget.org) is self-hosted and does a great job

Open Source accounting software is one thing. Open Source that can automatically download and synchronize the transactions from all your bank accounts is very much another. In theory, there's a standardized file format and your bank(s) should expose an API to access it, but in practice it seems like banks really don't care about working with anybody smaller than Intuit and figuring out how to configure the connection for each bank is a software engineering task in and of itself.

Even Monarch Money (which seems to be the closest thing to a 1-to-1 replacement for Mint, since it's made by the original Mint developers) outsources the problem to several different "data providers" (e.g. Plaid, Finicity, MX) instead of trying to solve it in-house.

(All of the above applies to the US and maybe Canada. Europe is apparently entirely different (better?) in terms of standardization.)

By the way, GNUCash claims to be able to download using OFX, although I haven't had much success with it: https://wiki.gnucash.org/wiki/Setting_up_OFXDirectConnect

If you are comfortable with the command line hledger is a great program which has good tools for importing .csv files from banks and other financial companies.

I use beancount and fava with some custom importers for certain bank statement exports. There are some smart importers that are supposed to auto assign categories but I haven't tried them out yet.

Haven't personally started using this yet, but I was looking for the same a while ago. My search came to Firefly iii 🐖

Also comes with an unofficial app: https://apt.izzysoft.de/fdroid/index/apk/com.dreautall.waterflyiii

Been using Gnucash for about 10 years for personal finance and 2 small businesses. Highly recommended!

I've used GNU Cash with mixed results. It's a little complicated but it might do what you need https://www.gnucash.org/

Just downloaded Denaro today and I'm loving it. Also found out when I downloaded my bank transactions that's I've been spending almost all that I've earned. This year will be better hopefully now that I can see it graphed out

I use Homebank, it is mature and really nice. It took me a little bit of time to get used to but once set up it is truely awesome. Crazy good even. Config/data is plain text which is a big thumbs up in my book. I use git to track changes/keep history and to enable me to use it on more than one machine. https://www.gethomebank.org/en/

If you're only interested in expenses, debts, loans, budget, and statistics, then Keizai is maybe something for you? Transactions is maybe on its way to the pile of features, too.

KMyMoney

I'm not sure if it will suit your needs, but I love Eqonomize!. I can use it from any of my computers by putting its data file on my NAS.

Edit: forgot the URL... https://eqonomize.github.io/

I use MoneyManagerEx after looking at alternativeto.net for Mint. It has an Android app in addition to desktop apps, and has an easy interface, compatible with multiple formats