Ask HN: What do you use for managing personal finance/money?

I'm looking for a tool to manage my personal finances. Something that lets me keep track of money coming in and money going out, possibly in a decently detailed way.

The idea is to keep track of mainly my taxes, knowing at any moment how much I owe and how much I have as "usable" money. But since taxes can just be seen as an expense, this can be generalized and include also all other expenses. I would like to be able to track my outlay and earnings in categories divided by date (e.g. 2017-05-13, fuel, 30EUR). Ideally, I would also like to be able to extract reports based on the metric I prefer (e.g. Give me the total amount of money gone in taxes in this given period).

What do you use for this job, if you use anything at all? I'm curious to hear about how you tackle this problem even if you don't use a particular tool but, say, a spreadsheet synced somehow.

The ideal tool would be cross platform (Android/Linux/Windows), work offline, and -- I realize this is highly unlikely -- possibly with an eye to privacy.